Ablation and thermal insulation properties of silicone rubber-polyarylacetylene-carbonwoven laminates for solid rocket motor

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.

Preparation and ablative behaviors of carbon fiber‐reinforced polydimethylsiloxane‐co‐poly(silylene acetylenearyleneacetylene) composites

“…The cured copolymer resins show a distinct T d max in N 2 . The T d max in N 2 of the cured PPSOA‐2 resin is 572°C higher than that PDMS, which has a maximum rate of weight loss at 528°C using a heat rate of 20°C min −1 16 . It indicates that the thermal stability of the PDMS can increase with incorporation of heat‐resistant PSA segment in the copolymer.…”

“…The T d max in N 2 of the cured PPSOA-2 resin is 572 C higher than that PDMS, which has a maximum rate of weight loss at 528 C using a heat rate of 20 C min À1 . 16 It indicates that the thermal stability of the PDMS can increase with incorporation of heat-resistant PSA segment in the copolymer. The decrease in the flexibility of the PDMS main chain effectively improves the depolymerization stability of the PDMS.…”

“…The cured PAA has a highly cross‐linked aromatic polymer, high char yield of 90% and much low moisture‐absorption (0.1%–0.2%) 15 . The PAA resin has been used to increase the ablation properties and residue of the polysiloxane by blending with the polysiloxane 16 . The silanes have been introduced into polyarylacetylene resin to form a silicon‐containing polyarylacetylene resin (poly(silylene acetylenearyleneacetylene), PSA) which is a kind of organic–inorganic hybrid resin with ArC≡CSiR 2  repeating structural unit in the main chain.…”

“…15 The PAA resin has been used to increase the ablation properties and residue of the polysiloxane by blending with the polysiloxane. 16 The silanes have been introduced into polyarylacetylene resin to form a silicon-containing polyarylacetylene resin (poly (silylene acetylenearyleneacetylene), PSA) which is a kind of organic-inorganic hybrid resin with Ar C≡C SiR 2 repeating structural unit in the main chain. The PSA has excellent processing performance, highly heat-resistant and good mechanical properties compared with PAA resin.…”

Study of Elastomeric Heat Shielding Materials for Solid Rocket Motor Insulation

“…I Kingstone Lesley Jabez shows the curves of TGA of the nitrile rubber, EPDM and EPDM composite in 'figure 14' where the decomposition of the nitrile rubber and the EPDM composite is less than that of the EPDM without Kevlar [75]. Chengzhi Jiang shows the TGA curve of silicone rubber composition 'figure 15' [76].…”