聚氨酯弹性体/纤维素纳米晶体复合材料的制备及性能研究

Preparation and property of polyurethane elastomer/CNC composite

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.