基于纤维素-糠醛-油脂的热塑性材料的合成和性能表征

摘要

Biomass-based thermoplastic elastomer materials derived from cellulose, furfural and grease were prepared by "graft from" ATRP using ethyl cellulose(EC), tetrahydrofurfuryl methacrylate(THFMA) and lauryl methacrylate(LMA). FT-IR, 1 H NMR and GPC were applied to characterize the structure of graft copolymers, and proved the successful preparation of graft copolymer. The DSC analysis showed that the Tg of EC graft copolymers were between 13 ℃ and 27 ℃. The mechanical properties test showed that the tensile strength increased from 5. 1 MPa to 13. 7 MPa with the increasing of THFMA content in the feed. Compared to the linear copolymer which has the same THFMA/LMA composition, the EC graft copolymer possessed 3. 7 times higher tensile strength. It is worth noting that the EC content in the feeding is between 0. 91% -1. 42%, which indicated that a small amount of EC could greatly improve the mechanical properties of graft copolymer.%以乙基纤维素(EC)、甲基丙烯酸四氢糠基酯(THFMA)和甲基丙烯酸月桂酯(LMA)为原料,通过"从主链接枝"的原子转移自由基聚合(ATRP)法制备了基于纤维素-糠醛-油脂的全生物质基热塑性弹性体材料EC-g-P(LNA-co-THFMA),采用FT-IR、1 H NMR、GPC、DSC和应力-应变测试对制备的接枝共聚物进行结构表征和性能分析,并初步探讨了THFMA/LMA投料比对接枝共聚物性能的影响.DSC测试表明:当n(THFMA):n(LMA)为200:100～400:100时,乙基纤维素接枝共聚物的玻璃化转变温度(Tg)在13～27℃;机械性能研究发现,随着投料中THFMA比例的增加,拉伸强度由5.1 MPa逐渐增加到13.7 MPa;通过与具有相同THFMA/LMA组成的线性共聚物P(LMA-co-THFMA)相比,EC的引入使得拉伸强度提高了3.7倍;在制备的EC基接枝共聚物投料中EC质量分数为0.91％ ～1.42％,这表明少量EC的引入便可极大地改善接枝共聚物的机械性能.