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The Rheological Property and Foam Morphology of Linear Polypropylene and long chain branching Polypropylene

Journal of Wuhan University of Technology(Materials Science) 2013年第4期28卷 798-803页

作者：黄锦涛 HE Guangjian 廖霞 HUANG Yajiang YANG Qi College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Key Laboratory of Polymer Processing Engineering Ministry of Education South China University of Technology

The rheological behavior, thermal properties and foam morphology of linear polypropylene and long chain branching polypropylene prepared through UV irradiation reactive extrusion were studied by rheological test, melt index test, DSC and supercritical carbon dioxide foaming technology. Rheological test and melt index test confirmed that under UV irradiation and extrusion, adding photo-initiator and cross- linking agent could achieve the purpose of branching, thus improved the melt strength of polypropylene effectively. The DSC results revealed that with the introducing of long chain branching, the melting range of the polypropylene broadened and the crystallization temperature increased. Owing to the introduction of long chain branches, polypropylene exhibited higher melt strength and strain hardening behavior. Compared with linear polypropylene, the foam morphologies of long chain branching polypropylene were more uniform.

关键词： polypropylene long chain branching rheological behavior supereritical CO2 foaming

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Synthesis and Rheological Investigation of Model Symmetric 3-Arm Star Polyethylene

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Chinese Journal of Polymer Science 2014年第1期32卷 51-63页

作者： Feng Liu Dong Wan 唐涛 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

A variety of linear and 3-arm star polyethylene （PE） model polymers covering a wide range of molecular weight are synthesized by the living polymerization of butadiene and the subsequent hydrogenation. Several rheological parameters of these model linear and 3-arm star PE samples are analyzed for detecting the long chain branching （LCB） structure. It is found that the analyses based on zero shear viscosity, vGP plot and flow activation energy are very sensitive to the 3-arm star PEs. The information on the presence of LCB can be obtained with these methods even for low molecular weight samples, which can not be determined by GPC-MALLS. However the information about the LCB structure can not be obtained by the rheological methods alone.

关键词： long chain branching Rheology Star polymers Polyethylene Thermorheology.

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Synthesis of Well-defined long chain Branched Polyethylene via Anionic Polymerization Combined with Graft-onto Method

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Chemical Research in Chinese Universities 2013年第3期29卷 589-595页

作者： LIU Feng WANG Lu ZHANG Guang-chun ZHENG Jun TANG Tao State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China

Comb-like polyethylene（PE） was prepared via anionic polymerization combined with ＂graft-onto＂ process. The polybutadiene（PB） backbone underwent hydroxylation at 1,2-vinyl groups to obtain a controlled number of hydroxyl groups along the main chain. After the translation of hydroxyl groups to tosyl groups, a nucleophilic substitution by living anionic PB chains was achieved. The comb PE was finally obtained by the hydrogenation of the obtained unsaturated comb polymer. Since the living anionic polymerization was used to prepare the backbones and the branch chains, molecular weight to molecular weight distribution（Mw/Mn〈1.5） can be well-controlled in the final comb polymer, including the average number and length of branches.

关键词： long chain branching Polyethylene Anionic polymerization Comb-like polymer

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1,6-己二醇二丙烯酸酯熔融改性聚丙烯研究

1,6-己二醇二丙烯酸酯熔融改性聚丙烯研究

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2012年全国高分子材料科学与工程研讨会

作者：杨莉莉张雯张华集福建师范大学材料科学与工程学院福建省重点实验中心

＜正＞聚丙烯具有熔点高、耐热性优良、机械性能优异且易于加工成型等特点。然而,由Ziegler-Natta催化生成的聚丙烯为高结晶性的线性聚合物,其熔体强度低,熔体拉伸时表现不出应变硬化现象,导致热成型时制品壁厚不均匀,挤出涂布、压延时... 详细信息

＜正＞聚丙烯具有熔点高、耐热性优良、机械性能优异且易于加工成型等特点。然而,由Ziegler-Natta催化生成的聚丙烯为高结晶性的线性聚合物,其熔体强度低,熔体拉伸时表现不出应变硬化现象,导致热成型时制品壁厚不均匀,挤出涂布、压延时边缘卷曲、收缩,发泡时泡孔塌陷等问题,使PP应用范围受到限制。目前,可以通过共混改性法、熔融法,

关键词： polypropylene melt modification long chain branching

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