甘油/1-丁基-3-甲基咪唑氯盐改性玉米淀粉/聚丁二酸丁二醇酯共混材料的结构与性能
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高分子材料工程国家重点实验室 四川大学高分子研究所,四川 成都610065

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高分子材料工程国家重点实验室自主课题(sklpme2022-2-13); 四川省应用基础研究项目(2017JY0247)


Structure and Properties of Glycerol/Ionic Liquid Modified Cornstarch/Polybutylene Succinate Blends
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    摘要:

    为提高淀粉/聚丁二酸丁二醇酯(PBS)共混材料的相容性和力学性能,以甘油和1-丁基-3-甲基咪唑氯盐([BMIM]C1)复配作为改性剂,通过熔融共混法制备了玉米淀粉/PBS共混材料,采用红外光谱、X射线衍射分析、扫描电镜、差示扫描量热法及力学性能测试等方法研究了复配改性剂对淀粉/PBS共混材料结构和性能的影响。结果表明,该复配增塑剂对玉米淀粉/PBS有良好的改性作用,改性效果与组成配比有关,随着改性剂中[BMIM]Cl含量的增加,改性淀粉/PBS的断裂伸长率逐渐增大,当[BMIM]Cl与甘油的质量比为9:1时,共混材料的断裂伸长率最高,表现出比甘油或[BMIM]Cl更强的改性作用。甘油/[BMIM]Cl主要通过改变羟基的氢键、增强淀粉-改性剂-PBS分子间的作用实现改性,能提高淀粉与PBS的相容性,降低共混材料的结晶度,可在共混材料拉伸强度变化不大的条件下,显著提高共混材料的断裂伸长率。以甘油/[BMIM]Cl(质量比9:1,加量为淀粉质量35%)为改性剂制备的淀粉/PBS共混材料(淀粉占淀粉与PBS的总质量的40%)的拉伸强度为17.53 MPa、断裂伸长率可达211.50%。

    Abstract:

    In order to improve the compatibility and mechanical properties of starch/polybutylene succinate (PBS) blends, using glycerol and 1-butyl-3-methylimidazolium chloride ([BMIM]C1) as modifier, the corn starch/PBS blend materials were prepared by melt blending method, and the effects of compound modification on the structure and properties of starch/PBS blends were studied by infrared spectroscopy, X-ray diffraction, scanning electron microscopy, differential scanning calorimetry and mechanical test. The results show that the compound plasticizer has well modification effect on corn starch/PBS blends, and the modification effect is related to the composition ratio, With the increase of [BMIM]Cl content in the modifier, the elongation at break of the modified starch/PBS gradually increases, when the mass ratio of [BMIM]Cl to glycerol is 9:1, the elongation at break of the blend is the highest, showing a stronger modification effect than glycerol or [BMIM]Cl. Glycerol/[BMIM]Cl modifies starch/PBS mainly by changing the hydrogen bonds of hydroxyl groups and enhancing the interaction between starch-modifier-PBS molecules, which can improve the compatibility of starch and PBS, and reduce the crystallinity of blended materials. Under the condition that the tensile strength of the blended material does not change much, the elongation at break of the blended material is significantly improved. Stretching of starch/PBS blends (starch accounts for 40% of the total mass of starch and PBS) prepared with glycerol/[BMIM]Cl (mass ratio 9:1, adding 35% starch mass) as modifier, the strength is 17.53 MPa and the elongation at break can reach 211.50%.

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  • 收稿日期:2022-03-20
  • 最后修改日期:2022-06-21
  • 录用日期:2022-06-28
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