The Synthesis And Performance Of Degradable Polyurethane Hybrid Materials With Low Surface Energy

Degradable composite materials for marine antifouling coating have attracted great attentions for the entire world. polyurethane materials with excellent mechanical properties, freedom molecular design and tunable properties was widely used in various fields. Good mechanical and antibacterial properties of graphene are also can be used for preparing antibacterial organic/inorganic hybrid low surface energy biodegradable polyurethane composite materials. Specific research contents of this paper are as follows:(1)Firstly, G-g-PLLA prepolymer is synthesized via ring-opening(ROP)polymerization of LLA using phenol-functionalized graphene(G-f-OH) and tin octoate(Sn(Oct)2) as initiator and catalyst respectively, followed by chain extension reaction of 1,4-butane diol(1,4-BDO) and4,4’-diphenylmethane diisocyanate(4,4’-MDI) to prepare NCO-terminated polyurethane. Finally, a series of degradable polyurethanes were designed and synthesized using OH-terminated poly(L-lactide)-functionalized graphene and NCO-terminated polyurethane. covalent chemical functionalization of graphene is favorable to Improve the strength of the target material, and play a role in the degradation process. on the other hand,the degradation rate and hydrophilicity/hydrophobicity of polyurethane is controllable via adjusting the mass ratios of graphene(G) and L-lactide(LLA), so as to effectively control the antifouling property of polyurethane.(2)Polyurethane with low surface energy was prepared by chain extension reaction of BDO, 4,4 ’- MDI and hydroxyl polydimethyl siloxane(PDMS), followed by condensation reaction with OH-terminated poly(L-lactide)-functionalized graphene. the contact angle and surface free energy of polyurethane is controllable via adjusting the mass content of PDMS to effectively control the antifouling property of polyurethane.Further, we will discuss the relationship of degradable property,surface energy, contact angle, hydrophilic property and antifouling property,so that we can provide clear evidence for produce more environmental and degradable marine antifouling copolymer materials.