CAJ | 학술논문

采用一种不含有机溶剂的聚酰胺酸上浆剂实施上浆处理,为在T300级炭纤维(3 k)表面制备聚酰亚胺( PI)涂层提供一种绿色途径。通过傅里叶变换红外光谱和扫描电子显微镜对PI涂覆炭纤维的表面进行分析,结果表明,在炭纤维表面形成一层连续且均一的PI涂层。通过热重分析和单丝拉伸测试,考察炭纤维的热稳定性。与包含环氧上浆剂的炭纤维相比,在耐高温树脂的加工温度范围(300~400℃)内PI涂覆炭纤维表现出优异的热稳定性,起始分解温度与5%热失重温度分别高达567℃及619℃。此外,在空气中、400℃条件下氧化1 h后,PI涂覆炭纤维的拉伸强度仅下降6%,明显低于包含环氧上浆剂炭纤维(拉伸强度下降22%)。
채용일충불함유궤용제적취선알산상장제실시상장처리,위재T300급탄섬유(3 k)표면제비취선아알( PI)도층제공일충록색도경。통과부리협변환홍외광보화소묘전자현미경대PI도복탄섬유적표면진행분석,결과표명,재탄섬유표면형성일층련속차균일적PI도층。통과열중분석화단사랍신측시,고찰탄섬유적열은정성。여포함배양상장제적탄섬유상비,재내고온수지적가공온도범위(300~400℃)내PI도복탄섬유표현출우이적열은정성,기시분해온도여5%열실중온도분별고체567℃급619℃。차외,재공기중、400℃조건하양화1 h후,PI도복탄섬유적랍신강도부하강6%,명현저우포함배양상장제탄섬유(랍신강도하강22%)。
Organic, solvent-free polyamic acid sizing was coated onto T300 grade carbon fibers (3k) to prepare a polyimide (PI) coating having a high thermal stability and oxidative resistance. The surface of PI-coated carbon fibers was characterized by FTIR and SEM. The mechanical strength of the carbon fibers, thermal stability and oxidative resistance of the coating were also investiga-ted. Results indicate that a continuous and uniform PI coating is formed on the surface of the carbon fibers. Compared to a carbon fiber coating with epoxy, the PI coating produces excellent thermal stability with onset decomposition and a 5% weight-loss tempera-tures of 567 and 619 ℃, respectively. The tensile strength of PI-coated carbon fibers after thermal oxidation in air at 400 ℃ for 1 h has only a slight decrease of 6%, which is significantly lower than the decrease of 22% for epoxy-coated fibers.