sigmoid-colon
发表于 2025-3-23 10:00:31
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ADORE
发表于 2025-3-23 17:17:19
Koordinierung des IntermediärstoffwechselsMacromolecular modifiers are used to improve some physical properties, mainly mechanical properties of polymers. They have found wide-spread application in the reduction of basic defects of polymers in their glassy state, mainly their resistance to low-energy impact, and they are used also to modify rheological properties of polymer melts .
1FAWN
发表于 2025-3-23 21:36:23
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安抚
发表于 2025-3-24 00:50:05
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iodides
发表于 2025-3-24 06:19:44
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Barrister
发表于 2025-3-24 09:37:07
Purin- und PyrimidinstoffwechselLight radiation contributes very actively to polymer aging, especially when oxygen is present, which is a normal situation for most plastic materials. For example, when natural rubber is exposed to UV radiation at 45°C, it oxidizes three times as fast as in the dark at 70°C .
改正
发表于 2025-3-24 13:50:29
Purin- und PyrimidinstoffwechselBurning of plastics presents a very serious problem that limits their application as building materials and in automobile and aviation industries, in mines, and so on. Recent disastrous accidents have raised suspicion about them in the mind of prospective users and severe safety regulations have been imposed on the plastics industry.
轻浮女
发表于 2025-3-24 15:47:14
Koordinierung des Intermediärstoffwechselsto improve the properties desired of final products; this is done with minimal or no change of the polymer molecular structure. This definition excludes catalysts, initiators, cross-linking agents, and so on, which bring basic chemical changes to the polymer structure .
Fortuitous
发表于 2025-3-24 22:08:24
Proteinbiosynthese und Proteinmodifikation decreasing the viscosity of polymer melts, the glass transition temperature (..), and the elasticity modulus of finished products. Plasticizers are used only with a limited number of polymers, the most important being poly(vinyl chloride) (PVC) and its copolymers (80% by weight ), cellulose deri
过份艳丽
发表于 2025-3-25 00:02:18
Zelluläre Membranen und Organellenused in the past to facilitate extrusion, injection, compression, etc., of many polymers, mainly PVC, acrylonitrile-butadiene-styrene terpolymer (ABS), PS, PMMA, cellulose acetate (CA), polytetrafluoroethylene (PTFE), and so on. Figure 2.1 shows the relative importance of these polymers as far as th