Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, China; School of Chemical Engineering, Southwest Forestry University, Kunming 650224, China.
Eco-development Academy, Southwest Forestry University, Kunming, Yunnan 650224, China.
Int J Biol Macromol. 2019 Jul 15;133:964-970. doi: 10.1016/j.ijbiomac.2019.04.128. Epub 2019 Apr 17.
Porous grafted copolymer with excellent thermal stability and swelling capacity was synthesized from water soluble Prunus cerasifera gum polysaccharide (PG) and acrylamide (AM). The monosaccharide compositions and the structure of Prunus cerasifera tree gum were detected by a high-performance anion exchange chromatography (HPAEC) system and H NMR and C NMR, and the obtained PG-AM copolymer was characterized by Fourier transform infrared (FT-IR), scanning electron microscope (SEM), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. The results indicated that the water soluble polysaccharides obtained from Prunus cerasifera tree gum were mainly composed of l-arabinose (39.78%) and d-galactose (40.59%) with minor amount of xylose, mannose and uronic acids. The maximum percent and the grafting efficiency of grafting acrylamide (AM) onto PG to form PG-AM were obtained by copolymerization between polysaccharide and 3 times (weight) acrylamide with 3 mmol/L potassium persulfate initiator at 50 °C for 1 h. In addition, lots of isolated and conjoint pores were observed in the prepared PG-AM materials, with a diameters distribution between 2 and 10 μm. Compared with PG, the synthesized copolymer PG-AM showed an excellent performance in thermal stability and swelling capacity. The detailed structural characteristic together with excellent thermal stability and swelling properties will benefit efficient utilization of the synthesized copolymer as a precursor for preparation of large-scale environmentally friendly advanced materials with various potential applications.
从水溶性李树胶多糖（PG）和丙烯酰胺（AM）合成了具有优异热稳定性和溶胀能力的多孔接枝共聚物。通过高效阴离子交换色谱（HPAEC）系统和 1 H NMR 和 13 C NMR 检测李树胶的单糖组成和结构，并分别通过傅里叶变换红外（FT-IR）、扫描电子显微镜（SEM）、热重分析（TGA）和差示扫描量热法（DSC）对所得 PG-AM 共聚物进行了表征。结果表明，从李树胶中获得的水溶性多糖主要由 l-阿拉伯糖（39.78%）和 d-半乳糖（40.59%）组成，还有少量的木糖、甘露糖和糖醛酸。通过多糖与 3 倍（重量）丙烯酰胺与 3 mmol/L 过硫酸钾引发剂在 50°C 反应 1 小时共聚，获得了最大接枝百分率和接枝效率。此外，在制备的 PG-AM 材料中观察到大量孤立和联合的孔，其直径分布在 2 到 10μm 之间。与 PG 相比，合成的共聚物 PG-AM 在热稳定性和溶胀性能方面表现出优异的性能。详细的结构特征以及优异的热稳定性和溶胀性能将有利于有效利用合成共聚物作为制备具有各种潜在应用的大规模环保先进材料的前体。
