Tag: M.W:400-500

Valentukeviciene, Marina published the artcileFluoride Removal from Groundwater by Technological Process Optimization, Recommanded Product: Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, the main research area is fluoride removal groundwater technol process optimization.

Fluoride removal from aqueous solutions was studied using nanofiltration and sorption techniques which have always been best key ways to deal with water contaminated by fluoride. In this presented work, we were firstly interested on fluoridated rejected water overcoming the drawback of RO membrane process of groundwater treatment plant in Baltic region (Kretinga, Lithuania). Opoka sorbent has shown effective results of fluoride sorption with efficiency higher than 77%. In order to understand the sorption phenomenon and to validate the results obtained, we have applied exptl. data on Freundlich and Langmuir isotherms which allow us to determine isotherms parameters (KF; 1/n and KL; qmax) and to confirm the experiment Because of the unacceptable tariff of drinking water treated by RO, defluoridation with nanofiltration method is proposed in this study as a solution which can replace reverse osmosis technique. For that, tests of nanofiltration for fluoride removal were carried out at laboratory scale by using nanofiltration flat sheet membranes (NF270 and NF90).

Ecological Chemistry and Engineering S published new progress about Adsorption. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Recommanded Product: Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Portela, Raquel published the artcileMonolithic SiC supports with tailored hierarchical porosity for molecularly selective membranes and supported liquid-phase catalysis, Safety of Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, the main research area is silicon carbide monolithic tailored hierarchical porosity liquid phase catalysis.

Monolithic support materials with the mech. resistance and thermal conductivity of SiC as well as tunable surface chem. and textural properties were developed for their use in catalytic membrane reactors. After heat treatment, the extruded SiC monoliths have a monomodal distribution of macropores of a few μm in diameter depending on the particle size of the starting material. A macroporous, defect-free, smoother skin was applied onto the external wall using a solution of sub-micrometer SiC particles. These monoliths with skin could be coated successfully with molecularly selective membranes, and thus have application in membrane reactor processes. Finally, metal oxide nanoparticles were infiltrated into the macropores to modify the surface texture and chem., allowing the immobilization of liquid phase catalysts. The resulting multimodal distribution of pore sizes could be tuned by the choice of SiC and oxide particle sizes, number of wash-coats and calcination temparature. Mesopores created between nanoparticles had diameters of roughly 40% of those of the nanoparticles. Small macropores, between 10-1000 nm, were also created, with bigger size and volume at higher calcination temparatures due to the metal oxide particles contraction. The developed materials were validated as support for PDMS membranes and for continuous gas-phase hydroformylation of 1-butene using Rh-diphosphite catalysts.

Catalysis Today published new progress about Agglomeration. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Safety of Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Shi, Jia published the artcileEvaluation of thermoplastic polyolefin materials for the hard shed of composite insulators, Application of Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, the main research area is polyolefin material hard shed composite insulator hydrophobicity transfer property.

This article explores the possibility of using polyolefin materials for composite insulator sheds. The transfer component (silicone oil or erucamide) is added into a polyolefin material to improve its hydrophobic properties. Results show that the silicone oil-modified polyolefin material (polyolefin-S) exhibited an obvious hydrophobicity transfer property. When the equivalent salt deposit d. and nonsol. deposit d. are 0.1 and 0.5 mg/cm2, resp., the static contact angle increases from 75° to 87° as the silicone oil transfer time increases from 24 to 96 h. Meanwhile, polyolefin-S exhibits high mech. strength, hardness, volume resistivity, and surface resistivity values of 21.4 MPa, 62.6 HD, 1.7 × 1015 Ω m and 1.2 × 1016 Ω, resp. Moreover, polyolefin-S shows excellent tracking and erosion resistance of 4.5 kV level in the inclined plane test. The results verify that the polyolefin material is a promising candidate material for the hard shed of composite insulators.

Journal of Applied Polymer Science published new progress about Contact angle. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Application of Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Davand, Razieh published the artcileTheoretical and experimental assessment of UV resistance of high-density polyethylene: Screening and optimization of hindered amine light stabilizers, Synthetic Route of 52829-07-9, the main research area is hindered amine stabilizer polyethylene UV resistance.

