Polyvinyl Alcohol Collagen Composite Fiber Is Worth Studying.

The research of high performance polyvinyl alcohol and collagen composite fiber should start with the molecular structure of polyvinyl alcohol and collagen. Polyvinyl alcohol meets the requirements for preparing high-performance fibers: first, the molecular chain is in an extended chain conformation, and the number of molecules is arranged in a unit area; two is the synthesis of ultra high molecular weight polyvinyl alcohol (PVA); the three is the strong interaction force between the molecular chains, and the high crystallinity; four is alkyl and large amount of hydroxyl, which has emulsification function and is easy to add functional modifiers to make functionalization.

The main chain of polyvinyl alcohol is C-C chain structure, the molecular chain cross section area is small (0.228nm2), the side group has a large number of hydroxyl groups (38.6%), the dissociation energy of the bond in the chain is 25 ~ 314KJ/mol, the mechanical damage can be 250KJ/mol, the intermolecular interaction energy is 38 ~ 42KJ/mol, the cohesive energy density is 159CED, the fiber theoretical strength and modulus are 210cN/dtex and 2003cN/dtex, second only to PE fiber. The molecular structure of PVA is characterized by high molecular weight, high regularity and high alcoholysis. Its spinning technology includes dry wet process, gel spinning, wet spinning, high tension drawing, crystallization and heat setting.

　　 Ultra high molecular weight The synthesis of PVA is a problem worth studying. The super high molecular weight PVA prepared by emulsifier free emulsion polymerization has the advantage of avoiding the effect of emulsifier on fiber crystallization and mechanical properties. The two is to avoid the interaction between emulsifier and monomer and initiator molecules, and to make high molecular weight PVA more easily. Three, it is conducive to heat transfer and mass transfer in polymerization process. Four, the super high molecular weight PVA is prepared by alcoholysis of synthetic super high molecular weight polyvinyl acetate.

High strength PVA obtained by wet spinning of boron containing hydrogels fibre High strength vinylon was obtained by aldehyde treatment. The fiber has excellent wear resistance. The fabric contains 20% high strength polyvinylon fibers, and its resistance to flat grinding can be increased by 7.2 times and strength by 1~2 times. It can be used for training clothes, miners' tooling, fire hoses and so on. Using boride and PVA macromolecules to form cross-linked network structure in alkaline solution, the entanglement of PVA macromolecules in primary fibers can be reduced, and the post drawing multiple will be increased to obtain high strength semi-finished fibers.

Look at the molecular structure of collagen: the molecular chain of collagen contains three peptide chains. They are left handed helical conformations, forming a large three strand helix with a molecular weight of about 300 thousand. The interaction between peptide chains ensures the firmness of the helicoid. The interaction forces between the peptide chains are polar groups, which produce ionic bonds, hydrogen bonds and Fan Dehua forces. Nonpolar groups produce hydrophobic bonds and fan Edward forces.

　　 PVA The mixture of aqueous solution and collagen solution before spinning (including modifier) was obtained through polyvinyl alcohol / collagen composite fiber through spinning raw solution, static defoaming, coagulation bath, bath stretching (in coagulation bath), initial stretching, winding, dry hot drawing, heat setting, compound and acetal.

The compatibility between collagen and PVA is poor. It is necessary to modify the spinning solution with the linking agent (modifier) to improve the compatibility and the retention rate of protein in the fiber.

The breaking strength of collagen / polyvinyl alcohol composite fiber is 4.42cN/dtex, elongation at break is 12.30%, Rp is 114 C, and collagen content is 28.35%, retaining collagen characteristics.