Stress and Optical Behavior of Polymers under Supercritical Carbon Dioxide

超临界二氧化碳下聚合物的应力和光学行为

• 批准号: 18550187
• 负责人: SAITO Hiromu
• 金额: $ 2.62万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18550187/
• 关键词: supercritical carbon dioxide; elongation; stress; high density polyethylene; polycarbonate; crystal; 複屈折

We designed a tensile testing system in which we can measure the stress-strain behavior of polymer films during the elongation under supercritical carbon dioxide. The stress and modulus of high density polyethylene were found to be lowered under supercritical carbon dioxide than that under air at ambient pressure. The decrease of stress and modulus is attributed to the plasticization effect of carbon dioxide in the amorphous region. Since the distance between the lamellar stack becomes wider after the rotation of the lamellar stack by elongation and the carbon dioxide is not dissolved into the crystalline region in the lamellar stacks, the change in the mechanical property under supercritical carbon dioxide might be attributed to the deformation of lamellae due to the decrease of the chain density in the amorphous region between the lamellar stack or lamellae. The amorphous polymer polycarbonate was found to be changed from ductile to brittle with increasing the pressure of carbon dioxide at high pressure above 5 MPa, while the stress decreased and the strain at break increased by dissolving carbon dioxide at lower temperature.

我们设计了一套拉伸试验系统，可以测量聚合物薄膜在超临界二氧化碳条件下拉伸过程中的应力-应变行为。结果表明，在超临界二氧化碳中，高密度聚乙烯的应力和模量比在常压空气中低。应力和模量的降低归因于二氧化碳在非晶区的增塑作用。由于在片层堆叠体通过伸长旋转之后片层堆叠体之间的距离变宽，并且二氧化碳没有溶解到片层堆叠体中的结晶区域中，因此在超临界二氧化碳下的机械性质的变化可能归因于由于片层堆叠体或片层之间的非晶区域中的链密度的降低而引起的片层的变形。结果表明，当压力高于5 MPa时，随着CO2压力的增加，无定形聚碳酸酯由韧性向脆性转变;当温度较低时，CO2溶解使无定形聚碳酸酯的应力降低，断裂应变增加。

项目成果

Role of amorphous region on the deformation behavior of crystalline polymers.

非晶区对结晶聚合物变形行为的作用。

• 期刊: Polym. J. (in print)
• 作者: Murakami.A;et al.;K. Nakayama;K. Ito;T. Tateishi;Hiroshi Wada;M.Fukuoka
• 通讯作者: M.Fukuoka

Light scattering studies on the crystalline morphology of stretched poly (ethylene2, 6-naphthalate) film

拉伸聚（2,6-萘二甲酸乙二醇酯）薄膜晶体形貌的光散射研究

• 发表时间: 2007
• 期刊: Polymer 48
• 作者: J. Y. Nam;M. Fukuoka;H. Saito;T. Inoue
• 通讯作者: T. Inoue

Spinodal Decomposition Induced Crystallization in Polycarbonate / Carbon Dioxide System

聚碳酸酯/二氧化碳体系中的调幅分解诱导结晶

• 发表时间: 2007
• 作者: J.;Chen;H.;Saito
• 通讯作者: Saito

超臨界流体下での溶融混練によるポリビニルアルコールの化学修飾の促進

超临界流体熔融混炼促进聚乙烯醇化学改性

• 发表时间: 2007
• 作者: 小野寺;斎藤拓;西村洋平
• 通讯作者: 西村洋平

Morphology and Property of Polyethylene Obtained by Drawing under Carbon Dioxide

二氧化碳拉伸聚乙烯的形貌与性能

• 发表时间: 2007
• 作者: M.;Kikuchi;H.;Saito
• 通讯作者: Saito