Preparation and characterizations of hydrolysis⁃resistant biodegradable PBAT

doi:10.19491/j.issn.1001-9278.2025.03.001

Abstract

Abstract:

PBAT/polycarbodiimide （PCDI） and PBAT/carbodiimide （CDI） blends were prepared through melt blending using CDI and PCDI as anti⁃hydrolysis agents， and the effect of the content of anti⁃hydrolysis agent on the thermal， mechanical， molecular weight， and hydrolysis behavior of PBAT was investigated. The results indicated that PCDI exhibited a remarkable efficacy on enhancing the hydrolysis resistance of PBAT， resulting in a significant reduction in the content of carboxyl end groups from 28.2 to 0.4 mol/t when 1.5 wt% PCDI was incorporated. The PBAT samples without any anti⁃hydrolysis agents showed a hydrolysis weight loss of 7.54 wt% after hydrolysis at 70 ºC for 1 051 h. The hydrolysis weight losses of the samples containing 0.5， 1.0， and 1.5 wt% PCDI was 6.71 %， 4.34 % and 0.55 %， respectively.

Key words: poly （butylene adipate?co?terephthalate）, polycarbodiimides, anti?hydrolysis agents, hydrolysis

CLC Number:

TQ321

XU Zixun, YUAN Jing, DU Xiyan, ZHANG Xinpeng, XU Jun, GUO Baohua. Preparation and characterizations of hydrolysis⁃resistant biodegradable PBAT[J]. China Plastics, 2025, 39(3): 1-6.

Figures/Tables 13

References 15

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样品	PBAT/g	CDI/PCDI含量/g
PBAT⁃0%CDI	50	0
PBAT⁃0.5%CDI	50	0.25
PBAT⁃1.0%CDI	50	0.50
PBAT⁃1.5%CDI	50	0.75
PBAT⁃0.5%PCDI	50	0.25
PBAT⁃1.0%PCDI	50	0.50
PBAT⁃1.5%PCDI	50	0.75

样品	PBAT/g	CDI/PCDI含量/g
PBAT⁃0%CDI	50	0
PBAT⁃0.5%CDI	50	0.25
PBAT⁃1.0%CDI	50	0.50
PBAT⁃1.5%CDI	50	0.75
PBAT⁃0.5%PCDI	50	0.25
PBAT⁃1.0%PCDI	50	0.50
PBAT⁃1.5%PCDI	50	0.75

样品	结晶温度/℃	结晶焓/J·g^-1	熔融温度/℃	熔融焓/ J·g^-1	结晶度/%
PBAT	71.2	17.6	121.4	12.2	10.8
PBAT⁃0.5%PCDI	69.4	19.6	120.3	13.0	11.4
PBAT⁃1.0%PCDI	67.9	16.4	119.7	10.2	8.94
PBAT⁃1.5%PCDI	64.5	19.4	119.1	13.4	11.8
PBAT⁃0.5%CDI	67.0	19.1	120.5	14.1	12.4
PBAT⁃1.0%CDI	68.5	18.7	120.5	12.8	11.2
PBAT⁃1.5%CDI	68.2	18.8	120.1	13.1	11.6

样品	结晶温度/℃	结晶焓/J·g^-1	熔融温度/℃	熔融焓/ J·g^-1	结晶度/%
PBAT	71.2	17.6	121.4	12.2	10.8
PBAT⁃0.5%PCDI	69.4	19.6	120.3	13.0	11.4
PBAT⁃1.0%PCDI	67.9	16.4	119.7	10.2	8.94
PBAT⁃1.5%PCDI	64.5	19.4	119.1	13.4	11.8
PBAT⁃0.5%CDI	67.0	19.1	120.5	14.1	12.4
PBAT⁃1.0%CDI	68.5	18.7	120.5	12.8	11.2
PBAT⁃1.5%CDI	68.2	18.8	120.1	13.1	11.6

样品	［η］/dL·g^-1	M_v/g·mol^-1	端羧基含量/mol·t^-1
PBAT	1.32	5.06×10⁴	28.2
PBAT⁃0.5%PCDI	1.39	5.43×10⁴	12.5
PBAT⁃1.0%PCDI	1.48	6.03×10⁴	7.5
PBAT⁃1.5%PCDI	1.59	6.73×10⁴	0.4
PBAT⁃0.5%CDI	1.33	5.08×10⁴	12.5
PBAT⁃1.0%CDI	1.33	5.09×10⁴	5.3
PBAT⁃1.5%CDI	1.28	4.83×10⁴	1.2