S. Kawahara et Y. Tanaka, PLASTICIZATION AND CRYSTALLIZATION OF CIS-1,4 POLYISOPRENE MIXED WITHMETHYL LINOLATE, Journal of polymer science. Part B, Polymer physics, 33(5), 1995, pp. 753-758
Crystallization behavior of synthetic cis-1,4 polyisoprene mixed with
methyl linolate was investigated by differential scanning calorimetry
and dilatometry. At isothermal crystallization temperature of -25 degr
ees C, a rate of crystallization decreased with the addition of 1 wt %
methyl linolate, whereas it increased with a large amount of methyl l
inolate, about 30% by weight. Although Avrami constant of cis-1,4 poly
isoprene was 2.82, that of mixtures containing 1 and 30 wt % methyl li
nolate was found to be approximately 4. This implies the same crystall
ization mechanism was in operation in the mixtures. Since glass transi
tion temperature, T-g, of cis-1,4 polyisoprene decreased as the methyl
linolate content of mixture increased, methyl linolate was found to b
e plasticizer for cis-1,4 polyisoprene. The increase in the rate of cr
ystallization in the mixtures was corresponding to the decrease in T-g
. (C) 1995 John Wiley and Sons, Inc.