过氧化二异丙苯(DCP)交联聚乙烯的非等温结晶动力学研究.pdf

化学世界
2010年
过氧化二异丙苯(DCP)交联聚乙烯的非等温结晶动力学研究
肖明宇,王芹2,陈大俊2
(1.上海新上化高分子材料有限公司,上海2000902,东华大学纤维材料改性国家重点实验室,材料科学与工程学院,上海201620)
摘要:采用扩散的方法,在低于PE熔点的温度下,使过氧化二异丙苯(DCP)均匀扩散进入PE切
片内部,并在180C交联0.5h得到交联PE。通过DSC测试对其结晶行为及其非等温结晶动力学
进行了研究,研究表明,DCP交联对PE的结晶行为影响较大,与纯PE相比,在DCP用量较低时,
交联PE的结晶峰向低温方向移动,结晶温度随着DCP用量的增加而降低,但继鉷增加DCP的用
量,结晶温度反而会增加;纯PE及交联PE的结晶温度 Avrami指数m介于3.2~4.2之间,DCP
用量較低时,随着DCP含量的增加而增加,n星增长趋势,继续增加DCP含量,m反而降低,交联
PE的結晶速率常数Zc与n呈相同变化趋势。
关键词:过氧化二异丙苯;交联聚乙;非等温结晶动力学
中阳分类号:O632.12
文献标志码:A
文章编号:0367-6358(2010)01-0018-04
Non-isothermal Crystallization Kinetics of Dicumyl Peroxide
DCP) Cross-linked Polyethylenes
XIAO Ming-yu, WANG Qin", CHEN Da-jun
(I. Shanghai Xinshanghua High Molecular Material Co. Ltd, Shanghai 200090, Chinar
2. State Key Laboratory of Chemical Fibers and Polymer Materials, College of Materials
Science and Engineering, Donghua University, Shanghai 201620, China)
Abstract: Dicumyl peroxide (DCP) was blended and diffused into polyethylene (PE)at the temperature
below the melting point of PE The cross-linking reaction was carried out at 180"C for 0.5 h. The non-
isothermal rystallization kinetics of dicumyl peroxide (DCP) modified PE was studied by differential
scanning calorimetry. The values of Avrami index(n)was between 3.2 and 4.2 which characterized the
coexistence of homogeneous nucleation and heterogeneous nucleation during the crystallization process in
this system. When the dosage of DCP was lower than a certain value, with the increase of DCP content the
crystallization temperature(T)was lowered while n became larger. When the dosage of DCP was more
than that, T was higher and n was smaller. The trend of Z. was the same as that of the value n
Key words; dicumyl peroxide, cross-linked PE; non-isothermal crystallization kinetics
聚乙烯(PE)因其耐低温、化学稳定性、电绝缘有熔点低、力学强度较低、耐环境应力性能较差等缺
性以及加工性能优良,成为工业、农业、建筑业、国防点,限制了PE的应用范围,其中一个最大的缺陷是
以及人们日常生活中不可缺少的材料。然而,PE具使用温度上限相对较低。通过交联,可以提高PE
收稿日期:2009-07-17回日:2009-1-22
甚金项目:上海市请年科技启明星计划(B07QB14039)资助
作者筒介:肖明字(1976~),男,湖南长沙人,高级工程师、博土生,主要从事热塑性高分子材料的改性与成形加工。
联蒸人:Tel021-67792891;13818020257,E-mail;zdi@dhu,edu.cn