1、Poly-benzoxazine resin(PBR)with a unique N,O six-mem-bered heterocyclic structure,had a potential application in thefield of aerospace due to its low expansion coefficient,highweather resistance,high carbon yield,good mechanicalstrength,and excellent ablation resistance1.In this work,PBRwas incorpor
2、ated into nitrile rubber(NBR)to obtain PBR/NBRcomposites,and the ablation resistance and thermal insulationof the PBR/NBR composites were investigated.The formulationof rubber compounds was NBR 100 phr(mass,the same below),4010 NA 2.0 phr,zinc oxide 2.0 phr,SA 2.4 phr,CZ 2.2 phr,sulfur 1 phr and PBR
3、 varies.And the samples were named as PX/NBR,where X stood for the amount of PBR.Fig 1Thelinearablationrateandthermal conductivityof PBR/NBRnanocomposites,andtheappearanceof NBR(b)andPBR/NBRnanocomposites(c)afterablationAs shown in Fig 1(a),with the increasing amount of PBR,the linear ablation rate
4、and thermal conductivity of PBR/NBRnanocomposites decreased.The linear ablation rate and ther-mal conductivity of PBR/NBR nanocomposites with 60 phrPBR arrived at 0.023 mm/s and 0.169 W/(mK),respectively,suggesting PBR was a thermally stable and char-producingpolymeric material2.Compared to NBR as s
5、hown in Fig 1(b),a relatively dense char layer was found on the surface of PBR/NBRas shown in Fig 1(c),indicating that the formation ofmore dense char layer on the ablated surface had significantablation resistance.Char retention on the substrate surface afterbeing subjected to high impact force of
6、oxy-acetylene flamefurther validated the strong interaction between char and sub-strate as well as the resin network formation throughout theNBR matrix,thereby effectively preventing the intrusion of ex-ternal heat flow during the ablation period and avoiding highheat transfer to the internal struct
7、ure and reducing the ablationrate3.Moreover,the non-flammability gas induced by thedegradation of the benzoxazine resin tended to reduce the con-centration of the O2and the temperature of the surface4.Thenew ablation and thermal resistant materials had potential ap-plications in aerospace fields.研究快
8、讯Communication合成橡胶工业，2023-03-15，46（2）：153CHINASYNTHETICRUBBERINDUSTRYDual network of poly-benzoxazine/nitrile rubber composite and its ablationresistance and thermal insulation propertiesFU Quan-sheng1,WEN Yan-wei2,LOU Yang2,CHEN Meng-han1,JIA Hong-bing1*（1.Key Laboratory of Soft Chemistry and Funct
9、ional Materials of Ministry of Education,Nanjing Universityof Science and Technology,Nanjing 210094,China;2.Shanghai Institute of Aerospace ChemicalApplication,Huzhou 313000,China）Received：2022-09-28.Biography：Fu Quansheng,master student.Foundation item:Supported by Shanghai Aerospace Science andTec
10、hnology Innovation Fund Project(SAST 2022-097).*To whom all correspondences should be addressed.DOI:10.19908/ki.ISSN1000-1255.2023.02.0153苯并噁嗪树脂/丁腈橡胶复合材料双网络结构及其耐烧蚀和绝热性能付权圣1，温彦威2，楼阳2，陈梦寒1，贾红兵1（1.南京理工 大 学 软 化 学 和 功 能 材 料 教 育 部 重 点 实 验 室，江 苏 南 京210094；2.上海航天化工应用研究所，浙江 湖州313000）考察了苯并噁嗪树脂（PBR）对丁腈橡胶（NBR）耐
11、烧蚀和绝热性能的影响。结果表明，随着PBR用量的增加，PBR/NBR复合材料的线性烧蚀率和热导率下降，这主要是由于燃烧表面的炭化物和基质之间的强烈相互作用及PBR在整个NBR基体中形成的树脂网络结构阻止了外部热流的侵入，此外PBR还能生成不可燃气体阻止了基质的进一步燃烧。当PBR用量为60份（质量）时，PBR/NBR复合材料的线性烧蚀率和热导率分别达到0.023 mm/s和0.169 W/（mK）。关键词：苯并噁嗪树脂；丁腈橡胶；复合材料；耐烧蚀性；绝热性能References:1Yan Hongqiang,Sun Chuang,Fang Zhengping,et al.Synthe-sis
12、of an intrinsically flame retardant bio-based benzoxazineresinJ.Polymer,2016,97:418-427.2Zhang Kan,Hao B,Ishida H.Synthesis of a smart bisbenzox-azine with combined advantages of bismaleimide and benzox-azine resins and its unexpected formation of very high perfor-mance cross-linked polybenzoxazoleJ
13、.Polymer,2021,223:123703.3Nawaz R,Rashid N,Ali Z,et al.Effects on thermal and abla-tive properties of phenolic resin(novolac)blended acryloni-trile butadiene rubberJ.Fibers and Polymers,2018,19:1318-1326.4Zhang Xiaorui,Liu Lizhu,Yu Yang,et al.Flame-retardantmechanism of benzoxazine resin with triazine structureJ.Advances in Polymer Technology,2016,37(6):384-389.