Li Qiaoguang, Huang Xujuan, Liu He, Shang Shibin, Song Zhanqian, Song Jie
Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Key Laboratory of Biomass Energy and Material, National Engineering Laboratory for Biomass Chemical Utilization, Key and Laboratory on Forest Chemical Engineering, State Forestry Administration Nanjing 210042 Jiangsu Province China
Institute of New Technology of Forestry, Chinese Academy of Forestry Beijing 100091 China
RSC Adv. 2018 Apr 19;8(26):14684-14693. doi: 10.1039/c7ra13672b. eCollection 2018 Apr 17.
Rosin-grafted polydimethylsiloxane (RGSO) was prepared ring-opening reaction of glycidyl ester of rosin acid (ER) with hydroxy-terminated amino polydimethylsiloxane (PDMS). The structure of RGSO was confirmed by H and C NMR spectroscopy. The effects of ER on relative molecular weight and rheological properties of RGSO were studied by gel permeation chromatography and rotational rheometry. Then, room temperature vulcanized (RTV) silicone rubber modified with rosin was prepared using RGSO, hydroxy-terminated PDMS, tetraethoxysilane, and organotin catalyst. The structures and properties of RTV silicone rubbers were studied by scanning electron microscopy, thermogravimetric analysis, a universal testing machine and dynamic mechanical analysis. The rosin-modified silicone rubber showed remarkably improved thermal and mechanical properties. Temperatures corresponding to 10% weight loss and maximum rate of weight loss increased by 66 °C and 177 °C, respectively. Moreover, the tensile strength and elongation at break increased by 138% and 113%. The role of rosin structure in improvement of properties is discussed.
通过松香酸缩水甘油酯（ER）与端羟基氨基聚二甲基硅氧烷（PDMS）的开环反应制备了松香接枝聚二甲基硅氧烷（RGSO）。通过氢核磁共振谱和碳核磁共振谱对RGSO的结构进行了确认。采用凝胶渗透色谱法和旋转流变仪研究了ER对RGSO相对分子质量和流变性能的影响。然后，使用RGSO、端羟基PDMS、四乙氧基硅烷和有机锡催化剂制备了松香改性的室温硫化（RTV）硅橡胶。通过扫描电子显微镜、热重分析、万能试验机和动态力学分析对RTV硅橡胶的结构和性能进行了研究。松香改性硅橡胶的热性能和力学性能得到显著改善。对应于10%失重和最大失重速率的温度分别提高了66℃和177℃。此外，拉伸强度和断裂伸长率分别提高了138%和113%。讨论了松香结构在性能改善中的作用。
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