EFFECT OF HYDROGEN RADICAL SCAVENGER ON ULTRASONICALLY INITIATED EMULSION POLYMERIZATION OF STYRENE

NIE Min; WANG Qi; QIU Guihua

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EFFECT OF HYDROGEN RADICAL SCAVENGER ON ULTRASONICALLY INITIATED EMULSION POLYMERIZATION OF STYRENE

Research Article | 更新时间：2021-03-19

- EFFECT OF HYDROGEN RADICAL SCAVENGER ON ULTRASONICALLY INITIATED EMULSION POLYMERIZATION OF STYRENE
- Acta Polymerica Sinica Issue 7, Pages: 633-637(2007)
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- Published：20 July 2007，
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NIE Min, WANG Qi, QIU Guihua. EFFECT OF HYDROGEN RADICAL SCAVENGER ON ULTRASONICALLY INITIATED EMULSION POLYMERIZATION OF STYRENE. [J]. Acta Polymerica Sinica (7):633-637(2007)
DOI：

NIE Min, WANG Qi, QIU Guihua. EFFECT OF HYDROGEN RADICAL SCAVENGER ON ULTRASONICALLY INITIATED EMULSION POLYMERIZATION OF STYRENE. [J]. Acta Polymerica Sinica (7):633-637(2007) DOI：

摘要

研究了微量CCl4对超声引发苯乙烯乳液聚合的影响.随着CCl4含量增加

聚合速率先增加后降低.在CCl4存在下H2O2产率增加

pH值与所得聚合物分子量降低和无挥发性氢自由基捕捉剂对超声引发苯乙烯乳液聚合的影响表明了CCl4使超声引发苯乙烯乳液聚合速率提高的原因在于CCl4能进入空化泡内捕捉氢自由基

使反应体系的自由基浓度增高.但在超声引发甲基丙烯酸甲酯乳液聚合体系中

甲基丙烯酸甲酯较大的蒸汽压减少CCl4对氢自由基的捕捉几率

因此CCl4的加入没能提高甲基丙烯酸甲酯的聚合反应速率.

Abstract

Ultrasonically initiated emulsion polymerization of styrene was carried out in the presence of the volatile hydrogen radical scavenger CCl4. With addition of CCl4 the polymerization rates first increased and then decreased.The increase of H2O2' yield and the decrease of pH and the produced polystyrene's molecular weight in the presence of CCl4

and the effect of non-volatile hydrogen radical scavenger on ultrasonically initiated emulsion polymerization of styrene indicates that the observed enhancement can be explained as follows.CCl4 may enter cavitation bubbles and further react with hydrogen radicals (·H) from the sonolysis of water to produce new radicals ·CCl3

so as to reduce the recombination of ·H and ·OH.Therefore more radicals would be present in the systems for initiating polymerization.In addition

the effect of CCl4 on ultrasonically initiated emulsion polymerization of methyl methacrylate(MMA) was studied.The results showed that CCl4 did not significantly enhance the ultrasonically initiated emulsion polymerization rate of MMA due to high vapor pressure and solubility of MMA

which would reduce the efficiency of CCl4 scavenging ·H.

关键词

氢自由基捕捉剂超声波乳液聚合四氯化碳

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