ABSTRACT

Silicone rubber-polyarylacetylene-carbon woven laminates (SRWL) with two-dimensional structure were prepared using needled technique. The ablation and insulation mechanism of SRWL were investigated by oxyacetylene flame system, equilibrium swelling technique, thermogravimetry (TG), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results showed that the molecular weight between the crosslinks of the interlaminar complex is reduced with the increasing of the content of polyarylacetylene (PA). SRWL with PA has superior anti-ablation properties and high residue compared with that of without PA. With the increasing of PA content, the linear ablation rate of SRWL first decreases and then increases. When the content of PA is 10 phr, the linear ablation rate is 0.0276 mm s⁻¹ and the back-face temperature peak is 71 °C. SRWL filled with 10 phr concentration of PA show comparably improved ablation properties and PA hinders the thermal transmission because of forming of compactly integrated self-protection refractory layer, ceramic compounds such as SiC, Si and some endothermic behaviour.

摘要

使用针刺技术制备了二维结构的硅橡胶-聚芳乙炔-碳编织层压板（SRWL）。采用氧乙炔火焰体系、平衡溶胀技术、热重法(TG)、扫描电子显微镜(SEM)和X射线衍射(XRD)等方法研究了SRWL的烧蚀和绝缘机制。结果表明，随着聚芳乙炔(PA)含量的增加，层间复合物交联之间的分子量降低。与不含 PA 的 SRWL 相比，含 PA 的 SRWL 具有优异的抗烧蚀性能和高残留。随着PA含量的增加，SRWL的线性消融率先降低后增加。当PA含量为10 phr时，线性烧蚀率为0.0276 mm s ^-1背面温度峰值为71°C。填充 10 phr 浓度 PA 的 SRWL 显示出相对改善的烧蚀性能，并且 PA 由于形成紧密集成的自保护耐火层、陶瓷化合物（如 SiC、Si）和一些吸热行为而阻碍了热传递。