摘要
用可控流变法降解共聚聚丙烯(PP)获得可控流变共聚PP。采用应力流变仪和熔体流动速率仪研究可控流变共聚PP的流变性能,考察了基础树脂、过氧化物加入量、工艺参数对最终产品流变性能的影响。在熔体流动速率大、乙烯含量低的基础树脂中加入少量过氧化物便能显著改善流动性;当过氧化物的加入量超过一定值时,低频下的聚合物复数黏度反而增加;各种工艺参数对流变性能的影响由大到小依次为:挤出温度,喂料转速,主机转速:喂料转速与主机转速之比越小,熔体流动速率越高。
The rheology-controllable propylene copolymer was prepared via degradation of propylene copolymer with controllable rheology process. The rheological behavior of the rheology-controllable propylene copolymer was studied with the help of stress rheometer and melt indexer. The effects of basic resin, peroxide dosage and processing parameters on the rheological property of the final product were explored. Adding small amount of peroxide into the basic resin with high melt flow rate and low ethylene content could obviously improve the fluidity. Whereas, when peroxide dosage exceeded a certain value, complex viscosity at low frequency of the polymer was increased. The effect magnitude of each process parameter on the rheological property could be ranked in a descending sequence, i.e., temperature, feeding rate, rotation rate of extruder. The lower the ratio of feeding rate to rotation rate of the extruder, the higher the melt flow rate is.
出处
《合成树脂及塑料》
EI
CAS
北大核心
2007年第1期59-63,共5页
China Synthetic Resin and Plastics
关键词
共聚聚丙烯
流变性能
过氧化物
降解
propylene copelymer
rheological behavior
peroxide
degradation
