摘要
为改善聚(L-乳酸)(PLLA)薄膜的果蔬平衡气调包装性能,文中首先通过熔融酯化缩聚法将聚衣康酸丁二醇酯(PBI)作为柔性链段引入PLLA中制备PLBI共聚物,进一步通过溶液浇筑法将中空介孔SiO_(2)微球(HMSM)作为气体渗透“通道”填充到PLBI中制备PLBI/HMSM复合膜。探究了软段嵌入、HMSM粒径对复合膜包装性能的影响,并评估了薄膜对草莓包装内气氛的调控作用。结果表明,与PLLA相比,PLBI薄膜的Tg降低了5.4℃,断裂伸长率增加了14.3倍。继续添加质量分数0.9%700 nm的HMSM后,PLBI薄膜的CO_(2)透过率(CDTR)和O_(2)透过率(OTR)分别约为PLLA的2.2倍和3.3倍,而水蒸气透过率有所下降。草莓保鲜结果表明,在3~25 d的贮藏期间,PLBI/HMSM薄膜内的CO_(2)和O_(2)含量分别维持在6.9%~8.0%和3.1%~4.6%,可为草莓提供理想的保鲜微气氛,有效延缓了草莓的枯干和腐烂。
The performance of polylactic acid(PLLA)membrane for the equilibrium-modified atmosphere packaging of fruit and vegetable still needs to be further improved due to the defects of PLLA itself.In this work,PLBI copolymer was prepared by introducing polybutylene itaconate(PBI)into PLLA as flexible chain segment through melting esterification and polycondensation reaction.PLBI/HMSM membranes were prepared by filling hollow mesoporous SiO_(2)microspheres(HMSM)into PLBI by solution casting method.The effects of soft segment embedding and HMSM particle size on the packaging performance of the membranes were explored,and the regulatory effect of the membranes on the micro atmosphere in strawberry packaging was evaluated.The results show that T_(g) of PLBI membranes is decreased by 5.4℃and the elongation at break is increased by 14.3 fold compared to PLLA.After adding 0.9%of 700 nm HMSM,the carbon dioxide transmission rate(CDTR)and oxygen transmission rate(OTR)of PLBI films are increased significantly,and CDTR and OTR are about 2.2 and 3.3 times of PLLA,respectively,while the water vapor transmission rate(WVTR)decreases.Preservation results suggest that the PLBI/HMSM packaging membrane could generate an ideal high 6.9%~8.0%CO_(2)and low 3.1%~4.6%O_(2)atmosphere for strawberry preservation,delaying the drying and rotting of okra.
作者
张家涛
赵文波
胡健
孙滔
董同力嘎
云雪艳
Jiatao Zhang;Wenbo Zhao;Jian Hu;Tao Sun;Tungalag Dong;Xueyan Yun(College of Food Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2023年第8期91-103,共13页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(21564012,21805142)。
关键词
聚乳酸
衣康酸丁二醇酯
中空介孔SiO_(2)微球
断裂伸长率
透气性
平衡气调包装
poly(L-lactic acid)
polybutylene itaconate
hollow mesoporous SiO_(2)microsphere
elongation at break
gas permeability
equilibrium-modified atmosphere packaging
