文章摘要
原位固相聚合法制备聚乳酸-g-竹纤维
Preparation of Polylactic Acid-g-Bamboo Fiber by In-situ Solid Phase Polymerization
  
DOI:10.16865/j.cnki.1000-7555.2018.08.024
中文关键词: 竹纤维  聚乳酸  原位固相聚合  取代度  疏水性能
英文关键词: bamboo fiber  polylactic acid  in-situ solid phase polymerization  degree of substitution  hydrophobic property
基金项目:国家自然科学基金青年基金资助项目(31600460);中国博士后科学基金特别资助项目(2017T100615);中南林业科技大学大学生创新项目
作者单位
左迎峰, 何啸宇, 李 萍, 刘文杰, 李文豪, 郭 鑫, 吴义强 中南林业科技大学 材料科学与工程学院湖南 长沙 410004 
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中文摘要:
      以竹纤维为原料,乳酸为接枝单体,采用固相聚合法制备了聚乳酸接枝竹纤维(PLA-g-BF)。傅里叶变换红外光谱表征发现乳酸与竹纤维通过固相聚合法成功发生了接枝反应。研究了乳酸/竹纤维质量比、反应温度和反应时间对PLA-g-BF PLA取代基含量和取代度的影响,采用扫描电子显微镜(SEM)、接触角测试仪(CA)对PLA-g-BF进行了表征,并测试了120 h内的吸水率。结果表明,乳酸/竹纤维质量比为2∶1,反应温度为80 ℃,反应时间为7 h时,PLA-g-BF的PLA取代基含量和取代度达到最大值,分别为17.71%和38.74%。SEM测试显示竹纤维细胞壁上大量的纹孔被接枝物填充,且出现了明显的层状附着物。接触角和吸水率分析表明,通过固相聚合法将乳酸接枝到竹纤维上有效提高了竹纤维的疏水性能。
英文摘要:
      Polylactic acid grafted bamboo fiber (PLA-g-BF) was prepared by in situ solid phase polymerization, in which bamboo fiber was used as raw material and lactic acid as grafting monomer. The results of Fourier transform infrared spectroscopy show that the graft reaction between lactic acid and bamboo fiber was successful by in-situ solid phase polymerization. The effect of lactic acid/bamboo fiber mass ratio, reaction temperature and reaction time on the content of PLA substituent and degree of substitution of PLA-g-BF was studied. PLA-g-BF was characterized by scanning electron microscopy (SEM) and contact angle tester (CA), and the water absorption in 120 h was tested. The results show that the content of PLA substituent and the degree of substitution reach the maximum at 17.71% and 38.74% respectively when the mass ratio of PLA/bamboo fiber is 2∶1, the reaction temperature is 80 ℃ and the reaction time is 7 h. SEM tests show that a large number of pores on the cell walls of the bamboo fiber are filled with grafts, and obvious lamellar attachments appear. Contact angle and water absorption analysis show that the grafting of lactic acid onto bamboo fiber by in-situ solid phase polymerization effectively improves the hydrophobic properties of bamboo fiber.
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