SynopsisThe crosslinking of poly(viny1 chloride) in the presence of zinc oxide, magnesium oxide, ethylenethiourea (ETU), tetramethylthiuramdulfide (TMTD), and sulfur at 160 and 180°C has been studied. The effects of ETU and sulfur on the crosslinking of PVC in the presence of TMTD have been individually studied. It has been found that zinc dimethyldithiocarbamate (ZnDMDC) is the actual crosslinking agent and heat stabilizer of PVC, formed in the cured polymer mix.
Chemical Structure and Thermal Stability of Poly(viny1 Chloride)The field of investigation of the chemical structure and thermal stability of PVC is at present so wide that we can give here only a short survey of the
SynopsisHeat and mechanical stressing at higher temperatures effect changes in polychloroprene rubber leading to network formation. During thermovulcanization of polychloroprene rubber in the temperature range of 15O-2OO0C, two reactions have been observed and their kinetic parameters determined. When the rubber is stressed by shearing forces, the rate of degradation crosslinking is fairly high even at relatively low temperatures (90-150°C). Thermovulcanization of polychloroprene rubber/poly(vinyl chloride) blends has been investigated in the entire concentration range at 180°C. Maxima have been observed on the dependences of some kinetic parameters of the thermovulcanization reaction on polymer blend composition.
J a r o s 1 . a~ B o t u t a , M i r o s l a v M h a lSunifMARYThe e f f e c t of crushed rubber powder as a f i l l e r of r u b b e r compounds on t h e ozone aging of v u l c a n i z a t e s has been i n v e s t igated. It has been shown t h a t t h e ozone r e s i s t a n c e depends s i gn i f i c a n t l y both on t h e c o n c e n t r a t i o n and t h e d e g r a d a t i o n degree of t h e d i s p e r s e d phase. R e s u l t s of l a b o r a t o r y and atmospheric a g i n g t e s t s a r e summarized. The r e s u l t s obtained enable t h e assessment of d i f f e r e n c e s o f 1 Paper p r e s e n t e d a t t h e l g t h Colloquium o f Danubian Countries on "Atmospheric Aging and S t a b i l i z a t i o n of Polymers" i n Praque (Czechoslovakia), J u l y 24 -29, 1989 GI 1990 Hiithig & WepfVerlag, Basel 000>3146/90/%03.00
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