Free Volumes of Ploymers Studied by Positron Annihilation

通过正电子湮灭研究聚合物的自由体积

• 批准号: 06651064
• 负责人: SUZUKI Takenori
• 金额: $ 1.22万
• 依托单位: NATIONAL LABORATORY FOR HIGH ENERGY PHYSICS
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06651064/
• 关键词: POSITRON ANNIHILATION; POSITONIUM; POLYMER; POLYMERIZATION; POLYETHYLRNE; EPOXY RESINS; FREE VOLUME HOLES; INTEGRATED CIRCUITS; ガンマ線照射効果; 陽電子照射効果; ポリプロピレン

A positron-annihilation lifetime (PAL) technique was applied to four kinds of epoxy resin (cresol novolac (CR), tris-hydroxy-phenyl-methane (THPM), tetra-methyl-biphenol (TMB) and bis-phenol A (BA)) in order to study the relation between the intermolecular space holes and water absorption. The size of the holes was measured based on the lifetime (tau_3) of the ortho-positronium (o-Ps). Since THPM has a larger tau_3 value (hence, a larger intermo-lecular-space hole) and absorption rate than that of the other samples, the correlation between tau_3 and the absorption rate has been shown to be evident.Assuming a very simplified model, the shapes of the holes for the smallest unit cell were calculated using a computer code of molecular-dynamics ; the shape for THPM was found to be different from those of the other three samples.A polymerization process of Bisphenol-A dicyanate (BADCy) has been studied by a positron annihilation lifetime (PAL) technique. In the process, BADCy was cured through triazine ring formation by heating ; the state changed from a powder at room temperature, through a liquid above the melting point, to a solid after curing at high temperatures. It has been shown that PAL is a powerful technique for studying microscopic structure changes and the state transition of the continuous polymerization process.

用正电子湮没寿命（PAL）技术研究了四种环氧树脂（甲酚酚醛（CR）、三羟基苯基甲烷（THPM）、四甲基双酚（TMB）和双酚A（BA））的分子间空穴与吸水率的关系。基于正电子素（o-Ps）的寿命（tau_3）测量孔的尺寸。由于THPM具有较大的τ_3值，在一个非常简化的模型下，用分子动力学程序计算了最小单胞的空穴形状;用正电子湮没寿命（PAL）技术研究了双酚A二氰酸酯（BADCy）的聚合过程。在该过程中，BADCy通过加热形成三嗪环而固化;状态从室温下的粉末，通过熔点以上的液体，在高温下固化后变为固体。实验结果表明，PAL技术是研究连续聚合过程微观结构变化和状态转变的有效手段。

项目成果

鈴木健訓,他: "Polymerization of bisphenol-A dicyanate studied by positron annihilation" Material Science Forum. 175-178. 785-788 (1995)

Takenori Suzuki 等人：“通过正电子湮灭研究双酚 A 二氰酸酯的聚合”材料科学论坛 175-178 (1995)。

T.SUZUKI,et al.: "Effects of Aging and Oxidation on Positronium Formation in Polyethylenes" Radiation Physics and Chemistry. Vol.43. 557-562 (1994)

T.SUZUKI 等人：“老化和氧化对聚乙烯中正电子形成的影响”辐射物理和化学。

鈴木健訓、他: "Radiation eftect on polypropylene studied by relaxational behavior at lon tenperatare using positron annihilation" Polymer. (in Press). (1996)

Takenori Suzuki 等人：“利用正电子湮灭在高温下的松弛行为研究聚丙烯的辐射效应”（出版中）。

T.SUZUKI,et al.: "Structure dependence of gamma-ray irradiation effects on polyethylenes studied by positron annihilation" Radiation Physics and Chemistry. Vol.45. 797-804 (1995)

T.SUZUKI 等人：“通过正电子湮灭研究聚乙烯的伽马射线照射效应的结构依赖性”辐射物理与化学。

鈴木健訓、他: "Structure dependenvce of r-ray irradiation effects on polyethylenes stidied by positron annihilation" Radiation Physics and Chemistry. 45. 797-804 (1995)

Takenori Suzuki 等人：“通过正电子湮没研究对聚乙烯的 r 射线照射效应的结构依赖性”辐射物理与化学 45. 797-804 (1995)。