Month: November 2022

Kot, David published the artcilePorous graphite as stationary phase for the chromatographic separation of polymer additives – determination of adsorption capability by Raman spectroscopy and physisorption, Related Products of piperidines, the main research area is porous graphite stationary phase chromatog separation polymer additive antioxidant; adsorption capability Raman spectroscopy physisorption polyolefin light stabilizer; Adsorption potential distributions; Brunauer emmett teller (BET) method; HPLC of polymer additives; Polyolefins; Porous graphitic carbon; Raman spectroscopy.

Additives are added to polymers in small concentration to achieve desired application properties widely used to tailor the properties. The rapid diversification of their mol. structures, with often only minute differences, necessitates the development of adequate chromatog. techniques. While modified silica so far is the workhorse as stationary phase we have probed the potential of porous graphitic carbon (HypercarbTM) for this purpose. The results show that the multitude of physicochem. interactions between analyte mols. and the graphitic surface enables separations of polyolefin stabilizers with unprecedented selectivity. To support the chromatog. results the adsorption capability of HypercarbTM for selected antioxidants and UV absorbers was determined by Raman spectroscopy and argon physisorption measurements. The shift of the Graphite-band in the Raman spectra of HypercarbTM upon infusion with additives correlates with the changes in the Adsorption Potential Distributions. The results of argon physisorption measurements go hand in hand with the chronol. of desorption of the additives in liquid chromatog. experiments The elution sequence can be explained by van der Waals or London forces, π-π-interactions and electron lone pair donor-acceptor interactions between the graphite surface and analyte functional groups.

Journal of Chromatography A published new progress about Antioxidants. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Related Products of piperidines.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Zhang, Xi published the artcileDielectric Properties of Biaxially Oriented Polypropylene Nanocomposites Prepared Based on Reactor Granule Technology, COA of Formula: C28H52N2O4, the main research area is dielec biaxially oriented polypropylene nanocomposite reactor granule technol.

The addition of inorganic nanoparticles is one of the most widely studied strategies to improve dielec. properties of thin film capacitors, but its application to biaxially oriented polypropylene (BOPP) has rarely been reported due to the difficulty of stretching without break. Here, we have investigated dielec. properties of BOPP/TiO2 nanocomposites prepared by a reactor granule technol., in which precursors impregnated in the pores of PP reactor granule are converted into highly dispersed oxide nanoparticles during melt mixing. The permittivity of the nanocomposites was greatly enhanced beyond classical mixing rules by the addition of a small amount of TiO2 nanoparticles (1-5 wt %), and the enhancement was very sensitive to the stretching ratio. A critical role of the interphase region was suggested. The AC breakdown voltage (BDV) of the BOPP/TiO2 nanocomposites decreased sharply with respect to the amount of TiO2 added. The detailed anal. suggested the roughening of the film surface around the nanoparticles due to stretching as the main cause of the BDV reduction

ACS Applied Electronic Materials published new progress about Antioxidants. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, COA of Formula: C28H52N2O4.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Pillay, M. Krishna published the artcileConformational analysis of heterocyclic systems: part-III conformational analysis of substituted N-acetypiperidin-4-ones, Computed Properties of 5773-58-0, the main research area is acetypiperidinone conformational analysis NMR.

The conformations of various substituted N-acetylpiperidin-4-ones have been analyzed by IR, 1H NMR and 13C NMR data. On the basis of these results, acetyl group adopting a coplanar orientation with the dynamically averaged plane of the ring is proposed. The energy barrier ΔG# for the rotation of the acetyl group has been evaluated.

Indian Journal of Heterocyclic Chemistry published new progress about Acetyl group. 5773-58-0 belongs to class piperidines, name is 3-Methylpiperidin-4-one, and the molecular formula is C6H11NO, Computed Properties of 5773-58-0.

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

Serrano, Catherine M. published the artcileUnifying the Aminohexopyranose- and Peptidyl-Nucleoside Antibiotics: Implications for Antibiotic Design, Safety of tert-Butyl piperidin-4-ylcarbamate, the main research area is tuberculosis antiretroviral amicetin prokaryotic translation inhibitor; amicetin; antibiotic; blasticdin S; ribosome; translation inhibitor.

In search of new anti-tuberculars compatible with anti-retroviral therapy we re-identified amicetin as a lead compound Amicetin’s binding to the 70S ribosomal subunit of Thermus thermophilus (Tth) has been unambiguously determined by crystallog. and reveals it to occupy the peptidyl transferase center P-site of the ribosome. The amicetin binding site overlaps significantly with that of the well-known protein synthesis inhibitor balsticidin S. Amicetin, however, is the first compound structurally characterized to bind to the P-site with demonstrated selectivity for the inhibition of prokaryotic translation. The natural product-ribosome structure enabled the synthesis of simplified analogs that retained both potency and selectivity for the inhibition of prokaryotic translation.

Angewandte Chemie, International Edition published new progress about 70S ribosome. 73874-95-0 belongs to class piperidines, name is tert-Butyl piperidin-4-ylcarbamate, and the molecular formula is C10H20N2O2, Safety of tert-Butyl piperidin-4-ylcarbamate.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Valenta, Vladimir published the artcilePotential neuroleptics of the orthopramide series; synthesis of heterocyclic 5-amino-2-methoxybenzamides and of some related compounds, Name: 1-Benzylpiperidin-4-amine dihydrochloride, the main research area is neuroleptic aminomethoxybenzamide heterocyclic preparation.

Condensation of 2,5-MeO(O2N)C6H3COCl with heterocyclic amines and hydrazines gave the title derivatives I (R = NO2, n = 0, 1) and II (R = NO2; Z = NH, X = CH, N; Z = bond, X = N). Reduction of I and II (R = NO2) with Raney Ni gave amino derivatives I and II (R = NH2). I (R = NHMe, n = 1) and II (R = NHMe, Z = NH, X = CH) were prepared via tosyl derivatives All prepared compounds I and II were tested as potential neuroleptics. Only compounds II (Z = NH, X = CH) show mild activity.

Collection of Czechoslovak Chemical Communications published new progress about Tranquilizers. 1205-72-7 belongs to class piperidines, name is 1-Benzylpiperidin-4-amine dihydrochloride, and the molecular formula is C12H20Cl2N2, Name: 1-Benzylpiperidin-4-amine dihydrochloride.

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Sharma, Pankaj published the artcileOne-Pot Synthesis of Substituted Piperidinones and 3,4-Dihydropyrimidinones Using a Highly Active and Recyclable Supported Ionic Liquid Phase Organocatalyst, Product Details of C6H11NO, the main research area is piperidinone dihydropyrimidinone preparation silica supported ionic liquid organocatalyst.

1-Ethyl-3-methylimidazolium Et sulfate was synthesized and its supported ionic liquid phase form was prepared and used as an organocatalyst for the synthesis of substituted piperidinones and 3,4-dihydropyrimidinones. The ionic liquid was characterized by 1H NMR, 13C NMR, and mass spectrometry. The catalyst is novel, stable, completely heterogeneous, and recyclable for several times and can be easily recovered by filtration. It was characterized with SEM, TEM, TGA, and energy-dispersive x-ray spectroscopy techniques. The workup procedures are very simple, and products were obtained in good-to-excellent yields with reasonable purities without the need for further chromatog. purification

Australian Journal of Chemistry published new progress about Ionic liquids. 5773-58-0 belongs to class piperidines, name is 3-Methylpiperidin-4-one, and the molecular formula is C6H11NO, Product Details of C6H11NO.

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

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

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