北京林业大学学报2019，Vol.41Issue(2)：125-133,9.DOI:10.13332/j.1000--1522.20180281
木质素基聚电解质薄膜的制备及其力学性能
Preparation of lignin-based polyelectrolyte film and its mechanical properties
摘要
Abstract
[Objective] The industrial waste lignin was modified to prepare trimethyl-lignin quaternary amine salt (TLQA) . The polyelectrolyte film was prepared by compounding TLQA with carboxymethylated polyvinyl alcohol (CMPVA) which was the modified product from polyvinyl alcohol.The influence of different factors on the mechanical properties of polyelectrolyte films was analyzed, and the structure and thermal stability of the films were characterized. The results will provide theoreticalbasis for the application of lignin-based polyelectrolytes in sustained release, plastic film and packaging.[Method] First, quaternization of lignin and carboxymethylation of polyvinyl alcohol were carried out respectively to prepare cationic and anionic polyelectrolytes. With formaldehyde cross-linking agent and polyvinyl alcohol film-forming agent, TLQA/CMPVA reaction film was prepared by a casting method.The structure, morphology and thermal properties of polyelectrolyte films were characterized by FTIR, SEM and TG. [Result] The molality of R4 N+of TLQA was 1. 81 mmol/g, and that of —COO-of CMPVA was 0. 62 mmol/g. The optimum conditions to prepare film of best mechanical properties were as follows: the total solid content of polyelectrolyte crosslinked film was 10％, polyvinyl alcohol accounted for 30％ of the solid content, TLQA and CMPVA accounted for 70％ of the solid content (mass ratio of TLQA to CMPVA was 3 : 7) , and formaldehyde mass fraction was 3. 88％, p H 9. Elongation-at-break (EB) and tensile strength (TS) of TLQA/CMPVA reaction film were 222. 13％ and 6. 80 MPa, respectively. The surface of reaction film was smooth and the section was uneven, while the surface of blend film was rough. The ether bond was formed in TLQA/CMPVA reaction film. The thermal stability of TLQA/CMPVA reaction film increased after formaldehyde crosslinking. [Conclusion]With polyvinyl alcohol film-forming agent and formaldehyde cross-linking agent, TLQA/CMPVA reaction film with good slow-release performance and improved thermal stability can be obtained by the modification of lignin and polyvinyl alcohol.关键词
木质素/聚乙烯醇/聚电解质/薄膜/力学性能Key words
lignin/polyvinyl alcohol/polyelectrolyte/film/mechanical properties分类
轻工纺织引用本文复制引用
苏玲,庞久寅,任世学,李淑君,姜贵全..木质素基聚电解质薄膜的制备及其力学性能[J].北京林业大学学报,2019,41(2):125-133,9.基金项目
国家自然科学基金项目(31800480) （31800480）
吉林省教育厅项目(JJKH20170045KJ) （JJKH20170045KJ）
吉林省林业厅(JLT[2017]14号) （JLT[2017]14号）
吉林省科技厅项目(20170203001SF) （20170203001SF）
北华大学博士启动基金项目(202117085) （202117085）
