The degradation of polymers can be triggered by light, heat or aggressive media. The elemental steps are the loss of stabilizing additives, and finally oxidation and chain scission of the polymer. The current approach of analysis is to mechanically abrase layers and then analyze the individual ...
Degradation of Polymers the breakdown of macromolecules owing to heat, oxygen, moisture, light, penetrating radiation, mechanical stresses, biological agencies (for example, by the action of microorganisms), and other factors. Depending on the agent, the following forms of polymer degradation are disti...
3. impurities in polymers In the two kinds of polymer impurity: (1) a small amount of impurities mixed in the process of the inevitable; (2) additive. Most of the impurities will accelerate the degradation of polymers. (two) external causes: Effects of A. heat, temperature and heat and ...
聚合物稳定与降解(Polymer stability and degradation).doc,聚合物稳定与降解(Polymer stability and degradation) The first chapter, the introduction 1. The concept of aging (degradation) In the process of processing, storage and use of polymer materials,
聚合物稳定与降解(Polymerstabilityanddegradation) Thefirstchapter,theintroduction 1.Theconceptofaging(degradation) Intheprocessofprocessing,storageanduseofpolymer materials,thephysicalandmechanicalpropertieswill graduallydeteriorate,whichiscalledaging,ordegradation. p1 Features: Inevitably,irreversibleprocesses. Thetime...
Sometimes, a degradation of polymers by the MALDI laser itself (during the ionization/desorption process) can be observed as well. This could shift molecular masses toward lower values and produce molecular mass distributions that are not representative of the sample as a whole. Often, a change ...
The biodegradation process is modelled u... Y Wang,J Pan,X Han,... - 《Biomaterials》 被引量: 124发表: 2008年 The effect of ionic electrolytes on hydrolytic degradation of biodegradable polymers: Mechanical and thermodynamic properties and molecular modeling The purpose of this study was to ...
MUP degradation is also useful for the determination of fillers in a crosslinked polymer matrix. The degradation to soluble polymers is sufficient here. The example under consideration is determination of carbon black in vulcanizates of natural rubber. 展开 ...
The aim of this review is to present a coherent treatment of the fundamental aspects of the science that underpins current technological practices, and future advances, in the stabilisation of synthetic organic polymers. Aspects of polymer oxidation are introduced first before discussing the role of ...
The molecular weights of polymers, the morphologies of polymer blends and nanocomposites, the chemical bonds and the crystalline structures of polymers are analyzed before and during the degradation process. CNTs promote the degradation of PLA/PEO blends and the conductivity of all samples improves ...