Study Of Nylon 6 Fiber Graphene Enhanced

Nylon6is a kind of polymer synthesised by caprolactam, it is one of the most widelyused fiber. But the traditional nylon6fiber can no longer meet the needs of people; in thiscase, how to develop the high performance of nylon6fiber has aroused more and moreattention. Current research of nylon6focuses on how to obtain higher strength andmodulus. At present, high performance nylon6fiber was prepared mainly through themodification of matrix resin, introduction the nano fillers such as glass fiber, silicondioxide and montmorillonite. These methods can improve the performance of nylon6fiber.But the interfacial bond strength of nano filler and matrix is not strong, resulting in thestrength decrease of fiber. So how to develop a new kind of nano material to replace theprevious material is a big problem we all face. The emergence of graphene provides a newway for developing the high strength nylon6fiber. As a high-performance nano-materials,graphene oxide (GO) is attracting more and more attention.The main research content and conclusions are as follows:1. In this paper, graphite oxide was prepared by Hummers method, and then wassubjected to ultrasonic treatment to prepare GO. The analysis results of atomic forcemicroscope (AFM) and nano particle size instrument show that thickness of GO lamella isonly0.8nm, and equivalent diameter is about200nm. So GO is uniformly dispersed as asingle layer. From Raman spectroscopy (Roman) and Fourier IR (FT-IR), we know thestructure of GO is broken and the surface is rich in oxygen-containing functional groups, inwhich carboxyl is the basis for the growth of nylon6grafting.2. Selecting in situ polymerization method instead of the blending method, byadjusting the feed ratio of GO, modified nylon6that GO loading is0.01,0.10,0.30,0.50and1.00wt%was obtained. FT-IR and AFM characterization proves that nylon6chainshave successfully grafted onto GO sheets, and Thermo gravimetric (TG) analysis furthershows that grafting may decline with increasing content of GO. With increase of thecontent of GO, the melting temperature and crystallization temperatures of nylon6are firstincreased and then decreased. 3. Then we tried to select NH3and H2N(CH2)6NH2to modify GO to form GO-NH2,GO(CH2)6NH2, then the amine groups reacted with CPL or PA6to connect to GO sheets.Amine groups ended graphene can favour chain propagation, and because GO-(CH2)6NH2has longer molecular chain plus good disparity in CPL melt, longer chain PA6graftedgraphene and higher conversion of CPL to PA6were achieved.4. In addition, modified nylon6fiber was obtained by the melt spinning method, thenstretched and wound. Tests show that GO-(CH2)6NH2has an excellent reinforcement tonylon6, and when the content of GO-(CH2)6NH2is0.10%, the tensile strength is the best.