摘要
在N_2气氛下用低能电子束辐射了4种类型聚乙烯样品(HDPE、LDPE、LLDPE、VLDPE)。结果表明,样品的分子结构和物理形态对凝胶点、交联与裂解的能量产率G(X)和C(S)均有很大的影响。电子辐射引起了分子中不饱和结构的变化。在所研究的辐射剂量范围内(<26Mrad),反式双键的增加符合零级反应动力学。在辐射剂量小于14Mrad时,末端双键的衰减可用一级反应动力学来处理;但当辐射剂量进一步增加时,由于分子链裂解导致末端双键的增加,使衰减行为偏离一级反应动力学曲线。
Four types of polyethylenes(HDPE,LDPE,LLDPE,and VLDPE)were irradiated with low energy electron beam in N_2 atmosphere.The results show that the molecular structure and physical morphology have great influ-ence on the gel points and the energy yields G(X)and G(S)for crosslinks and scissions respectively.The irradiation causes changes of unsaturation structure of the samples.The increase of trans-vinylene obeys the zero-order reaction kinetics within the dose range studied here(<26 Mrads).In the case of dose less than 14 Mrads,the decay of terminal vinyl can be treated with the first-order reaction kinetics;however,its decay behavior diverges from the kinetic curves with further increasing dose for all samples because of the chain seissions,which lead to the increase of the vinyl
出处
《中山大学学报（自然科学版）》
CAS
CSCD
1990年第1期48-54,共7页
Acta Scientiarum Naturalium Universitatis Sunyatseni
关键词
聚乙烯
电子束
辐射
凝胶
electron beam irradiation
polyethylene
gel formation
unsaturation
