Molecular Dynamics in failure initialtion of polymeric materials

高分子材料失效引发的分子动力学

• 批准号: 16550172
• 负责人: NITTA Koh-hei
• 金额: $ 2.37万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16550172/
• 关键词: near-infrared spectrum; rheo-optics; yield behavior; tensile properties; polypropylene; polyethylene; 近赤外分光法; イソタクチックポリプロピレン

A rheo-optical study has been developed to examine the nature of the structural changes, using the near-infrared spectroscopy. In this work, we investigated the strain (ε) dependence of structural changes of isotactic polypropylene (iPP) and polyethylene (PE) materials during uniaxially stretching using a rheo-optical technique ; in which the near-infrared spectra and tensile stress were simultaneously measured as a function of elongation time. It was found that the absorption coefficients of near-infrared spectra had a minimum at yield point and then reached a maximum at around the neck initiation, indicating that the main-chain motion is restricted by stretching up to the yield point. The yield point could represent the onset of the release of the molecular motion.

一个流变光学的研究已经开发到检查的性质的结构变化，使用近红外光谱。采用流变光学技术研究了等规聚丙烯（iPP）和聚乙烯（PE）材料在单轴拉伸过程中结构变化的应变（ε）依赖性，同时测量了近红外光谱和拉伸应力随拉伸时间的变化。结果表明，主链的近红外吸收系数在屈服点处有一个最小值，然后在颈部附近达到一个最大值，表明主链的运动受到拉伸的限制。屈服点可以代表分子运动释放的开始。

项目成果

Influence of Morphological Factors on Tensile Properties in the Pre-yield Region of Isotactic Polypropylenes

形态因素对等规聚丙烯预屈服区拉伸性能的影响

• 发表时间: 2006
• 期刊: Polymer Journal 38(2)
• 作者: K.Nitta;N.Yamaguchi
• 通讯作者: N.Yamaguchi

Application of Catastrophe Theory to the Neck-initiation of Semicrystalline Polymers Induced by the Intercluster Links

• DOI: 10.1295/polymj.pj2005211
• 发表时间: 2006-08
• 期刊: Polymer Journal
• 影响因子: 2.8
• 作者: K. Nitta;M. Takayanagi