Hindered amine light stabilizers (HALS) are widely used chem. stabilizers for preventing polymer degradation In this study, the effects of type of HALS and its content in high-d. polyethylene (HDPE) over the stabilization process are investigated employing d. functional theory (DFT) and exptl. approach. The electrophilicity index of four types of com. HALS are compared by DFT to select the most effective one. Besides, the HDPE sample containing a phenolic antioxidant and different contents of the selected HALS are exptl. exposed to UV irradiation The effect of HALS content on the changes in chain microstructure and mol. weight of HDPE are evaluated using gel permeation chromatog. and frequency sweep rheometry. In the absence of HALS, HDPE suffers degradation and the phenolic antioxidant causes chain scission. However, by adding HALS, the chain branching and crosslinking mechanisms are predominant. The results of FTIR, DSC, and tensile analyses follow similar trends, revealing that the best stabilization performance corresponds to adding 600 ppm HALS to HDPE.

Journal of Applied Polymer Science published new progress about Crystallinity. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Synthetic Route of 52829-07-9.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Zhang, Xi published the artcileCooperative influences of nanoparticle localization and phase coarsening on thermal conductivity of polypropylene/polyolefin elastomer blends, Recommanded Product: Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, the main research area is polypropylene polyolefin rubber alumina nanocomposite morphol thermal conductivity.

Polypropylene (PP)/polyolefin elastomer (POE)/aluminum oxide (Al2O3) nanocomposites were prepared based on a reactor granule technol. (RGT). The effect of nanoparticle migration and phase morphol. evolution on the formation of thermal conductive networks was systematically studied. The utilization of RGT and POE with high viscosity enabled successful migration of in-situ generated Al2O3 nanoparticles at the interface of PP and POE, as combined results of uniform dispersion of Al2O3 and accompanied small phase domain size of PP [1]. The localization of the nanoparticles at the interface also contributed to suppression of the phase coarsening during annealing. The nanoparticle migration to the interface and the retarded phase coarsening synergistically contributed to the enhanced thermal conductivity

Composites, Part A: Applied Science and Manufacturing published new progress about Heat capacity. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Recommanded Product: Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Chang, Tianying published the artcileTerahertz dielectric spectroscopic analysis of polypropylene aging caused by exposure to ultraviolet radiation, Recommanded Product: Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, the main research area is polypropylene aging UV radiation exposure terahertz dielec spectroscopic analysis; THz dielectric spectroscopy; polypropylene; ultraviolet aging.

Terahertz dielec. spectroscopy is shown to be an effective tool for bench-marking UV aging of polypropylene. In this, thin-film polypropylene samples exposed to standard artificial UV radiation in accelerated aging from 1 day to 30 days are closely monitored by a terahertz time-domain spectroscopy system and analyzed using an effective data processing method. It is found that the terahertz absorption of the polypropylene samples is generally weak and the terahertz dielec. constant varies slightly though discernibly during the aging process, with the refractive index decreasing slightly with increasing length of UV exposure. Nonetheless, the rate of variation of the polypropylene refractive index with increasing terahertz frequency exhibits a drastic inflection around the 15-days aging point and the rate changes suddenly from pos. value to neg. value. Based on this prominent and consistent THz dielec. spectroscopic feature of the aging process, an efficient judging criterion is established to distinguish the early-term, mid-term, and late-term phases as well as the degree of polypropylene UV aging, corresponding to the fundamental transformation of the polymer material from a nonpolar to a polar substance at a critical level of oxidation induced by UV radiation.

Polymers (Basel, Switzerland) published new progress about Absorptivity. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Recommanded Product: Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Takimoto, Ken published the artcileExploring stabilizer formulations for light-induced yellowing of polystyrene by high-throughput experimentation and machine learning, Safety of Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, the main research area is photo induced yellowing inhibition polystyrene stabilizer formulation machine learning.

In this study, a high-throughput exptl. protocol was established for yellowing inhibition of transparent plastics on the basis of solution film casting on microplates and UV/visible (UV/Vis) spectroscopic evaluation using a microplate reader. A combination of the protocol and a genetic algorithm realized a large-scale exploration of stabilizer formulations that consist of com. available hindered amine stabilizers and UV absorbers, etc. The found formulations were highly effective in inhibiting the photo-induced yellowing of polystyrene, compared to the most efficient single stabilizer at the fixed concentration The obtained data, which corresponded to seven years of aging (when sequentially acquired), were analyzed and validated based on decision tree classification, force-directed network visualization, and so on. A formulation design guideline was successfully derived that it is essential to combine as many stabilizers that are complementary and synergistic with each other as possible.

