化工学报2024，Vol.75Issue(3)：1040-1051,12.DOI:10.11949/0438-1157.20231133
pH响应性气体渗透CNC/PBAT复合膜的制备与性能
Preparation and properties of pH-responsive gas permeable CNC/PBAT composite membranes
摘要
Abstract
Films with tunable gas permeation are important for the development of the packaging and preservation field,while designing films with pH-responsive permeation and high mechanical properties remains a challenge.In this paper,a two-step substitution reaction of succinic anhydride esterification and diethylenetriamine amidation was designed to achieve functionalized modification of amine group(A-CNC)and carboxyl group(S-CNC)on the surface of cellulose nanocrystals,which was further composited with poly(butylene adipate-co-terephthalate)(PBAT)to prepare composite films with pH-responsive gas permeation.The results showed that the cellulose nanocrystals and their functionalisation were characterised by scanning electron microscopy(SEM),infrared spectroscopy(FTIR)and nuclear magnetic resonance 13 C spectroscopy(13 C NMR),confirming the success of the modification.Characterisation of the composite film properties:in terms of mechanical properties,the tensile strength of S-CNC/PBAT(3/97)and A-CNC/PBAT(5/95)composite films reached the highest,which was 40.44%and 50.56%higher than PBAT respectively,whereas the elongation at break decreased and the fracture mode shifted from ductile to brittle fracture.In terms of gas permeability,the composite films showed mutual inverse pH response permeability characteristics.The permeability of S-CNC/PBAT(5/95)composite films showed a positive response to the trend of change,with the increase of buffer pH(3-12),CO2 and O2 permeability increased by 67.98%and 48.34%,respectively,and the water vapour permeability varied from 2.467×10-13 to 3.039×10-13 g·cm/(cm2·s·Pa),and A-CNC/PBAT(5/95)composite film permeation appeared pH negative responsive phenomenon,CO2 and O2 permeability decreased by 63.00%and 54.61%,respectively,and the water vapour permeability changed from 2.747×10-13 to 2.043×10-13 g·cm/(cm2·s·Pa).This composite film with pH-responsive permeability has a broad prospect in the field of smart packaging.关键词
纤维素纳米晶/功能化修饰/复合材料/力学性能/响应性渗透Key words
cellulose nanocrystals/functionalized modification/composite material/mechanical properties/responsive permeation分类
轻工纺织引用本文复制引用
丁相斐,丘晓琳,朱喜成,张佳伟,陈锦华..pH响应性气体渗透CNC/PBAT复合膜的制备与性能[J].化工学报,2024,75(3):1040-1051,12.基金项目
江苏省农业科技自主创新基金项目(CX(22)1014) （CX(22）
