聚硅氧烷改性两亲性超支化聚酯的合成及应用

通过羟烷基硅油对端羧基超支化聚酯的改性反应，制备了聚硅氧烷改性两亲性超支化聚酯（HBPPSi），并采用红外光谱（FT-IR）和核磁共振谱（¹H-NMR）对HBPPSi的化学结构进行了表征。利用表面张力测试、动态激光光散射（DLS）和透射电镜（TEM）对HBPPSi在溶液中的自组装行为进行研究，结果表明HBPPSi在溶液界面上具有良好的自组装行为，可以在乙醇/水的混合溶剂中形成不同形态和结构的聚集体。在此基础上将HBPPSi与二甲基硅油、疏水性白炭黑等复配制得乳液消泡剂，具有良好的消泡及抑泡性能。

Preparation and application of polysiloxane-modified amphiphilic hyperbranched polyesters

A polysiloxane-modified amphiphilic hyperbranched polyester (HBPPSi) has been synthesized through the reaction between the alkyl hydroxyl end-groups of a polysiloxane and the COOH end-groups of a hyperbranched polyester, and the structure of the polymer was identified by FT-IR and ¹H-NMR. The resulting HBPPSi has good solubility in both polar solvents (such as ethanol) and non-polar solvents (such as toluene). The self-assembly behavior of the HBPPSi in ethanol/water solvents was studied by dynamic light scattering and transmission electron microscopy. The results showed that the HBPPSi could form hollow vesicles with different shapes and structures in mixed ethanol/water solvents, and a defoaming agent—which was formulated from the HBPPSi, dimethyl silicone, and hydrophobic nano-silica—showed an excellent defoaming performance.