摘要
用孟山都流变仪测定了三元乙丙橡胶在１８０，１７０，１６０，１５０，１４０℃下的硫化曲线。转矩变化呈平坦型。用单分子反应速度方程处理曲线变化，反应级数ｎ的确定用尝试法，其准则为：ｎ精确估计到小数点后２位时，使Ｉ＝∑∑（Ｐ－Ｐ）２最小。在试验的温度范围内反应机理相同，测得ｎ＝０．７５，硫化温度系数为２．４７～２．８３。用得到的模型计算的转矩变化的理论值与试验值吻合良好。
The vulcanization curves of EPDM were determined by Monsanto rheometer at 180℃,170℃,160℃,150℃ and 140℃.The change of rotative moment P was smooth type.The changes of P could be expressed by the speed equation of monomolecular reaction.Reaction order n was estimated by trial-and-error method. The criterion was to make I =∑∑(P-P)2 minimized when n was obtained accurately the second decimal place.The determined n was 0.75 and vulcanization temperature coefficients are in the range of 2.47～2.83 when the reaction mechanism was same in the temperature range of test.The changes of P calculated by the obtained model were in good agreement with the experimental values.
出处
《合成橡胶工业》
CAS
CSCD
1997年第2期108-111,共4页
China Synthetic Rubber Industry
关键词
三元乙丙橡胶
硫化曲线
数学模型
硫化
橡胶
ethylene propylene diene monomer
vulcanization curve
mathematical model
reaction kinetics
vulcanization temperature coefficient
