摘要
利用熔体流动速率测试仪和转矩流变仪对不同比例的高熔体强度聚丙烯(HMSPP)/低密度聚乙烯(PE-LD)共混体系的流变行为进行研究,并对共混体系的流变数据进行分析。随后采用超临界CO2作为发泡剂进行了HMSPP/PE-LD共混体系的挤出发泡研究,并通过真密度计和扫描电子显微镜表征了发泡材料的表观密度和泡体结构参数。结果表明,纯HMSPP的熔体弹性优于纯PE-LD,但是共混体系中PE-LD的比例在50%以下时,对共混体系的熔体弹性影响较小,能够保持纯HMSPP较好的可发性。同时少量加入PE-LD能够提高共混体系的泡孔密度,当PE-LD含量过多时,发泡倍率和泡孔密度均出现下降,泡孔分布不均匀。
High meh strength polypropylene was blended with low density polyethylene, and the rheology behavior was studied by melt flow rate instrument/torque rheometer, and rheologieal data was analysed. Then the blends were extrusion foamed with supercritical CO2 as vesicant, foam density and morphology of HMSPP/PE-LD blends were tested by using densimeter and SEM. The result showed that melt elastic of HMSPP was better than that of PE-LD. However, melt elastic of blends were slightly affected when PE- LD content was lower than 50% , blends possessed excellent foamability. Adding PE-LD within certain content to blends would increase cell density of blends. When PE-LD exceed certain content, foaming rate and cell density of foam samples would greatly decrease.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2011年第10期78-83,共6页
Engineering Plastics Application
基金
科技部科研院所技术开发研究专项资金项目(2008EG111015)
关键词
高熔体强度聚丙烯
低密度聚乙烯
共混体系
挤出发泡
流变行为
泡孔密度
high melt strength polypropylene, low density polyethylene, blend, extrusion foaming, rheology behavior, cell density
