Glass Transition and Crystal Growth of Rubbers

橡胶的玻璃化转变和晶体生长

• 批准号: 13440123
• 负责人: MIYAMOTO Yoshihisa
• 金额: $ 9.54万
• 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: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440123/
• 关键词: RUBBER; GLASS TRANSITION; POLYMER; CRYSTAL GROWTH; MEMORY; DEFORMATION; RHEOLOGY

In the research on glass transition, the memory effect. upon glassification is studied in the glass to rubber transition of vulcanized rubber with the strain as a controlling parameter. A phenomenological model is proposed taking the history of the temperature and the strain into account, by which the experimental results are interpreted. The data and the model demonstrate that the glassy state, memorizes the time-course of strain upon glassification, not as a single parameter but as the history itself.The crystallization and the melting of vulcanized isoprene rubber under uniaxial deformation have been studied by the measurements of the stress-strain-temperature relation. The melting temperature increases approximately linearly with nominal stress for the rubbers crystallized at a fixed temperature and stress condition. It: has been shown that the main origin, of the rise in melting temperature with stress is the work of contraction upon melting rather than the entropy reduction on deformation in the molten state. The crystallization rate monotonically increases with nominal stress above the melting stress at a given temperature, while it shows a maximum against temperature at a given stress.. The relation between the temperature and the nominal stress at the onset of crystallization is satisfactorily reproduced by the simplified kinetic model.

在玻璃化转变的研究中，研究了记忆效应。以应变为控制参数，研究了硫化橡胶在玻璃化过程中向橡胶的转变。提出了一个考虑温度和应变历史的唯象模型，并用该模型解释了实验结果。数据和模型表明，玻璃态记录了玻璃化过程中应变的时间过程，而不是作为单个参数，而是作为历史本身。通过测量应力-应变-温度关系，研究了硫化异戊二烯橡胶在单轴变形下的结晶和熔融过程。对于在固定温度和应力条件下结晶的橡胶，熔融温度与名义应力近似线性上升。结果表明，熔化温度随应力升高的主要原因是熔化时的收缩做功，而不是熔融状态下变形的熵降低。在一定温度下，结晶速率随名义应力的增加而单调增加，而在一定应力下，结晶速率随温度的升高而出现最大值。简化动力学模型较好地再现了结晶开始时的温度与名义应力之间的关系。

项目成果

A.Koyama: "Molecular Dynamics Studies on Polymer Crystallization from a Stretched Amorphous State"J.Macromol.Sci.. B42巻・3-4号. 821-832 (2003)

A.Koyama：“拉伸非晶态聚合物结晶的分子动力学研究”J.Macromol.Sci.. B42 第 3-4 卷（2003 年）。

K.Taguchi, Y.Miyamoto, H.Miyaji, K.Izumi: "Undulation of Lamellar Crystals of Polymers by Surface Stresses"Macromolecules. 36, no.14. 5208-5213 (2003)

K.Taguchi、Y.Miyamoto、H.Miyaji、K.Izumi：“表面应力引起的聚合物层状晶体的波动”大分子。

S.Minami, N.Tsurutani, H.Miyaji, K.Fukao, Y.Miyamoto: "SAXS study on structure formation from the uniaxially oriented glass in isotactic polypropylene"Polymer. 45, no.5. 1413-1416 (2004)

S.Minami、N.Tsurutani、H.Miyaji、K.Fukao、Y.Miyamoto：“等规聚丙烯中单轴取向玻璃结构形成的 SAXS 研究”聚合物。

K.Fukao, S.Uno, Y.Miyamoto, A.Hoshino, H.Miyaji: "Dynamics of a and j3 processes in thin polymer films: Polyvinyl acetate) and poly(methyl methacrylate)"Phys. Rev. E. 64 (5). 051807-1-051807-11 (2001)

K.Fukao、S.Uno、Y.Miyamoto、A.Hoshino、H.Miyaji：“聚合物薄膜中 a 和 j3 过程的动力学：聚乙酸乙烯酯和聚甲基丙烯酸甲酯”

A.Koyama: "Molecular dynamics simulation of polymer crystallization from an oriented amorphous state"Phys. Rev. E. 65巻・5号. 050801(R)-1-050801(R)--4 (2002)

A. Koyama：“定向非晶态聚合物结晶的分子动力学模拟”Phys.Rev.E.第 65 卷，第 5 期。050801(R)-1-050801(R)--4 (2002)