乙酸乙烯酯接枝改性海藻酸钙凝胶微球

化工进展

乙酸乙烯酯接枝改性海藻酸钙凝胶微球

漆亮亮，英晓光，李晓，张卫英，徐雯

福州大学化学化工学院，福建福州 350108

出版日期:2012-07-05 发布日期:2012-07-05

Preparation of polyvinyl acetate-grafted-calcium alginate beads

QI Liangliang，YING Xiaoguang，LI Xiao，ZHANG Weiying，XU Wen

School of Chemistry & Chemical Engineering，Fuzhou University，Fuzhou 350108，Fujian，China

Online:2012-07-05 Published:2012-07-05

摘要/Abstract

摘要： 为了降低海藻酸钙凝胶微球的溶胀度，以乙酸乙烯酯（VAc)对海藻酸钠进行自由基接枝共聚，进而制备具有较低溶胀度的聚乙酸乙烯酯改性海藻酸钙(Ca-SA-PVAc)凝胶微球。红外光谱表明，改性之后海藻酸钙的分子上生成新的化学键；热重分析表明，改性微球受热失水行为发生变化，热稳定性提高；扫描电镜表明，改性微球结构孔隙结构发达；接枝反应条件如反应温度、VAc的浓度、引发剂用量、海藻酸钠浓度、钙离子浓度及反应时间等对改性凝胶微球在生理盐水中的抗溶胀性具有不同程度的影响。通过改变反应条件以控制接枝反应参数，可以获得溶胀行为可控的改性海藻酸钙凝胶微球。

关键词: 海藻酸钠, 乙酸乙烯酯, 接枝反应, 溶胀度, 凝胶微球

Abstract: In order to reduce the swelling ratio of calcium alginate beads，vinyl acetate (VAc) was grafted on sodium alginate (SA) by free radical copolymerization，and vinyl acetate grafted calcium alginate (Ca-SA-PVAc) beads with low swelling ratio were prepared. FTIR indicated that new chemical bond was formed in modified alginate molecule. TGA showed that the rate of bound moisture loss of modified alginate beads was changed and its heat stability was improved. SEM showed that Ca-SA-PVAc beads had well-developed pore structure. The effects of reaction conditions，such as grafting reaction temperature，monomer and initiator concentrations，percentage of alginate and calcium chloride，grafting reaction time on swelling ratio in 0.9%NaCl solution were studied. By changing reaction conditions and consequently grafting reaction parameters，the swelling ratio of grafted beads could be controlled.

Key words: sodium alginate, vinyl acetate, grafting reaction, swelling ratio, hydrogel microsphere

漆亮亮，英晓光，李晓，张卫英，徐雯. 乙酸乙烯酯接枝改性海藻酸钙凝胶微球[J]. 化工进展.

QI Liangliang，YING Xiaoguang，LI Xiao，ZHANG Weiying，XU Wen. Preparation of polyvinyl acetate-grafted-calcium alginate beads[J]. Chemical Industry and Engineering Progree.

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