微相分离结构对聚乳酸薄膜性能的调控及其在巨峰葡萄保鲜中的应用

doi:10.11896/cldb.21080286

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Abstract To improve the performance of poly(L-lactic acid) (PLLA) and to increase its potential application in the field of fruit and vegetable preservation, in this study, polytrifluoropropyl methylsiloxane (PTFPMS) and polyethylene glycol (PEG) were used to conduct ring-opening reaction with L-lactide. PLLA-PTFPMS-PLLA (PLTL) and PLLA-PEG-PLLA (PLEL) triblock copolymers were successfully prepared. PLTL/PLEL blend films were obtained by blending PLEL with PLEL at 75∶25, 50∶50 and 25∶75. The experimental results show that PTFPMS and PEG blocks improve the flexibility and thermal properties of PLLA, T_g of PLLA was changed to 57.8 ℃ and 43.9 ℃, and the elongation at break of PLLA films reaches 108.7% and 199.7%, respectively. The T_g of PLLA was changed from 52.3 ℃ to 46.2 ℃. At 5 ℃, the CO₂ transmittance of PLTL and PLEL films is 2.12 times and 3.51 times of PLLA, and the O₂ transmittance is 1.97 times and 0.87 times of PLLA, respectively. Moreover, the CO₂/O₂ transmittance ratio of PLTL and PLEL films is 3.3 and 12.2, at 20 ℃, the H₂O transmission rate was 0.87 times and 3.29 times that of PLLA. It shows that PEG can greatly improve CO₂ transmittance, but has little contribution to O₂ transmittance. PTFPMS can improve both CO₂ and O₂ transmittance. After blending, the CO₂, O₂ and H₂O transmission amounts are 2.55—3.33 times, 1.15—1.46 times and 0.92—2.66 times of PLLA, and the CO₂/O₂ transmission ratio reaches 5.3—8.8. The results indicate that PLTL/PLEL blend film has a CO₂/O₂ transmittance ratio suitable for fresh fruit and vegetable packaging while maintaining excellent gas transmittance. The modified material and commercially available PE cling film were applied to preserve the grapes. The PLTL-PLEL50 group reached the optimum 5%O₂+8%CO₂ concentration for grapes on the 10th day of storage, extending the shelf life of grapes to 30 days.

Key words： poly(L-lactic acid) flexibility freshness preservation gas permeability H₂O permeability

Published: 10 May 2023 Online: 2023-05-04

CLC number:

TQ316

Fund:National Natural Science Foundation of China (21805142).

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	Articles by authors
	WANG Yangyang
	YUN Xueyan
	ZHOU Ziyi
	YUAN Shuai
	SUN Tao
	ALATA Hexig
	DONG Tungalag

Cite this article:

WANG Yangyang,YUN Xueyan,ZHOU Ziyi, et al. Modulation of Poly(L-lactic acid) Films Properties by Microphase Separation Structure and Its Application in Preservation of Kyoho Grapes[J]. Materials Reports, 2023, 37(9): 21080286-10.

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http://www.mater-rep.com/EN/10.11896/cldb.21080286 OR http://www.mater-rep.com/EN/Y2023/V37/I9/21080286

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