Preparation And Characterization Of Novel Graft Copolymers Of LLDPE

Two kinds of functional monomers were synthesized, and two kinds of grafted copolymers were prepared by using the surfactants and linear low density polyethylene as starting materials. The grafting reaction was carried out by using melt reactive extrusion procedure.The first kind of functional monomer was synthesized by using allyl chloride, phenol, phenyl amines and formaldehyde as the main starting materials. The effect of some factors on the yield was investigated. The chemical structures were characterized by means of FTIR and NMR. Allyl-functional benzoxazine was adopted as the grafting monomer of LLDPE, and grafting reaction was carried out by using melt reactive extrusion procedure. Their thermal properties of grafted copolymers were studied by using DSC, and their surface properties were characterized by measuring contact angle, XPS, WAXD. The rheological properties were studied by using rotational rheometer. It was found that the crystallization temperature and crystallization degrees of grafted copolymers were higher than that of the plain LLDPE, the hydrophobic property of the grafted copolymers was proved better than the plain LLDPE, and the viscosity of the grafted copolymers was reduced.The second kind of monomer was synthesized by using perfluorooctane poly(ethylene oxide) ether and acryloyl chloride as the main starting materials. Their chemical structures were characterized by means of FTIR and NMR. The fluorine surfactant was adopted as the grafting monomer of LLDPE, and grafting reaction was carried out by using melt reactive extrusion procedure. Their thermal properties of grafted copolymers were studied by using DSC, their surface properties were characterized by measuring contact angle, XPS and WAXD. The rheological properties were studied by using rotational rheometer. It was found that the crystallization temperature and crystallization degrees of grafted copolymers were higher than that of the plain LLDPE, the hydrophobic property of the grafted copolymers was proved better than the plain LLDPE, and the viscosity of the grafted copolymers was reduced.