Low Temperature, In Situ Polymerization of Vinyl Acetate in Silica Containing Emulsion Gels

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2023-01-28 DOI:10.1155/2023/7849372

Nazreen Zavahir, Tan Zhang, F. Blum, Madhubhashini Maddumaarachchi

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引用次数: 0

Abstract

Vinyl acetate (VAc) was polymerized to about 90% conversion in 9 h at 40°C from the colloidal microstructure of the VAc/fumed silica/cetyltrimethylammonium bromide (CTAB) system. The glass transition (

T_{g}

) of poly(vinyl acetate) (PVAc) polymerized in these emulsion gels with silica was higher (

T_{g} = 41^{°} C

) than those of PVAc made from bulk polymerization at 60°C (

T_{g} = 31^{°} C

) and the weight average molar mass (

M_{w}

) was also larger (

M_{w}

about 300 kg/mol) than those from bulk polymerization (

M_{w} = 125 kg / mol

). Increased

M_{w}

T_{g}

, and lowered processing temperature for these composites could facilitate new applications for PVAc.

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醋酸乙烯酯在含硅乳液凝胶中的低温原位聚合

乙酸乙烯酯（VAc）在9分钟内聚合至约90%的转化率在40°C下从VAc/气相二氧化硅/十六烷基三甲基溴化铵（CTAB）体系的胶体微观结构中分离h。在这些含有二氧化硅的乳液凝胶中聚合的聚乙酸乙烯酯（PVAc）的玻璃化转变（Tg）更高（T g=41°C）比在60°C下由本体聚合制成的PVAc（T g=31°C）和重均摩尔质量（Mw）也较大（M w约300 kg/mol）比来自本体聚合的那些（Mw＝125 kg/mol）。增加Mw，Tg和降低这些复合材料的加工温度可以促进PVAc的新应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464