STUDIES ON THE KINETICS OF GEL FORMATION IN POLYURETHANE ACRYLATE CURED BY UV-RADIATION

Ge Jiaxin; Wang Minjun; Ma Ruide

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STUDIES ON THE KINETICS OF GEL FORMATION IN POLYURETHANE ACRYLATE CURED BY UV-RADIATION

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- STUDIES ON THE KINETICS OF GEL FORMATION IN POLYURETHANE ACRYLATE CURED BY UV-RADIATION
- Journal of Radiation Research and Radiation Processing Vol. 10, Issue 3, Pages: 174-178,134(1992)
- 作者机构：
  
  1.上海交通大学，上海
  2.上海科技大学，上海
- 作者简介：
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Ge Jiaxin, Wang Minjun, Ma Ruide. STUDIES ON THE KINETICS OF GEL FORMATION IN POLYURETHANE ACRYLATE CURED BY UV-RADIATION. [J]. Journal of Radiation Research and Radiation Processing 10(3):174-178,134(1992)
DOI：

Ge Jiaxin, Wang Minjun, Ma Ruide. STUDIES ON THE KINETICS OF GEL FORMATION IN POLYURETHANE ACRYLATE CURED BY UV-RADIATION. [J]. Journal of Radiation Research and Radiation Processing 10(3):174-178,134(1992) DOI：

摘要

采用丙烯酸酯聚氨酯和二苯甲酮／安息香乙醚复合光敏剂，对该体系紫外光固化反应的凝胶生成动力学进行分析。用红外光谱定量测定光聚合过程的变化，发现光聚合反应主要是以双键打开，交联为特征的，并得出1408 cm,-1,双键吸收峰随光照时间而变化的关系式：P,c=c,=0.325 t,0.135,。临界凝胶点可由双键反应程度与凝胶分数之间关系外推得到，凝胶点后，体系中存在一个凝胶与溶胶之间分配关系，此时凝胶与溶胶共存，凝胶中双键反应程度P,A（g）,>,总双键反应程度P,A,>,溶胶中双键反应程度P,A(S),。随着凝胶增加，P,A,和P,A(g),逐渐上升，而P,A(S),下降。此体系的紫外固化实验工作曲线与理论值基本一致。

Abstract

In this paper, the kinetics of gel formation in polyurethane acrylate initiated by UV-radiation was investigated with the help of IR spectra, in which benzophenone/benzoin ethyl ether was a mixed photosensitizer. The reaction degrees of double-bonds changing at 1408 cm,-1, of acrylates in IR were detected in the different UV exposure time. The relationship between reaction degree P,C=C, and radiation time was established as follows: P,C=C,=0.325 t,0.135,. After a critical geloint,p the reaction degrees of double-bonds existed: P,C=C,(gel),>,P,C=C,>,P,C=C,(sol) and besides therewas a distributional relation between gel and sol fractions in the whole processing.The critical gel point was obtained with the extrapolation method, and its experimental gel point and the theoretical modeling one were quite close to each other. The experimental curves of P,C=C, P,C=C,(gel) and P,C=C,(sol)functions related to gel fractions were in fairly good agreement with their theoretical modeling ones in both shape and tendency.

关键词

丙烯酸酯聚氨酯动力学研究紫外固化红外光谱双键凝胶溶胶

Keywords

Polyurethane acrylateKinetic researchCured by UV-radiationIRspectraDouble-bondsGelSol

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Shanghai Applied Radiation Institute Shanghai University of Science and Technology

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