摘要
以1,6-己二醇二丙烯酸酯(HDDA)为接枝单体,苯乙烯(St)为共聚单体对聚丙烯(PP)进行熔融接枝,并在反应体系中加入β成核剂,从而改变PP晶型,通过接枝长支链提高聚丙烯的熔体强度。研究了螺杆转速、引发剂用量、单体摩尔比及投料量对熔体流动速率和熔体强度的影响。采用傅里叶变换红外光谱仪、热重分析仪及X射线衍射仪等对改性材料的结构和性能进行分析。结果表明,在优化的反应条件下,接枝改性PP的熔体流动速率和熔体强度分别为0.70g/10min,10.00kPa·s;热稳定性也比纯PP有很大程度提高。
Polypropylene（PP） was melt grafted with 1,6-hexanediol diacrylate （HDDA） and styrene in order to increase the melt strength. β nucleating agent was added to the reaction system to change the crystalline of PP. The influences of screw speed, dosage of initiator, molar ratio of monomers, and material mass on melt flow rate and melt strength were studied. The structure and properties of modified PP were analyzed using infrared spectroscopy, thermal-gravimetric analysis, and X-ray diffraction. The melt flow rate and melt strength of grafted PP were 0. 70 g/10 min and 10.00 kPa · s, respectively. The heat stability was also improved through the grafting.
出处
《中国塑料》
CAS
CSCD
北大核心
2014年第2期35-40,共6页
China Plastics
关键词
聚丙烯
熔体强度
Β成核剂
反应挤出
长链支化
polypropylene
melt strength
β nucleating agent
reactive extrusion
long chain branched
