title: Synthesis and properties of hemicelluloses-based semi-IPN hydrogels.
abstract: Hemicelluloses were extracted from holocellulose of bamboo by alkaline treatment. The phosphorylated poly(vinyl alcohol) (P-PVA) samples with various substitution degrees were prepared through the esterification of PVA and phosphoric acid. A series of hydrogels of semi-interpenetrating polymeric networks (semi-IPN) composed of hemicelluloses-g-poly(acrylic acid) (HM-g-PAA) and the phosphorylated poly(vinyl alcohol) (P-PVA) were prepared by radical polymerization using potassium persulphate (KPS) as initiator. The HM-g-PAA networks were crosslinked by N,N-methylenebisacrylamide (MBA) as a crosslinking agent in the presence of linear P-PVA. FT-IR results confirmed that the hydrogels comprised a porous crosslink structure of P-PVA and HM with side chains that carried carboxylate and phosphorylate groups. SEM observations indicated that the incorporation of P-PVA induced highly porous structure, and P-PVA was uniformly dispersed in the polymeric network. The interior network structures of the semi-IPN matrix became more porous with increasing P-PVA. The TGA results showed that the thermo-decomposing temperature and thermal stability were increased effectively for intruding the chain of P-PVA. The maximum equilibrium swelling ratio of hydrogels in distilled water and 0.9 wt% sodium chloride solutions was up to 1085 g g(-1) and 87 g g(-1), respectively. The compressive strength increased with increasing the MBA/HM and P-PVA/HM ratios, and decreased with the increment of AA/HM ratio.
authors: Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: fengpeng@bjfu.edu.cn.
authors: Feng
authors: F
authors: Peng
authors: Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
authors: Ying
authors: Y
authors: Guan
authors: Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
authors: Bing
authors: B
authors: Zhang
authors: Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
authors: Jing
authors: J
authors: Bian
authors: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
authors: Jun-Li
authors: JL
authors: Ren
authors: Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
authors: Chun-Li
authors: CL
authors: Yao
authors: Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: rcsun3@bjfu.edu.cn.
authors: Run-Cang
authors: RC
authors: Sun
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis* / Q000737:chemistry*; D060326:Chemistry Techniques, Synthetic; D019245:Compressive Strength; D004355:Drug Stability; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010766:Phosphorylation; D058105:Polymerization; D011134:Polysaccharides / Q000138:chemical synthesis* / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D013696:Temperature
chemical_list: D001672:Biocompatible Materials; D020100:Hydrogels; D011134:Polysaccharides; D012492:Salts; C007916:hemicellulose
keywords: Hemicelluloses; Hydrogels; Phosphorylated poly(vinyl alcohol); Semi-interpenetrated polymer network