Preparation and properties of room temperature vulcanized silicone rubber based on rosin-grafted polydimethylsiloxane†,RSC Advances

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Preparation and properties of room temperature vulcanized silicone rubber based on rosin-grafted polydimethylsiloxane†
RSC Advances ( IF 3.9 ) Pub Date : 2018-04-19 00:00:00 , DOI: 10.1039/c7ra13672b
Qiaoguang Li ₁ , Xujuan Huang ₁ , He Liu ₁ , Shibin Shang _{1,

2} , Zhanqian Song _{1,

2} , Jie Song ₃

Affiliation

Rosin-grafted polydimethylsiloxane (RGSO) was prepared via ring-opening reaction of glycidyl ester of rosin acid (ER) with hydroxy-terminated amino polydimethylsiloxane (PDMS). The structure of RGSO was confirmed by ¹H and ¹³C 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.

中文翻译：

松香接枝聚二甲基硅氧烷室温硫化硅橡胶的制备及性能†

松香接枝聚二甲基硅氧烷 (RGSO) 是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) 的开环反应制备的。RGSO 的结构由¹ H 和^13确认C 核磁共振波谱。采用凝胶渗透色谱法和旋转流变仪研究了ER对RGSO相对分子量和流变学性质的影响。然后，使用RGSO、羟基封端的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。松香改性硅橡胶表现出显着改善的热性能和机械性能。对应于 10% 重量损失和最大重量损失率的温度分别增加了 66°C 和 177°C。此外，拉伸强度和断裂伸长率分别提高了 138% 和 113%。

更新日期：2018-04-19

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