文章摘要
三羟甲基氨基甲烷改性聚乙烯醇的制备与性能
Preparation and Properties of Poly(vinyl alcohol) modified with Tri-hydroxymethyl Aminomethane
  
DOI:10.16865/j.cnki.1000-7555.2018.07.024
中文关键词: 聚乙烯醇  氢键  热塑加工
英文关键词: poly(vinyl alcohol)  hydrogen bond  thermal processability
基金项目:国家自然科学基金资助项目(51433006,51473094);广东省科学院实施创新驱动发展能力建设专项资金(2017GDASCX-0828)
作者单位
李发勇1,2,夏和生1 1.四川大学高分子研究所 高分子材料工程国家重点实验室,四川 成都 610065
2.广东省生物工程研究所(广州甘蔗糖业研究所),广东 广州 510316 
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中文摘要:
      利用聚乙烯醇(PVA)羟基的反应活性,与丁二酸酐反应对PVA 羟基部分羧酸化,然后与三羟甲基氨基甲烷(TRIS)进行酰胺反应制备了可热塑加工且具有弹性的TRIS改性聚乙烯醇(PVA-COO-TRIS)。采用红外光谱、X射线衍射、差示扫描量热分析、热重分析、动态力学热分析和力学性能测试等研究了TRIS的引入对PVA 的结构和性能的影响。结果表明,在PVA分子链上引入TRIS的多羟基结构与PVA 羟基形成新的氢键作用,可减少对改性PVA 氢键作用的破坏,同时TRIS的引入破坏了PVA分子链的规则性,致使其结晶度和熔点显著下降,并可抑制相邻羟基间的脱除,使其热稳定性提高。引入量为2.25%(摩尔分数)时可获得较宽的熔融加工窗口(~108℃),在不添加任何增塑剂的条件下实现了PVA的热塑加工,其拉伸强度为30MPa,断裂伸长率为300%。
英文摘要:
      Tri-hydroxymethyl aminomethane (TRIS) functionalized poly(vinyl alcohol) (PVA-COO-TRIS) elastomer with thermal processability was synthesized by two steps: (i) carboxylation of PVA with succinic anhydride; (ii) conjugation of TRIS via carbodiimide chemistry. The prepared PVA modified with TRIS (PVA-COO-TRIS) were characterized by FT-IR, XRD, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and tensile testing, respectively. It is found that the introduction of TRIS in PVA has significant effects on the crystalline, thermal and mechanical properties of PVA films. The crystallization of PVA is interrupted and the crystallinity of PVA films decreases with the modification of TRIS dramatically. The glass transition temperature (Tg) and melt point of PVA modified with TRIS decrease, and the thermal stability is improved due to its inhibitory effect on removal of the adjacent hydroxyl groups in the PVA molecules chain. When the substitution degree of TRIS moiety is 2.25%(molar faction), the difference between Tm and Td of modified PVA is up to ~108℃, thus the modified PVA could be thermally processed without any plasticizer, and its tensile strength is 30 MPa, while the elongation at break is 300%.
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