KINETICS AND MECHANISM OF PHOTOINDUCED POLYMERIZATION BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE

WANG Xiuzhi; LI Miaozhen; CHANG Zhiying; WANG Erjian

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KINETICS AND MECHANISM OF PHOTOINDUCED POLYMERIZATION BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE

Papers | Updated：2021-06-21

- KINETICS AND MECHANISM OF PHOTOINDUCED POLYMERIZATION BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE
- Vol. 11, Issue 1, Pages: 26-30(1993)
- Affiliations：
  
  1. Institute of Photographic Chemistry, Academia Sinica,Beijing,100101
  2.   Academia Sinica
  3.   Beijing
  4.   100101
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：20 March 1993
- Accepted：
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[1]汪秀智,李妙贞,常志英,王尔(钅监).KINETICS AND MECHANISM OF PHOTOINDUCED POLYMERIZATION BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE[J].Chinese Journal of Polymer Science,1993,{4}(01):26-30.

WANG Xiuzhi, LI Miaozhen, CHANG Zhiying, et al. KINETICS AND MECHANISM OF PHOTOINDUCED POLYMERIZATION BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE[J]. 1993, 11(1): 26-30.
[1]汪秀智,李妙贞,常志英,王尔(钅监).KINETICS AND MECHANISM OF PHOTOINDUCED POLYMERIZATION BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE[J].Chinese Journal of Polymer Science,1993,{4}(01):26-30. DOI：

WANG Xiuzhi, LI Miaozhen, CHANG Zhiying, et al. KINETICS AND MECHANISM OF PHOTOINDUCED POLYMERIZATION BY α,α-DIMETHOXY-α-PHENYL ACETOPHENONE[J]. 1993, 11(1): 26-30. DOI：

摘要

正

α-dimethoxy-α-Phenyl acetophenone （DMPA） is an efficient and thermally stable photoinitiator. Here its spectral characteristics in the transient state were shown. The transient species were identified as a benzoyl radical and a dimethoxyi benzyl radical that played a primary initiation role in polymerization. The kinetics and mechanism of the bulk polymerization of MMA were investigated. The exponent of DMPA concentration and k

1/2

value were found to be 0.5 and 0.066 mol（-1/2）l

1/2

-1/2

respectively. The existence of oxygen led to obtain the polymer with higher molecular weight

which can be attributed to the occurrence of the subsequent polymerization induced by active polymer end group. In the photocrosslinking reaction

the dependence of DMPA content on initial rate has been found. A principal reason is that the sample contained higher percentage of DMPA has higher light-absorbed efficiency. In solid film

higher concentration of DMPA is permitted to be used because there is little excited state self-quenching effect in the rigid medium.

Abstract

1/2

value were found to be 0.5 and 0.066 mol（-1/2）l

1/2

-1/2

respectively. The existence of oxygen led to obtain the polymer with higher molecular weight

which can be attributed to the occurrence of the subsequent polymerization induced by active polymer end group. In the photocrosslinking reaction

the dependence of DMPA content on initial rate has been found. A principal reason is that the sample contained higher percentage of DMPA has higher light-absorbed efficiency. In solid film

higher concentration of DMPA is permitted to be used because there is little excited state self-quenching effect in the rigid medium.

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