Abstract - Improving the Low Temperature Resistance of Natural Rubber


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Improving the Low Temperature Resistance of Natural Rubber A series of vulcanized blends of natural rubber (NR) with high vinyl butadiene rubber (BR) have been prepared and these exhibit polymer miscibility, as demonstrated by using a number of techniques, over a broad range of blend compositions. The susceptibility to low temperature crystallization of sulphur cured gum and black-filled blend vulcanisates containing up to 25% high vinyl BR has been determined. In the strained state this has been determined by measuring the loss of stress associated with crystallization and in the unstrained state by measurement of the differential scanning calorimetry melting point endotherm. A number of factors have been shown to influence the resistance of the NR blends to low temperature crystallization. These include high vinyl content of the blend, the nature of the cure system and the presence of carbon black filler. In blend compositions containing less than 20% high vinyl BR content, little significant loss of strain crystallization in NR occurs, as indicated by the retention of both tensile and non-relaxing fatigue properties. The use of such blends where improved resistance to low temperature crystallization is required is discussed.
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