Rheological properties of high-melt-strength polypropylene with long-chain-branching structure prepared by 60Co-γ irradiation(Ⅱ)Extensional rheology

汪永斌 张丽叶

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Rheological properties of high-melt-strength polypropylene with long-chain-branching structure prepared by 60Co-γ irradiation(Ⅱ)Extensional rheology

更新时间：2025-12-10

- Rheological properties of high-melt-strength polypropylene with long-chain-branching structure prepared by 60Co-γ irradiation(Ⅱ)Extensional rheology
- CIESC Journal Issue 2, (2007)
- 作者机构：
  
  北京化工大学材料科学与工程学院
- 作者简介：
- 基金信息：
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- Online First：05 February 2007，
  
  Published：05 February 2007
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汪永斌张丽叶. Rheological properties of high-melt-strength polypropylene with long-chain-branching structure prepared by 60Co-γ irradiation(Ⅱ)Extensional rheology[J]. CIESC Journal, 2007, (2).
DOI：

汪永斌张丽叶. Rheological properties of high-melt-strength polypropylene with long-chain-branching structure prepared by 60Co-γ irradiation(Ⅱ)Extensional rheology[J]. CIESC Journal, 2007, (2). DOI：

摘要

通过辐照法制备了长支链型高熔体强度聚丙烯(LCB-HMSPP)，采用Rheotens熔体拉伸流变仪研究了辐照改性PP的熔体强度和拉伸流变行为，讨论了敏化剂含量、辐照剂量、高分子量物质和温度对PP拉伸流变行为的影响。研究结果表明：PP的熔体强度、拉伸应力、拉伸黏度等拉伸流变物理量随敏化剂增加而显著增强，并随辐照剂量呈先上升后下降的趋势，辐照剂量为5kGy时，熔体强度和拉伸黏度到达最大。添加极少量高分子量物质(UHMWPE)也能有效提高PP的熔体强度。LCB-HMSPP的熔体强度活化能显著降低，熔体强度温度敏感性下降，可在较宽的温度范围内表现出较高的熔体强度。

Abstract

High-melt-strength polypropylene with long chain branching structure(LCB-HMSPP) was prepared by 60Co-γ ray irradiation in the presence of bi-functional monomerGttfert Rheotens extensional rheometer was used to characterize extensional rheological behavior of this LCB-HMSPPThe effects of sensitizer content

radiation dose

adding a small amount of high molecular weight component

as well as temperature were investigatedIt was indicated that melt strength

extensional stress and transient extensional viscosity were prominently enhanced after 60Co-γ ray irradiation. In addition

these extensional parameters increased with increasing sensitizer contentMelt strength

extensional viscosity reached a maximum when radiation dose approximately equaled to 5kGyAdding a small amount of ultra high molecular weight polyethylene(UHMWPE) could also play an important part in enhancing the extensional rheological behavior of PPThe activation energy of melt strength decreased with increasing sensitizer content and by adding a small amount of UHMWPELCB-HMSPP showed less temperature sensitivity than linear PP

and exhibited high melt strength

high extensional viscosity in a broad range of temperature.

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