비닐아세테이트 코텔로머의 제조 및 계면활성(I)

Abstract

1-octanethiol and vinyl acetate telomers (<TEX>$R_8S$</TEX>-nVAc) were synthesized and hydrolyzed with sodium hydroxide subsequently, 1.2-epoxyhexane was then introduced to the telomers. In addition, we prepared cotelomers of multi-alkylated nonionic surfactants with a molecular structure of xRnMA-yVA (x; hydrophobic group, y; hydrophilic group, MA; methacrylic ester, VA; vinyl alcohol, R; and alkyl group) and cross-linked with sodium tetraborate decahydrate. Their active surface properties were investigated by several techniques such as surface tension, foaming property, and emulsification power measurements. The surface tension of <TEX>$R_8S$</TEX>-8.8VA decreased without the introduction of 1.2-Epoxy hexane, and the degree of emulsification and foaming abilities of <TEX>$R_8S$</TEX>-8.8VA increased without the introduction of 1.2-Epoxy hexane. However, the differences were insignificant. The epoxy groups were attached to a <TEX>$R_8S$</TEX>-8.8VA cotelomer with a limited variation of the active surface properties. The surface tension of <TEX>$1.1R_6MA$</TEX>-8.8VA decreased after cross-linking subsequently, the degree of emulsification and foaming abilities of <TEX>$1.1R_6MA$</TEX>-8.8VA increased after cross-linking. However, there was no clear difference between them. The B-O bonds were attached to a <TEX>$1.1R_6MA$</TEX>-8.8VA cotelomer with a limited variation of the active surface properties.