改性纤维素基发泡材料的制备及其性能研究

Preparation and Properties of Modified Cellulose-Based Foaming Materials

先后对小麦秸秆进行Na OH预处理、乙酸酐改性,得到酰化改性小麦秸秆(AWS)。以酰化改性秸秆为原料,以水为发泡剂,以羧甲基纤维素(CMC)为交联剂,采用冷冻干燥法制备了具有一定强度的纤维素基发泡材料,研究了m(2%CMC)∶m(AWS)对发泡材料表观密度、微观形貌和力学强度的影响。结果表明,2%羧甲基纤维素的用量增大有利于表观密度的降低,m(2%CMC)∶m(AWS)为6时,发泡材料的力学性能较好,其载荷为3770 N,弹性模量为24.5 MPa。

In this paper,acylated wheat straw(AWS)was obtained by Na OH pretreatment and acetic anhydride modification.A cellulose based foaming material with certain strength was prepared by freeze drying method using acylated straw as raw material,water as foaming agent and carboxymethyl cellulose as crosslinking agent,the effects of m(2%CMC)∶m(AWS)on the apparent density,microstructure and mechanical strength of foamed materials were investigated.The results show that the increase of the dosage of 2%carboxymethyl cellulose is beneficial to the decrease of the apparent density.When m(2%CMC)∶m(AWS)is 6,the mechanical properties of the foamed material are good,the load is 3770 N,the elastic modulus is 24.5 MPa.