Preparation of polyvinylpyrrodione microspheres by dispersion polymerization

doi:10.1007/s11458-009-0003-1

Front Chem Chin

2009, Vol. 4

Issue (1) : 83-88 https://doi.org/10.1007/s11458-009-0003-1

RESEARCH ARTICLE

Preparation of polyvinylpyrrodione microspheres by dispersion polymerization

Linfeng ZHAI(

), Tiejun SHI, Hualin WANG

School of Chemical Technology, Hefei University of Technology, Hefei 230009, China

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Abstract

The preparation of polyvinylpyrrolidone (PVP) microspheres in ethyl acetate by dispersion polymerization with N-vinylpyrrolidone (NVP) as initial monomer, poly(N-vinylpyrrolidone-co-vinyl acetate) (P(NVP-co-VAc)) as dispersant, and 2,2￠- azobisisobutyronitrile(AIBN) as initiator is reported. The influences of monomer concentration, dispersant concentration and initiator concentration on the size of PVP microspheres as well as the monomer conversion were studied. The structure and properties of PVP microspheres were analyzed. The results show that the prepared PVP microspheres have a mean diameter of 3–4 mm. With an increase in NVP concentration, the size and the molecular weight of the PVP microspheres as well as the monomer conversion all increase. With increasing P(NVP-co-VAc) concentrations, the PVP molecular weight and monomer conversion both increase while the size of the microspheres becomes smaller. As the concentration of AIBN increases, the microsphere size and monomer conversion increase whereas the PVP molecular weight decreases. The PVP prepared by dispersion polymerization has a crystal structure, and its molecular weight is lower compared to that prepared by solution polymerization.

Keywords polyvinylpyrrolidone microsphere dispersion polymerization preparation

Corresponding Author(s): ZHAI Linfeng,Email:zhai-lf@sohu.com

Issue Date: 05 March 2009

Cite this article:

Linfeng ZHAI,Tiejun SHI,Hualin WANG. Preparation of polyvinylpyrrodione microspheres by dispersion polymerization[J]. Front Chem Chin, 2009, 4(1): 83-88.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-009-0003-1
https://academic.hep.com.cn/fcc/EN/Y2009/V4/I1/83

Fig.1 Effect of initial monomer concentration on the size of PVP particles
[Dispersant] = 2 wt%; [AIBN] = 0.75 wt%; Temperature= 70°C. 20 wt%;25 wt%; 30 wt%

Fig.2 Conversion vs time with various NVP monomer concentrations
[Dispersant] = 2 wt%; [AIBN] = 0.75 wt%; Temperature= 70°C

Tab.1 Effect of concentration of monomer, dispersant and initiator on of PVP

Fig.3 Effect of dispersant concentration on the size of PVP particles
[PVP] = 25 wt%; [AIBN] = 0.75 wt%; Temperature= 70°C
1.75 wt%; 1.5 wt%; 1.0 wt%

Fig.4 Conversion vs time with various dispersant concentration
[PVP] = 25 wt%; [AIBN] = 0.75 wt%; Temperature= 70°C

Fig.5 Effect of initiator concentration on the size of PVP particles
[PVP] = 25 wt%; [Dispersant] = 2 wt%; Temperature= 70°C
0.5 wt%; 1.0 wt%; 1.25 wt%

Fig.6 Conversion vs time with various initiator concentration
[PVP] = 25 wt%; [Dispersant] = 2 wt%; Temperature= 70°C

Fig.7 FT-IR spectra
NVP; PVP

Fig.8 XRD spectra of PVP

Fig.9 DSC curve of PVP

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