Improved barrier properties of biodegradable PBAT films for packaging applications using EVOH: Morphology, permeability, biodegradation, and mechanical properties

Elhamnia Mehdi; Motlagh Ghodratollah Hashemi; Jafari Seyed Hassan

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Improved barrier properties of biodegradable PBAT films for packaging applications using EVOH: Morphology, permeability, biodegradation, and mechanical properties

机译：Improved barrier properties of biodegradable PBAT films for packaging applications using EVOH: Morphology, permeability, biodegradation, and mechanical properties

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Oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) of poly(butylene adipate-co-terephthalate) (PBAT) were improved by poly(ethylene-co-vinyl alcohol) (EVOH). PBAT/EVOH blends at varying amounts of EVOH were prepared through melt mixing and characterized by OTR, WVTR, SEM, DSC, FTIR, biodegradation in soil, hydrolytic degradation, and tensile tests. EVOH considerably improved the barrier properties of PBAT, example, 77 reduction in OTR and 40 reduction in WVTR at 50 wt EVOH. Four models of Maxwell, Higuchi, Chiew Glandt, and Levy were used to evaluate morphology and mechanism of transmission. A high elongation at break of 730 was observed for PBAT/EVOH blends up to 20 wt EVOH but after that it severely dropped to 350 due to limited compatibility between the two polymers. Limited hydrogen bonding between PBAT and EVOH was observed by FTIR. EVOH accelerated the hydrolytic degradation of PBAT due to its high-water absorption capacity. This was not observed for biodegradation in soil suggesting that EVOH may retard microbial activity. After 540 h of hydrolytic degradation, the melting point and crystallization temperature of remaining PBAT increased by 5 and 10 DEG;C due to more degradation in adipate rubbery domains and less degradation in terephthalate hard segments.

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来源
《Journal of Applied Polymer Science》 |2023年第20期|共15页
作者
Elhamnia Mehdi; Motlagh Ghodratollah Hashemi; Jafari Seyed Hassan;
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作者单位

Univ Tehran;

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原文格式 PDF
正文语种英语
中图分类高分子化合物工业（高聚物工业）;
关键词
barrier properties; biodegradable polymer; biodegradation rate; blend; compatibility; EVOH; mechanical properties; OTR; PBAT; WVTR; BLENDS; MISCIBILITY; PERFORMANCE; ACID); WATER;

Improved barrier properties of biodegradable PBAT films for packaging applications using EVOH: Morphology, permeability, biodegradation, and mechanical properties

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