Properties and applications of poly（butylene adipate⁃co⁃terephthalate）⁃based self⁃regulating gas film

doi:10.19491/j.issn.1001-9278.2024.06.005

Abstract

Abstract:

A type of blending films based on poly（butylene adipate⁃co⁃terephthalate）（PBAT） and poly（lactic⁃co⁃butanediol itaconate）（PLBI） were prepared at different mass ratios through melt extrusion using a twin⁃screw extruder. The effect of PLBI content on the thermal performance， mechanical properties， and gas permeability of the blending films was investigated. The modified atmosphere packaging （MAP） system was designed on the basis of the gas permeability of material and the respiratory characteristics of strawberry. This MAP system was used for a strawberry⁃preserving experiment. The results indicated that the blended films achieved favorable mechanical properties at a PLBI content of 15 wt%. Through adjusting the blending ratio， the CO₂/O₂ penetration ratio of the blending films was reduced from 10.57 to about 3~7. Simultaneously， the water retention capacity of the blending films was enhanced. This makes the blending films more suitable for air⁃adjusted fruit and vegetable packaging. This packaging system can be used to extend the shelf life of strawberries up to 21 days under low⁃temperature storage conditions.

Key words: poly（butylene adipate terephthalate）, poly （lactic?butanediol itaconate）, modified atmosphere storage, mechanical property, shelf life

CLC Number:

TQ320.72⁺1

ZHOU Ziyi, WANG Yangyang, SUN Tao, JIANG Wei, DONG Tungalag, YUN Xunyan. Properties and applications of poly（butylene adipate⁃co⁃terephthalate）⁃based self⁃regulating gas film[J]. China Plastics, 2024, 38(6): 31-38.

Figures/Tables 13

References 18

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评价项目	评价标准
评价项目	9. 1~10	7.1~9	5.1~7	3.1~5	1~3
色泽	明亮鲜红	亮度降低	颜色加深	颜色暗淡	颜色深红
新鲜度	可销售	无褐变轻微脱水	轻微褐变轻微脱水	出现褐斑脱水严重	褐变加重严重萎蔫
质地	硬挺富有弹性	硬度下降弹性减弱	稍微发软弹性减弱	变软弹性变差	很软无弹性
气味	果香浓郁无异味	有香味无异味	香味较淡基本无异味	香味减淡略带异味	香味消失有异味

评价项目	评价标准
评价项目	9. 1~10	7.1~9	5.1~7	3.1~5	1~3
色泽	明亮鲜红	亮度降低	颜色加深	颜色暗淡	颜色深红
新鲜度	可销售	无褐变轻微脱水	轻微褐变轻微脱水	出现褐斑脱水严重	褐变加重严重萎蔫
质地	硬挺富有弹性	硬度下降弹性减弱	稍微发软弹性减弱	变软弹性变差	很软无弹性
气味	果香浓郁无异味	有香味无异味	香味较淡基本无异味	香味减淡略带异味	香味消失有异味

样品	PBAT	PLBI	PLLA		T_m1^（a）/℃	H_m1^（a）/ J·g^-1
样品	T_g^（b）/℃	T_g^（b）/℃	T_c^（c）/℃	H_c^（c）/ J·g^-1	T_m1^（a）/℃	H_m1^（a）/ J·g^-1
PBAT	-29.23	-	-	-	122.83	16.34
5 %PLBI	-31.28	53.23	72.89	1.00	122.66	17.34
10 %PLBI	-31.75	53.60	76.40	3.02	124.26	14.56
15 %PLBI	-24.21	49.49	72.46	4.14	123.53	18.23

样品	PBAT	PLBI	PLLA		T_m1^（a）/℃	H_m1^（a）/ J·g^-1
样品	T_g^（b）/℃	T_g^（b）/℃	T_c^（c）/℃	H_c^（c）/ J·g^-1	T_m1^（a）/℃	H_m1^（a）/ J·g^-1
PBAT	-29.23	-	-	-	122.83	16.34
5 %PLBI	-31.28	53.23	72.89	1.00	122.66	17.34
10 %PLBI	-31.75	53.60	76.40	3.02	124.26	14.56
15 %PLBI	-24.21	49.49	72.46	4.14	123.53	18.23

样品	厚度/μm	断裂伸长率/%	拉伸强度/MPa	弹性模量/MPa
PBAT	42.0	360.1±25.6^c	23.3±2.4^a	74.23±0.8^b
PBAT/PLBI 5%	43.2	720.3±44.4^a	17.2±1.8^b	62.87±5.7^d
PBAT/PLBI 10%	44.2	548.3±37.9^b	15.7±1.2^c	70.80±4.4^c
PBAT/PLBI 15%	43.8	125.8±18.2^d	11.3±1.4^d	93.94±4.9^a