摘要
纺织结构碳纤维增强尼龙6（CFF/PA6）复合材料的力学性能优于短、长纤增强材料,但成型加工较困难。文中提出一种基于碳纤维（CF）表面改性的CFF/PA6成型方法,研究了多种CF表面改性处理法及模压成型压力对材料力学性能的影响。发现在氮气氛围中400℃高温处理4h可有效去除CFF表面浆料,通过饱和的尼龙/甲酸溶液处理24h可使CF表面活化、与PA6形成氢键,并使PA6以黏度较低的溶液状态渗透CFF丝束内部,孔隙率从8.05%降至0.81%。进而采用薄膜叠层模压法制备CFF/PA6,在250℃,2.5~3.0 MPa下加载10min,所得材料的拉伸强度、弯曲强度和冲击强度分别达到464.48 MPa,698.47 MPa和95.3kJ/m2,较未经表面处理的材料提高40%~50%。利用扫描电子显微镜可以看到,所制备的复合材料具有良好的基体-增强体浸润性和较强界面。
Carbon fiber fabric reinforced nylon 6（CFF/PA6）composites show more excellent mechanical properties when compared with short or long fibers reinforced composites.However,these kind of composite materials are difficult to be processed.In this study,an efficient way was proposed to produce CFF/PA6 composites based on modifications of carbon fibers（CF）.The influence of modification methods and pressures in molding process on mechanical properties for CFF/PA6 was investigated.It is found that the sizing agents coated on surface of CF could be removed when CFF is annealed at 400℃in nitrogen for 4h.After immersing the annealed CFF into saturated formic acid solution of PA6,surfaces of CF are activated and hydrogen bonds would be formed between CF and PA6.At the same time,PA6 could easily permeate into CFF at rather low viscosity,resulting in a decrease of porosity from 8.05%to 0.81%.In the subsequent molding method in hot press,preferred processing conditions are suggested to be at 250℃,under 2.5~3.0MPa and for 10 min.Materials of CFF/PA6 composites processed by these methods exhibit a tensile strength of 464.48 MPa,a flexural strength of 698.47 MPa,and an impact strength of 95.3kJ/m2,which show an increases of 40%~50% compared with the composites without surface modifications.Scanning electron microscopy（SEM）observations imply good wettability and enhanced interfaces between matrix and reinforcement.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第10期92-98,共7页
Polymer Materials Science & Engineering
基金
国家自然科学基金青年科学基金项目(21404023)
上海市科学技术委员会科研计划项目(12521102300
12dz1100502)
