摘要
分别在哈克流变仪(Haake)和双螺杆挤出机(TSE)中,研究了苯乙烯(St)存在下马来酸酐(MAH)熔融接枝聚丙烯(PP)的过程。讨论了过氧化二异丙苯(DCP)用量、St用量、MAH用量、反应时间、反应温度、螺杆转速以及反应器型式对接枝反应的影响。实验发现:随DCP用量的增加,MAH的接枝率先增加后减小,熔体流动速率(MFR)一直增加;保持MAH用量不变增加St用量时,MAH的接枝率在MAH与St的摩尔比为1:1时达到最大,MFR却一直减小;保持St用量不变增加MAH用量,MAH的接枝率先增加后略有减小,MFR却存在极大值;随反应时间的增加,MAH的接枝率与MFR都先增加后减小;温度过高,MAH的接枝率降低,PP热降解较严重;螺杆转速较低时,MAH的接枝率较低,螺杆转速较高时,PP降解增加;在TSE中的MAH接枝率比Haake中的低,但降解比Haake中的小得多。
In the presence of styrene （St）, the melting-grafting of maleic anhydride （MAH） onto polypropylene was conducted in Haake torque rheometer and twins screw extruder （TSE） respectively. In experiments the dicumyl peroxide （DCP） concentration, St concentration, MAH concentration, reaction time, reaction temperature and screw speed were varied respectively. Results show that with the DCP concentration increasing, both the grating degree of MAH and melt flow index （MFR） of the grafted product increase at first and then deerease. When maintaining MAH concentration and increasing St concentration, the grafting degree of MAH reaches maximum at St：MAH=1mol·mol^-1 and MFR always keeps decreasing, When maintaining St concentration and increasing MAH concentration, the grafting degree of MAH increases at first and then slightly decreases, and during which the MFR has a maximum point. With the reactive time increasing, both the grating degree of MAH and MFR of the grafted product increase at first and then decrease. When temperature is too high, the grafting degree of MAH decreases and the scission of the grafted product increases. When screw speed is low, the grating degree of MAH is low too, and when screw speed is high, the scission of the grafted product increases. The grafting of MAH in TSE is lower than that in Haake torque rheometer, while MFR of the grafted product in TSE is much lower than that in Haake torque rheometer. Based on the mechanism of melt-grafting, the above experimental results were discussed and explained.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2005年第5期648-653,共6页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金重大项目(50390097)
国家重点基础研究发展规划项目(2001CB711203)
关键词
聚丙烯
马来酸酐
苯乙烯
熔融接枝
polypropylene
maleic anhydride
styrene
melt-grafting
