氨基化石墨烯改性水性聚氨酯合成及性能研究

Study on Preparation and Performance of Waterborne Polyurethane Modified by APTMS-GO

摘要:

用3-氨丙基三甲氧基硅氧烷(APTMS)插层改性氧化石墨烯(GO)得到氨基化石墨烯(APTMS-GO),通过FT-IR、XRD、Raman、TG、TEM、XPS表征出APTMS-GO的结构和形态。将APTMS-GO与带有异氰酸根的聚氨酯预聚物以原位聚合的方式聚合，制备了0-0.55wt%含量APTMS-GO的APTMS-GO/WPU复合材料，测试了其拉伸性能、热学性能、疏水性的变化；利用FE-SEM和TEM观察了截面中纳米填充物的分散情况以及乳液的粒径。结果表明：通过原位聚合得到的复合材料的拉伸强度得到了明显改善，由原来的10.13Mpa增加到28.96Mpa，当APTMS-GO含量为0.22wt%，复合聚氨酯的初始分解温度(Td5)从245℃增大到279℃，随着APTMS-GO含量的逐步增大，复合膜的接触角由71.3°提高到91.28°，实现了分子结构中疏水性作用的改善与提高。

Abstract:

3-aminopropyltrimethoxysilane, as a kind of modifier, was grafted on the surface of graphene nanosheets. The morphology of this kind of APTMS-GO and its properties were investigated by FT-IR, TG, XRD, Raman, AFM and TEM, respectively. APTMS-GO was well dispersed into dispersing agent and then added to the prepolymer to get a series of hybrid emulsion by in-situ polymerization, with the addition of APTMS-GO from 0.00 to 0.55wt.%. The properties, including mechanical property, thermal properties and hydrophobicity, of the APTMS-GO/WPU films, were tested. The cross-sectional morphology and emulsion particle of nanocomposites were also observed by FESEM and TEM, respectively. The results indicated that tensile properties of this hybrid film incorporated by the APTMS-GO via in-situ polymerization were significantly improved, with the tensile strength increasing from 10.13MPa to 28.96MPa. Thermal properties showed that adding 0.22wt.% APTMS-GO into the polymer matrix could enhance the initial thermal degradation(5% weight loss) temperature from 245 to 279oC. Hydrophobicity tests indicated that water contact angle (WCA) of the composite increased from 71.3° to 91.28° with increase in APTMS-GO content of the hybrid emulsion.