Radiation-induced polymerization of styrene in the presence of additives

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Radiation-induced polymerization of styrene in the presence of additives

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- Radiation-induced polymerization of styrene in the presence of additives
- NUCLEAR TECHNIQUES Issue 9, (1996)
- 作者机构：
  
  北京大学
- 作者简介：
- 基金信息：
- DOI：
  CLC： TL62
- Published：01 September 1996
- 稿件说明：
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[1]伊敏,哈鸿飞.添加剂对苯乙烯辐射聚合的影响[J].核技术,1996(09):564-567.

Radiation-induced polymerization of styrene in the presence of additives[J]. Nuclear techniques, 1996, (9).
[1]伊敏,哈鸿飞.添加剂对苯乙烯辐射聚合的影响[J].核技术,1996(09):564-567. DOI：

Radiation-induced polymerization of styrene in the presence of additives[J]. Nuclear techniques, 1996, (9). DOI：

摘要

研究并讨论了甲醇（ＭｅＯＨ）、四氯化碳（ＣＣｌ４）和反式二苯乙烯三种添加剂对苯乙烯（Ｓｔ）辐射本体聚合反应机理的影响。实验结果表明，室温下，当添加剂浓度为１．０×１０－３－１．０×１０－１ｍｏｌ／Ｌ、剂量率为５５Ｇｙ／ｍｉｎ、总剂量为１０ｋＧｙ时，随着聚合体系中ＭｅＯＨ或ＣＣｌ４浓度增加，相应的Ｓｔ辐射聚合转化率亦增加，进而趋于平缓，所得聚苯乙烯分子量（Ｍｗ、Ｍｎ）却随之下降。而反式二苯乙烯为添加剂时结果正好相反。计算了辐照体系增殖自由基产额（ＧＲｐ），发现在ｓｔ－ＭｅＯＨ体系，ＧＲｐ随ＭｅＯＨ浓度的增加而增加，符合ＷＡＳ方程；在Ｓｔ－ＣＣｌ４体系，ＧＲｐ亦随ＣＣｌ４浓度增加而增加，但不符合ＷＡＳ方程；而Ｓｔ－反式二苯乙烯体系结果正好相反。

Abstract

The radiation-induced free radical polymerization of styrene in the presence of methanol （MeOH）

tetrachlorocarbon （CCl4）and trans-stilbene as the additives was studied over the concentration range of 1×10-3-1×10-1mol/L at dose rate of 55Gy/min and total dose of 10kGy. The experiments were done at room temperature.It was shown that the conversion rates of styrene increased appreciably with increasing MeOH and CCl4

while the molecular weight of polystyrene decreased steadily. In the case of trans-stilbene the results were opposite. The GRP at low concentrations of additives was calculated. The GRP was found to be proportional to square root of MeOH concentration in keeping with WAS equation

but in the case of CCl4 and trans-stilbene

the situations were complicated.The mechanism of polymerisation in the presence of different additives was also discussed.

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