Nucleation and growth mechanism of polymers with high purity-important role of molecular weight

高纯度聚合物的成核和生长机理——分子量的重要作用

• 批准号: 09450364
• 负责人: HIKOSAKA Masamichi
• 金额: $ 2.24万
• 依托单位: HIROSHIMA 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-09450364/
• 关键词: POLYMER; CRYSTALLIZATION; MOLECULAR WEIGHT; DIFFUSION; NUCLEATION; INTERFACE

Nucleation and growth mechanism of polymers with high purity was studied based on the new experimental findings on the molecular weight (M) dependence of nucleation and growth rates, 1 and V.respectively. Pure and well fractionated Polyethylene (PB) and isotactic polypropylene (iPP) were isothermally crystallized at atmospheric pressure or under high pressure (P=4kb). It is found on PE that V ocM^-^H, where His a constant, which was named "power law of lateral growth rate". Similar law was also found on iPP.It is also found on PE for the first time that I ocM^-^H which was named "power law of nucleation rate". These results suggest the universality of the "power law" in crystallization mechanism. A topological model was proposed to explain the results that the nucleation and growth of polymers is a process of disentanglement and chain sliding diffusion within the melt, nucleus, crystal and interface between the melt and crystals.

基于高纯度聚合物成核和生长速率与分子质量(M)的相关性（1和v）的新实验发现，研究了高纯聚合物的成核和生长机理。分别在常压和高压（P=4kb）下等温结晶纯化和分馏良好的聚乙烯（PB）和等规聚丙烯（iPP）。在PE上发现V ocM^-^H，其中His为常数，称为“横向增长率幂律”。iPP上也发现了类似的规律。在PE上也首次发现了I ocM^-^H，并将其命名为“成核速率幂定律”。这些结果表明了“幂律”在结晶机理中的普遍性。提出了一个拓扑模型来解释聚合物的成核和生长是熔体、核、晶体和熔体与晶体之间界面的解缠和链滑扩散过程。

项目成果

M.Nishi: "Molecular wieght dependence of lateral growth rate of polyethylene(1)---an extended chain single crystal" Polymer. 39. 1591-1596 (1998)

M.Nishi：“聚乙烯（1）横向生长速率的分子重量依赖性——一种长链单晶”聚合物。

A.Toda.C.Tomita.M.Hikosaka and Y.Saruyama: "An application of Temperature Modulated DSC to the exothermic process of poly(ethylene terephthalate)crystallization" Polymer. 38. 2849-2852 (1997)

A.Toda.C.Tomita.M.Hikosaka 和 Y.Saruyama：“温度调制 DSC 在聚对苯二甲酸乙二醇酯结晶放热过程中的应用”聚合物。

A.Toda.T.Oda.M.Hikosaka and Y.Saruyama: "A new analyzing method of temperature modulated DSC of exo-or endo-thermic process:Application to polyethylene crystallization" Thermochimica Acta. 293. 47-64 (1997)

A.Toda.T.Oda.M.Hikosaka 和 Y.Saruyama：“放热或吸热过程的温度调制 DSC 的新分析方法：在聚乙烯结晶中的应用”Thermochimica Acta。

A.Toda, C.Tomita and M.Hikosaka: "Temperature Modulated DSC of irreversible melting of nylon 6 crystals" J.Therm.Anal.54. 623-635 (1998)

A.Toda、C.Tomita 和 M.Hikosaka：“尼龙 6 晶体不可逆熔化的温度调制 DSC”J.Therm.Anal.54。

T.Hattori, T.Watanabe, S.Akama, M.Hikosaka and H.Ohigashi: "The high-pressure crystallization behaviors and piezoelectricity of extended chain lamellar crystals of vinylidene fluoride trifluoroethylene copolymers with high molar content of vinylidene fluo

T.Hattori、T.Watanabe、S.Akama、M.Hikosaka 和 H.Ohigashi：“高偏二氟乙烯摩尔含量的偏二氟乙烯三氟乙烯共聚物的长链层状晶体的高压结晶行为和压电性