降冰片烯二酸酐接枝改性聚烯烃弹性体的制备与性能

Preparation and Properties of Polyolefin Elastomers Grafted with Norbornene Diacid Anhydride

通过熔融接枝法制备降冰片烯二酸酐(NA)接枝改性聚烯烃弹性体(POE),系统地研究了接枝单体用量、引发剂用量、主机螺杆转速以及加工温度等条件对产物接枝率的影响。通过傅里叶变换红外光谱仪(FTIR)对产物结构进行表征,使用酸碱滴定法计算接枝产物中NA的接枝率,采用热分析仪(TG)和差示扫描量热仪(DSC)研究其热性能。结果表明,接枝单体用量的增加及引发剂用量在质量分数0.4%~1.0%范围内的增加均有助于提高产物接枝率。控制加工过程中挤出机主机螺杆转速、加工温度等工艺参数在合适的范围内也可提高产物接枝率。综合各指标,获得最佳工艺参数如下:接枝单体质量分数为5%~7%,引发剂质量分数为0.6%~0.8%,螺杆转速为250~300 r/min,加工温度为200~220℃。该条件下接枝率可达1.5%以上,熔体质量流动速率6~7 g/10 min(230℃,2.16 kg),热性能较佳。

Polyolefin elastomer(POE)modified by norbornene dihydride(NA)was prepared by the melt grafting.The effects of the amount of graft monomer,initiator,main screw speed and processing temperature on the grafting rate of the product were systematically studied.The structures of the product were characterized by Fourier transform infrared spectroscopy(FTIR).The grafting rate of NA in grafted products was calculated by the acid-base titration.The thermal performances were studied by thermal analyzer(TG)and differential scanning calorimeter(DSC).The results show that the amount increments of graft monomer and initiator in the range of 0.4%-1.0%could improve the product grafting rate.The grafting rate of the product could also be improved by controlling the process parameters such as main screw speed and processing temperature in the appropriate range.The optimum process parameters were obtained with a 5%-7%mass fraction graft monomer,a 0.6%-0.8%mass fraction initiator,a screw speed of 250-300 r/min,and a processing temperature of 200-220℃.Under this condition,the grafting rate is 15%,the melt mass flow rate is 6-7 g/10 min(230℃,2.16 kg)and the thermal properity is better.