A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Product Details of 1121-89-7, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1121-89-7, Name is Piperidine-2,6-dione, molecular formula is C5H7NO2. In a Review, authors is Monnerie, Lucien，once mentioned of 1121-89-7
This paper deals with the mechanical properties (plastic deformation, micromechanism of deformation, fracture) of various amorphous polymers: poly(methyl methacrylate) and its maleimide and glutarimide copolymers, bisphenol A (and/or tetramethyl bisphenol A) polycarbonate, and aryl-aliphatic copolyamides. First, the required background on molecular characteristics, micromechanisms of deformation and fracture characterisation is recalled. Then, the results are discussed for each polymer series, considering information obtained on the motions involved in secondary transitions (mostly beta transitions) analysed in a previous paper. The importance of the cooperative motions occurring in the high temperature part of the transition is unambiguously pointed out. Furthermore, in glutarimide copolymers, as well as in aryl-aliphatic copolyamides, it is shown that the dependence of toughness on the entanglement density fails and only the consideration of cooperative a?transition motions can consistently account for the results. Finally, concerning the change of strain softening with increasing temperature, two opposite behaviours are observed for polymers in which beta transitions result, on the one hand from side-group motions (strain softening decreases) and on the other hand from certain main-chain units (strain softening increases). Two different mechanisms have been proposed, based on a softening of the polymer medium by a? transition motions associated with either an intramolecular cooperativity (in the first case), or an intermolecular cooperatively (in the second case) of these motions. Thus, combination of the results of the analysis of the relation of chemical structure to beta transition motions with the present conclusions yields a molecular description of the whole set of behaviours involved in the mechanical properties of amorphous polymers, till fracture. Springer-Verlag Berlin Heidelberg 2005.
Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. I hope my blog about is helpful to your research. Product Details of 1121-89-7
Reference：
Piperidine – Wikipedia,
Piperidine | C5H1204N – PubChem