【摘要】 以经过硅烷偶联剂表面改性的纳米S iO2为种子,制备了纳米S iO2/聚丙烯酸酯复合乳液及其涂层;FT-IR分析表明,纳米S iO2/聚丙烯酸酯复合涂层兼具纳米S iO2和聚丙烯酸酯涂层的特征吸收峰;热分析结果表明,加入质量分数为3%的纳米S iO2后热分解速率最大的温度(413℃)比聚丙烯酸酯(350℃)提高了60℃以上;通过计算得到S iO2质量分数为3%样品的热降解活化能为298.40 kJ/mol,比纯聚丙烯酸酯增加了90 kJ/mol。更多还原

【Abstract】 Nano-SiO₂/acrylic resin composite latex was synthesized in the presence of nano-SiO₂,which was modified by silane coupling agent.The FT-IR analysis showed that the spectrum of the composite latex had all the characteristic bands of nano-silica and pure polyacrylate latex.The thermal analysis showed that the addition of nano-SiO₂ raised the rigidity of acrylic molecules,generated cross linkage and induced the free radical from the thermal degradation,which improved the thermal stability of the composite latex.The thermal degradation activation energy of 3% ω(SiO₂) is 298.40 kJ/mol,which quantitatively explains the improvement of the thermal stability after the addition of nano-SiO₂.更多还原