Effect of Processing History on Flow-Induced Crystallization of Polyethylene With Long-Chain Branches

IF 2.8 3区 化学 Q2 POLYMER SCIENCE
Kenta Komatsu, Naoki Yamano, Masayuki Yamaguchi
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引用次数: 0

Abstract

The effect of applied processing history on rheological properties and flow-induced crystallization is studied in polyethylene with long-chain branches that is prepared using a metallocene catalyst. The sample processed by a two-roll mill, in which elongational flow is dominant, shows marked strain hardening in transient elongational viscosity, as well as prompt crystallization once shear flow is further applied. In contrast, strain hardening in transient elongational viscosity and shear-induced crystallization are not prominent after passing through a single-screw extruder. These results suggest that shear-dominant flow in the extruder weakens the role of long-chain branches on rheological properties, known as shear modification, and flow-induced crystallization.

Abstract Image

加工历史对长链聚乙烯流动诱导结晶的影响
采用茂金属催化剂制备了具有长链分支的聚乙烯,研究了不同工艺条件对其流变性能和流动诱导结晶的影响。以伸长流动为主的双辊轧机试样,在瞬态伸长黏度下表现出明显的应变硬化,在进一步施加剪切流动的情况下,试样迅速结晶。相比之下,通过单螺杆挤出机后,瞬态拉伸粘度的应变硬化和剪切诱导结晶不明显。这些结果表明,挤压机中以剪切为主的流动削弱了长链分支对流变特性的作用,即剪切改性和流动诱导结晶。
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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
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