摘要
采用PP与PE-HD共混的方法来改善PP的发泡性能，并从共混体系的熔体强度和结晶性能两个方面分析PE-HD含量对泡孔结构的影响机理。结果表明，PP／PE-HD共混体系的熔体强度随着PE-HD含量的增加先升高后减小，在含量为30％（质量分数，下同）时熔体强度最高。随着PE-HD含量的增加，共混体系中PP和PE-HD的熔点先升高后降低，PP的结晶度先减小后增大，而PE-HD的结晶度却逐渐增加。在含量为30％时，PP和PE-HD的熔点最高，PP的结晶度最小。PP与PE-HD共混以后，泡孔结构有了很大改善，且与熔体强度和结晶度相对应，泡孔结构在PE-HD含量为30％时最好。
The objective of this study is to improve the PP foaming processibility by blending with PE-HD. The principle of the effect of PE-HD content on the cellular structure was analyzed by comparing the melt strengths and crystallinities of the blends. Experimental results showed that the melt strength of the blends, the melting points of PP and PE-HD all exhibited a maximum at an PE-HD content of 30 %. At this composition, the crystallinity of PP gave rise to a minimum. The cellular structures of PP microcellular foams were greatly improved by blending with PE-HD. The cellular structure was the most uniform at an PE-HD content of 30 %.
出处
《中国塑料》
CAS
CSCD
北大核心
2007年第2期59-63,共5页
China Plastics
关键词
高密度聚乙烯
聚丙烯
熔体强度
发泡
high density polyethylene
polypropylene
melt strength
foaming
