title: Controlled mechanical and swelling properties of urethane acrylate grafted calcium alginate hydrogels.
abstract: Vinyl group capped urethane acrylate (UA) was prepared with diisocyanate (IPDI), hydroxyethyl methacrylate (HEMA) and dimethylolpropionic acid (DMPA). The UA was grafted onto sodium alginate via free-radical polymerization with KPS/Na2SO3 as initiator and then crosslinked by Ca(2+). Grafted polymers (UA-g-CaA) were characterized by FT-IR, SEM, TGA, XRD and tension gauge. The swelling behavior was also investigated. It is found that urethane acrylate grafted calcium alginate possesses lower swelling degree and is improved in thermal stability as well as mechanical performance. The reason is that hydrophobic urethane acrylate provides alginate with physical crosslinking and forms partial crystal regions. The optimum condition for synthesis of UA-g-CaA with lower swelling degree is that weight percentage of initiator to monomer is 0.8%, mass ratio of reductant to oxidant is 0.45:1, monomer concentration is 0.0385mol/L and grafting reaction temperature is 55°C.
authors.affiliation: Institute of Polymer Science and Engineering, School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China.
authors.forename: Jichao
authors.initials: J
authors.lastname: Wang
authors.affiliation: Institute of Polymer Science and Engineering, School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China. Electronic address: yxg@fzu.edu.cn.
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Ying
authors.affiliation: Institute of Polymer Science and Engineering, School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China.
authors.forename: Jiangquan
authors.initials: J
authors.lastname: Liu
authors.affiliation: Institute of Polymer Science and Engineering, School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Polymer Science and Engineering, School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China.
authors.forename: Weiying
authors.initials: W
authors.lastname: Zhang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000464:Alginates / Q000737:chemistry*; D001704:Biopolymers / Q000737:chemistry; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D055595:Mechanical Phenomena; D015394:Molecular Structure; D011140:Polyurethanes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000180:Acrylic Resins; D000464:Alginates; D001704:Biopolymers; D006603:Hexuronic Acids; D020100:Hydrogels; D011140:Polyurethanes; C050845:urethane acrylate; D020723:Glucuronic Acid
keywords: Alginate; Biomaterials; Crystallization