Abstract:

Associated polymers were synthesized in supercritical carbon dioxide by precipitation copolymerization of acrylic acid with different amounts of octadecyl acrylate or vinyltrimethoxysilane. The morphology, composition and solution properties of the copolymer were studied with scanning electron microscopy (SEM), FT-IR, titration, rotational viscometerSEM measurement indicated that the diameter of the primary particle was less than 1 μmThe viscosity of poly (AA-co-VTEOS) was higher than that of poly (AA-co-ODA) when the ratio of VTEOS in copolymer was less than 1%(mol).It indicated that chemical reaction with VTEOS can increase solution viscosity at a low VTEOS content in copolymerThe viscosity of poly(AA-co-VTEOS) was 2400 mPa·s when VTEOS content in copolymer was 0.2%(mol).

Key words: 超临界二氧化碳, 疏水缔合聚合物, 疏水缔合作用, 表观黏度

摘要：

在超临界二氧化碳介质中，通过自由基沉淀聚合反应合成了一系列不同乙烯基三乙氧基硅烷（VTEOS）、丙烯酸十八酯（ODA）含量的丙烯酸疏水缔合丙烯酸聚合物。采用扫描电镜、红外光谱、滴定法和旋转黏度计对共聚物的形貌、组成及溶液性质进行了表征。实验结果表明共聚物形貌是由直径小于1 μm左右的球形颗粒组成。在疏水单体含量小于1%(mol)时，VTEOS疏水改性聚合物的黏度大于ODA疏水改性聚合物的黏度。在VTEOS含量为0.2%(mol)时，通过硅氧烷间化学反应，硅氧烷改性丙烯酸聚合物溶液黏度达到2400 mPa·s。

关键词: 超临界二氧化碳, 疏水缔合聚合物, 疏水缔合作用, 表观黏度