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Effect of an anisodiometric particle filler upon the polymer properties
Abstracts
199
PREPARATION OF POLYMERS BY THE THERMAL DEHYDROPOLYMERIZATION OF HYDROCARBONS
V. V. K o r s h a k , S. L . S o s i n N o . 9, 1427, 1961.
and Chzhou
Zhun-pei,
Vysokomol.
soedin.
3:
A METHOD has been proposed for preparing polymers b y the thermal dehydropolymerization of hydrocarbons. LARGE PERIODS IN ENANTHIC FIBERS
A . I . K i t a i g o r o d s k i i , D. Y a . T s v a n k i n a n d Y u . ~I. P e t r o v , V y s o k o m o l . s o e d i n . 3: N o . 9, 1428, 1961. A LOW angle X-radiogram has been obtained of enanthic (polyamide-7) fiber. The X-radiogram is four-pointed with a large period equal to 85A. The angle between the normals to the planes responsible for the low angular reflex and the c axis is a p p r o x i m a t e l y equal to the angle between c a n d the normal to the (001) planes. I t has been suggested t h a t the appearance of a four-point low angle X-radiogram is associated with the presence of a triclinic structure on the polymer.
EFFECT OF AN ANISODIOMETRIC PARTICLE FILLER UPON THE POLYMER PROPERTIES
T . I . S o g o l o v a a n d T. K . M e t e l s k a y a , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 4 2 8 - 1 4 2 9 , 1961. IT has been shown t h a t incorporation of fibrous fillers in an elastic polymer even in relatively low concentrations considerably alters its mechanical properties, increasing the flow temperature a n d strength. The strengthening effect is connected only with changes in the shape of the filler particles.
OXIDATION OF BUTADIENE-NITRILE RUBBERS
E . Y a . D e v i r t s a n d A. S. N o v i k o v , V y s o k o m o l . s o e d i n . 3: N o . 10, 1 4 4 1 - 1 4 4 5 , 1961. THE inhibited oxidation of the butadiene-nitrile rubbers SKN-18, SKN-26, SKN-40 has been investigated a t the stage of the induction period. I t has been found t h a t the oxidation rate is determined chiefly b y the nitrile group content, decreasing with increase in aerylonitrile. The activation energy of the inhibited oxidation reaction was calculated from the Arrhenius equation to be 29-31keal/mole for the S K N rubbers, which is 5keal/mol higher t h a n for SKS-30 and 10kcal/mole higher t h a n for SKB rubbers. The structural transformations of the SKI~ rubbers as the result of inhibited oxidation is determined also b y the nitrile group content. The predominant process a t all stages of oxidation in the case of SKN-26 and SKN-40 rubbers is structuration. I n the case of SKN-18 degradation a t first prevails, b u t a t later stages structuration assumes the leading role. I t has been shown t h a t a correlation exists between the behaviour of SKI~ rubbers towards thermoxidative mastication. The Publisher will be pleased to quote for the supply of a full English translation of a n y papers a b s t r a c t e d in these pages.
199
PREPARATION OF POLYMERS BY THE THERMAL DEHYDROPOLYMERIZATION OF HYDROCARBONS
V. V. K o r s h a k , S. L . S o s i n N o . 9, 1427, 1961.
and Chzhou
Zhun-pei,
Vysokomol.
soedin.
3:
A METHOD has been proposed for preparing polymers b y the thermal dehydropolymerization of hydrocarbons. LARGE PERIODS IN ENANTHIC FIBERS
A . I . K i t a i g o r o d s k i i , D. Y a . T s v a n k i n a n d Y u . ~I. P e t r o v , V y s o k o m o l . s o e d i n . 3: N o . 9, 1428, 1961. A LOW angle X-radiogram has been obtained of enanthic (polyamide-7) fiber. The X-radiogram is four-pointed with a large period equal to 85A. The angle between the normals to the planes responsible for the low angular reflex and the c axis is a p p r o x i m a t e l y equal to the angle between c a n d the normal to the (001) planes. I t has been suggested t h a t the appearance of a four-point low angle X-radiogram is associated with the presence of a triclinic structure on the polymer.
EFFECT OF AN ANISODIOMETRIC PARTICLE FILLER UPON THE POLYMER PROPERTIES
T . I . S o g o l o v a a n d T. K . M e t e l s k a y a , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 4 2 8 - 1 4 2 9 , 1961. IT has been shown t h a t incorporation of fibrous fillers in an elastic polymer even in relatively low concentrations considerably alters its mechanical properties, increasing the flow temperature a n d strength. The strengthening effect is connected only with changes in the shape of the filler particles.
OXIDATION OF BUTADIENE-NITRILE RUBBERS
E . Y a . D e v i r t s a n d A. S. N o v i k o v , V y s o k o m o l . s o e d i n . 3: N o . 10, 1 4 4 1 - 1 4 4 5 , 1961. THE inhibited oxidation of the butadiene-nitrile rubbers SKN-18, SKN-26, SKN-40 has been investigated a t the stage of the induction period. I t has been found t h a t the oxidation rate is determined chiefly b y the nitrile group content, decreasing with increase in aerylonitrile. The activation energy of the inhibited oxidation reaction was calculated from the Arrhenius equation to be 29-31keal/mole for the S K N rubbers, which is 5keal/mol higher t h a n for SKS-30 and 10kcal/mole higher t h a n for SKB rubbers. The structural transformations of the SKI~ rubbers as the result of inhibited oxidation is determined also b y the nitrile group content. The predominant process a t all stages of oxidation in the case of SKN-26 and SKN-40 rubbers is structuration. I n the case of SKN-18 degradation a t first prevails, b u t a t later stages structuration assumes the leading role. I t has been shown t h a t a correlation exists between the behaviour of SKI~ rubbers towards thermoxidative mastication. The Publisher will be pleased to quote for the supply of a full English translation of a n y papers a b s t r a c t e d in these pages.