Structure Changes of Polymeric Materials under Large Deformation

高分子材料大变形下的结构变化

• 批准号: 09450361
• 负责人: OSAKI Kunihiro
• 金额: $ 7.62万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450361/
• 关键词: Glass Transition; Viscoelasticity; Poisson Ratio; Polymeric Material; ポアソン比; 体積緩和

Time evolution of Poisson ratio of polystyrene during elongation deformation with constant rates was measured by a newly developed tensile tester equipped with a strain gage based on LASER speckle method in order to study cohesive structure changes induced by deformation around the glass transition zone. Time evolution of the ratio measured at low strain rates, at which viscosity growth function showed linear response, could be superimposed to a composite curve by the method of reduced variables with the same shift factor for the viscoelastic function. The obtained composite curve changed from 0.33 in the glassy zone to 0.5 in the rubbery zone. However, the experimental curve was not in accord with the prediction by a simple linear response theory. This result may be attributed to strong nonlinear nature of volume relaxation phenomena. At higher strain rates, where viscosity growth function showed nonlinear response, Poisson ratio in the short time region increased.

为了研究聚苯乙烯在玻璃化转变区附近变形引起的内聚结构变化，采用激光散斑法测量了聚苯乙烯在恒速率拉伸变形过程中泊松比随时间的变化。在低应变速率下测得的粘度增长函数呈线性响应的比值的时间演化可以通过减少变量的方法叠加到复合曲线上，其中粘弹性函数具有相同的移位因子。得到的复合曲线从玻璃态区的0.33变为橡胶态区的0.5。然而，实验曲线与简单线性响应理论的预测值并不雅阁。这一结果可能归因于体弛豫现象的强非线性性质。在较高的应变速率下，粘度增长函数呈非线性响应，泊松比在短时间区域增加。

项目成果

Tadashi INOUE: "Effect of Wave Length on Strain-Induced Birefringence of Polymers" Polymer Journal. 30. 929-934 (1998)

Tadashi INOUE：“波长对聚合物应变诱导双折射的影响”聚合物杂志。

Tadashi INOUE: "Effect of Wave Length on Strain-Induced Birefringence of Polymers" Polymer Journal. Vol.30. 929-934 (1998)

Tadashi INOUE：“波长对聚合物应变诱导双折射的影响”聚合物杂志。

D.S.Ryu: "A Birefringence Study of Polymer Crystalligation in the Process of Elongation of films" Polymer. 39・12. 2515-2520 (1998)

D.S.Ryu：“薄膜拉伸过程中聚合物结晶的双折射研究”聚合物 39・12（1998）。

Tadashi INOUE: "Viscoelasticity of Low Molecular Weight Polystyrene. Separation of Rubbery and Glassy Components" Journal of Polymer Science : Part B : Polymer Physics. 37. 389-397 (1999)

Tadashi INOUE：“低分子量聚苯乙烯的粘弹性。橡胶和玻璃成分的分离”高分子科学杂志：B 部分：高分子物理学。

井上 正志: "ガラス転移領域での高分子のずり流動複屈折測定" 日本レオロジー学会誌. 26. 237-241 (1998)

Masashi Inoue：“玻璃化转变区域聚合物的剪切流双折射测量”日本流变学会杂志 26. 237-241 (1998)。