Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles <italic style="font-style: italic">via</italic> Precipitation Polymerization

Peng Cui; Chang-Tong Song; Xian-Hong Zhang; Dong Chen; Yu-Hong Ma; Wan-Tai Yang

doi:10.1007/s10118-019-2252-x

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Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles via Precipitation Polymerization

ARTICLE | Updated：2021-02-18

- Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles via Precipitation Polymerization
- Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles via Precipitation Polymerization
- Chinese Journal of Polymer Science 2019年37卷第7期页码：646-653
- Affiliations：
  
  a.State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  b.College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  xhzhang@mail.buct.edu.cn (X.H.Z.)
  yangwt@mail.buct.edu.cn (W.T.Y.)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 51521062).
- DOI：10.1007/s10118-019-2252-x
  中图分类号：
- 收稿：2019-01-16，
  
  修回：2019-3-5，
  
  录用：2019-3-8，
  
  网络首发：2019-04-04，
  
  纸质出版：2019-07
- Accepted：
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Citation: Cui, P.; Song, C. T.; Zhang, X. H.; Chen, D.; Ma, Y. H.; Yang, W. T. Preparation of ultralow molecular weight poly(vinyl chloride) with sub-micrometer particles via precipitation polymerization. Chinese J. Polym. Sci. 2019, 37, 646–653

Peng Cui, Chang-Tong Song, Xian-Hong Zhang, et al. Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles via Precipitation Polymerization[J]. Chinese Journal of Polymer Science, 2019, 37(7): 646-653. DOI: 10.1007/s10118-019-2252-x.
Citation: Cui, P.; Song, C. T.; Zhang, X. H.; Chen, D.; Ma, Y. H.; Yang, W. T. Preparation of ultralow molecular weight poly(vinyl chloride) with sub-micrometer particles via precipitation polymerization. Chinese J. Polym. Sci. 2019, 37, 646–653 DOI： 10.1007/s10118-019-2252-x.

Peng Cui, Chang-Tong Song, Xian-Hong Zhang, et al. Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles via Precipitation Polymerization[J]. Chinese Journal of Polymer Science, 2019, 37(7): 646-653. DOI: 10.1007/s10118-019-2252-x. DOI：

摘要

Abstract

Poly(vinyl chloride)

with ultralow molecular weight

produced by free radical polymerization either at high temperature or in the presence of chain transfer agents

is widely used as special resins and polymer process additives. This paper reports a new process

called self-stabilized precipitation polymerization

in which the polymerization of vinyl chloride monomer (VCM) is conducted in hydrocarbon diluents without addition of any suspending agent or emulsifier. The merits of this novel strategy include: (1) PVC resins with ultra-low number-average molecular weight (

) from 4000 to 15000

which is much lower than

of those prepared by conventional suspension and emulsion polymerizations

(2) sub-micrometer PVC particles with near spherical morphology

and (3) the very simple post-polymerization separation process. Under mild stirring

polymerization proceeds stably and smoothly. The influences of main process factors

such as solvents

initiator and monomer concentrations

polymerization time

and temperature on both particle morphology and

of the polymer products are investigated systematically. The molar ratio of ―CH

―CHCl―/―CH＝CH―CH

CHCl

a good indicator of structural defects

is about 1000/0.1 which means the low molecular weights do not result from chain transfer to the monomers. Then the mechanism of this polymerization is proposed. In summary

this novel polymerization technology provides a straightforward method for preparing PVC particulate products with low

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Keywords

references

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Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles via Precipitation Polymerization

Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Sub-micrometer Particles via Precipitation Polymerization

DOI：10.1007/s10118-019-2252-x

摘要

Abstract

关键词

Keywords

references