摘要
文中制备出不同组分比的PLLA-r-PCL无规共聚物薄膜,研究了其热学性能、力学性能和气体阻隔性能,探讨气体阻隔性能与共聚物结构之间的关系。通过红外光谱仪和差示扫描量热仪测试了材料的结晶性能。研究表明,随着PCL组分的增加,材料的结晶度呈降低趋势,薄膜材料几乎完全处于无定形态。采用拉力试验机对薄膜的力学性能进行测定,相较于纯PLLA,PLLA-r-PCL30的断裂伸长率达到了611%,为PLLA的70倍。同时,采用压差法透气仪对薄膜的透气性能进行了全面的分析,相较于纯PLLA,在40℃时,PLLA-r-PCL30的CO2和O2透过系数分别提高了801%和523%;在5℃时,PLLA-r-PCL30的CO2/O2的透过比(α(CO2/O2))达到7.0,提高了115%;此外,20℃时PLLA-r-PCL30的H2O蒸汽透过率提高了354%。
Poly(L-lactide)-r-poly(ε-caprolactone)(PLLA-r-PCL) random copolymer films with different composition ratios were prepared. The thermal property, mechanical property and gas barrier property were studied, meanwhile the relationship between gas barrier property and copolymer structure was discussed. The crystallization property of the materials was analyzed by ATR-FT-IR and differential scanning calorimeter(DSC). Studies show that the crystallinity of the material decreases with increasing of the PCL content which resulted in the films being almost completely amorphous. Compared to PLLA, the elongation at break of PLLA-r-PCL30 measured by tensile tester is 611%, which is 70 times of that of PLLA. Meanwhile, the gas permeability of the films was comprehensively analyzed by manometric gas permeability tester. Compared to PLLA, the CO2 permeability(CDP, 40 ℃) and O2 permeability(OP, 40 ℃) of PLLA-r-PCL30 are increased by 801% and 523% respectively, the α(CO2/O2, 5 ℃) of PLLA-r-PCL30 is 7.0 which is increased by 115% and the water vapor transmission rate(WVTR, 20 ℃) of it is increased by 354%.
作者
胡健
陆浩
张靳
卜红宇
云雪艳
董同力嘎
Jian Hu;Hao Lu;Jin Zhang;Hongyu Bu;Xueyan Yun;Tungalag Dong(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
2019年第11期74-81,87,共9页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(21564012)
关键词
聚乳酸
聚己内酯
无规共聚物
结晶性
气体阻隔性
气体选择透过性
poly(L-lactide)
poly(ε-caprolactone)
random copolymer
crystallinity
gas bar-rier property
gas permselectivity
