通过浓硫酸水解脱脂棉制备纤维素纳米晶体(CNC),并用3-氨基丙基三乙氧基硅烷(APTS)对其进行表面修饰。以4,4-二苯基甲烷二异氰酸酯(MDI)、聚四氢呋喃(PTMG)、CNC、1,4-丁二醇(BD)为原料制备聚氨酯弹性体/纤维素纳米晶体(PUE/CNC)复合材料,研究了CNC用量对PUE/CNC复合材料性能的影响。结果表明:当CNC用量达到1%(wt,质量分数,下同)时,复合材料的拉伸强度和断裂伸长率分别提高了178%和97.5%,热性能也有所提高;但CNC用量超过1.5%后,复合材料的力学性能下降,热性能仍保持提升。
Cellulose nanocrystals (CNC) were prepared by hydrolysis of absorbent cotton by concentrated sulfuric acid and surface modified with 3-aminopropyltriethoxysilane (APTS).Then use 4,4-diphenylmethane diisocyanate (MDI),poly(tetramethlene glycol)(PTMG),CNC,and 1,4-butanediol (BD) as raw materials,polyurethane elastomer/cellulose nanocrystal (PUE/CNC) composites were prepared.The influence of the amount of CNC on the properties of the composite was studied.The results shown that when the amount of CNC reached 1wt%,the tensile strength and elongation at break of the composites were increased by 178% and 97.5%,respectively,and the thermal properties are also improved.However,when the amount of CNC exceeded 1.5wt%,the mechanical properties of the composites decreased,and the thermal properties remained elevated.
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基金资助
国家自然科学基金(31570578,31270632);教育部中央高校基本科研业务费专项资金(JUSRP51622A)
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