Polymer Degradation and Stability published new progress about Light stabilizers. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Safety of Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Li, Yuchun published the artcileThe synergistic effect between bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate and polysiloxane on the photo-aging resistance and flame retardancy of polypropylene, Computed Properties of 52829-07-9, the main research area is polysiloxane photoaging resistance flame retardancy polypropylene.

The introduction of flame retardants often decreases the UV resistance ability of the photo stabilizer. In this work, the antagonistic effect between APP and a light stabilizer HLAS770 was investigated, and the microencapsulated APP (Si-APP) was prepared by coating ammonium polyphosphate (APP) with polysiloxane. Si-APP was introduced into polypropylene (PP) in association with a light stabilizer bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate (HALS770) to synchronously improve both the photo-aging resistance and flame retardancy. The characterization of surface topog., carbonyl index, and mech. properties demonstrated that the antagonistic effect between APP and HALS770 was eliminated by the presence of polysiloxane. The limiting oxygen index and cone calorimeter test results revealed that the heat and smoke release of aged PP composites containing Si-APP and HALS770 was decreased by 28% and 35% resp., compared with that of the aged control PP sample, which is crucial to the practical application of PP. It was proved that polysiloxane and HALS770 synergistically improved the photo-aging resistance and flame retardancy of PP. It is suggested that this work provides a new strategy for fabricating long-life flame retardant polypropylene composites.

Composites, Part B: Engineering published new progress about Activation energy. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Computed Properties of 52829-07-9.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Wallner, Gernot M. published the artcileComparison of Crosslinking Kinetics of UV-Transparent Ethylene-Vinyl Acetate Copolymer and Polyolefin Elastomer Encapsulants, Formula: C28H52N2O4, the main research area is transparent ethylene vinyl acetate copolymer polyolefin elastomer encapsulant crosslinking; EVA; POE; activation energy; crosslinking kinetics; dynamic mechanical analysis; photovoltaics.

Encapsulants based on ethylene-vinyl acetate copolymers (EVA) or polyolefin elastomers (POE) are essential for glass or photovoltaic module laminates. To improve their multi-functional property profile and their durability, the encapsulants are frequently peroxide crosslinked. The crosslinking kinetics are affected by the macromol. structure and the formulation with stabilizers such as phenolic antioxidants, hindered amine light stabilizers or aromatic UV absorbers. The main objective of this study was to implement temperature-rise and isothermal dynamic mech. anal. (DMA) approaches in torsional mode and to assess and compare the crosslinking kinetics of novel UV-transparent encapsulants based on EVA and POE. The gelation time was evaluated from the crossover of the storage and loss shear modulus. While the investigated EVA and POE encapsulants revealed quite similar activation energy values of 155 kJ/mol, the storage modulus and complex viscosity in the rubbery state were significantly higher for EVA. Moreover, the gelation of the polar EVA grade was about four times faster than for the less polar POE encapsulant. Accordingly, the curing reaction of POE was retarded up to a factor of 1.6 to achieve a progress of crosslinking of 95%. Hence, distinct differences in the crosslinking kinetics of the UV-transparent EVA and POE grades were ascertained, which is highly relevant for the lamination of modules.

Polymers (Basel, Switzerland) published new progress about Activation energy. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Formula: C28H52N2O4.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Le, Chen published the artcileReclaimed water application to vegetation restoration in mining area: determination of water quality standards and optimization of moderate treatment technology, Quality Control of 52829-07-9, the main research area is water quality standard determination vegetation restoration moderate treatment technol.

Water shortage severely restricts vegetation restoration of mining area in the northwest China. Moderate treatment of reclaimed water is essential for improving the local ecol. environment. In this study, relevant water quality standards issued by the states and research results were comprehensively considered to propose a reclaimed water quality standard suitable for vegetation restoration of mining area. The available domestic sewage and mine water was moderately treated by hybrid biol. reactor system and nanofiltration membrane system, resp. The effluent quality meet the requirement of reclaimed water quality standards in this study. This study provides theor. support for vegetation restoration of mining area.

E3S Web of Conferences published new progress about Chemical oxygen demand. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Quality Control of 52829-07-9.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem