THE FACTORS CONTROLLING THE X-RAY INDUCED SOLID-STATE POLYMERIZATION-REACTIONS

X射线诱导固态聚合反应的控制因素

基本信息

项目摘要

The purpose of this project is to clarify the factors controlling the polymerization reactions induced by photon and ionizing radiation in crystals.1. We mainly studied 2+2 cycloaddition reaction in crystalline 2,5-distyrylpyrazine which had been known as typical topochemical reaction. From the pico-second laser-photolysis measurements, we found that excimer sites, probably originated from irregularity of the crystal lattice, playd an important role in the reaction. From the observation by pulse radiolysis that the similar excimers were formed by the irradiation of electron pulse, we expected the similar reaction to be occurred by ionizing radiation ; actually, it was confirmed by using ^<60>Co gamma-ray. Thus, we succeeded in initiating the polymerization reaction more homogeneously, in comparison with the case of photo-illuminated systems, by irradiating crystal throughout the bulk. This last part of the results was summarized in the paper submitted to Bulletin of the Chemical Society of Japan on March 13,1997.2.We studied the isomerization reaction of radicals produced by ionizing radiation in two different model compounds of solid polyethylene, crystalline n-C_8H_<18> and c-C_<13>H_<28>, by using ESR.It was found that in the triclinic and the orthorhombic crystals the initially formed primary radicals were thermally converted to the penultimate alkyl radicals. Thus, one of the important factors which control the crosslinking reaction taking place in crystalline part of solid polyethylene was elucidated.
本计画的目的是要厘清晶体中光子与电离辐射引发聚合反应的控制因素。本论文主要研究了结晶型2,5-二苯乙烯基吡嗪的2+2环加成反应。通过皮秒激光光解实验,我们发现准分子位置在反应中起着重要作用,它可能来源于晶格的不规则性。通过脉冲辐解观察到电子脉冲辐照产生类似的准分子,我们预期电离辐射也会发生类似的反应,实际上,这一点已被γ-<60>Co γ射线证实。因此,与光照射系统的情况相比,我们成功地通过在整个本体中照射晶体来更均匀地引发聚合反应。2.我们用ESR研究了聚乙烯两种不同模型化合物结晶n-C_8H_和c-C_ H_中电离辐射产生的自由基的异构化反应<18><13><28>,发现在三斜晶系和正交晶系晶体中,初始形成的初级自由基发生了热转化到倒数第二个烷基。从而阐明了控制交联反应发生在固体聚乙烯结晶部分的重要因素之一。

项目成果

期刊论文数量(26)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hitoshi Koizumi: "Photoinduced Isomerization of Alkyl Radicals Trapped in Solid Alkanes" The Journal of Physical Chemistry. 98. 11089-11093 (1994)
Hitoshi Koizumi:“固体烷烃中烷基自由基的光诱导异构化”物理化学杂志。
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小笠原正明: "光および放射線によってDSP結晶に誘起される重合反応の機構" 京都大学原子炉実験所第30回学術講演会報文集. 137-142 (1996)
Masaaki Ogasawara:“光和辐射在DSP晶体中诱导聚合反应的机制”京都大学反应堆研究所第30届学术会议记录137-142(1996)。
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H.Koizumi,T.Ichikawa,H.Yoshida,H.Namba,M.Taguchi: "Effect of Radiation Quality on Radical Formation in Ion-Irradiated Solid Alanine" JAERI TIARA Annual Report. 4. 59-61 (1995)
H.Koizumi、T.Ichikawa、H.Yoshida、H.Namba、M.Taguchi:“辐射质量对离子辐照固体丙氨酸自由基形成的影响”JAERI TIARA 年度报告。
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Yasuyuki Takenaka: "Crystal Structure Determination of Organic Microcrystals" Acta Crystallographica A. 4. C-25- (1996)
Yasuyuki Takenaka:“有机微晶的晶体结构测定”Acta Crystallographa A.4.C-25- (1996)
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Masaaki Ogasawara: "Mechanism of Photo- and Ionizing Radiation-Induced Polymerization in DSP Crystals (Japanese)" Kyoto Daigaku Genshiro Jikkensho 30th Gakujutu Koenkai Hobun-Shuu. 137-142 (1996)
Masaaki Ogasawara:“DSP 晶体中光和电离辐射诱导聚合的机制(日文)”京都大学源四郎吉肯所第 30 期 Gakujutu Koenkai Hobun-Shuu。
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OGASAWARA Masaaki其他文献

Practical Guide for Teaching Assistant.
助教实用指南。
  • DOI:
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    2006
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  • 影响因子:
    0
  • 作者:
    OGASAWARA Masaaki;NISHIMORI Toshiyuki;SENAHA Eijun
  • 通讯作者:
    SENAHA Eijun
Engineering Ethics Education : Its Necessity, Objectives, Methods, Current State, and Challenges
工程伦理教育的必要性、目标、方法、现状与挑战
Reconstruction of Basic Curriculum in University and Faculty Development.
大学基础课程重建与师资队伍建设。
Class Design for Units Substantializing.
单元实体化的课堂设计。
  • DOI:
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    2006
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Takahashi;K.;Hayashi;N.;Kaminogawa;S.;Ra;C.;OGASAWARA Masaaki
  • 通讯作者:
    OGASAWARA Masaaki

OGASAWARA Masaaki的其他文献

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{{ truncateString('OGASAWARA Masaaki', 18)}}的其他基金

Development of course models and evaluation models of introductory sciences
科学入门课程模型和评估模型的开发
  • 批准号:
    16300245
  • 财政年份:
    2004
  • 资助金额:
    $ 4.67万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
On the Evaluation Method for Teaching-Activities and Achievement in Eduction of the Academic Staff in the University
高校教职工教学活动与育人成果评价方法探讨
  • 批准号:
    13610273
  • 财政年份:
    2001
  • 资助金额:
    $ 4.67万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
New Ideas of What University Undergraduate Program Ought to Be and Curricular Reform in Special Reference to the Students Majoring Science and Technology
大学本科课程应有的新理念及专门针对理工科学生的课程改革
  • 批准号:
    11610239
  • 财政年份:
    1999
  • 资助金额:
    $ 4.67万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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    524434271
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    2023
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    527802652
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    2023
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Analysis of CO2 reduction reaction by ionic liquids and single crystal electrodes
离子液体和单晶电极CO2还原反应分析
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    23K13835
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    2023
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开发用于医疗保健和绿色能源应用的单晶材料
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  • 财政年份:
    2023
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Porous Piezoelectric Single Crystal Sensors (POPSICALS)
多孔压电单晶传感器 (POPSICALS)
  • 批准号:
    EP/X018679/1
  • 财政年份:
    2023
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MRI: Track 1 Acquisition of a Single-Crystal X-ray Diffractometer to Support Primarily Undergraduate Research in the Greater Susquehanna Valley
MRI:轨道 1 采购单晶 X 射线衍射仪,主要支持大萨斯奎哈纳山谷的本科生研究
  • 批准号:
    2320461
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    2023
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Equipment: MRI: Track 1 Acquisition of a Single Crystal X-Ray Diffractometer for Structure Determination of Molecules and Materials at Primarily Undergraduate Institutions
设备: MRI:轨道 1 采购单晶 X 射线衍射仪,用于主要本科机构的分子和材料结构测定
  • 批准号:
    2320694
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