Degradation behaviors of PBAT biodegradable mulch in soil

doi:10.19491/j.issn.1001-9278.2022.01.010

Abstract

Abstract:

This paper focused on the degradation behaviors of poly （butylene?adipate?co?terephthalate）（PBAT） mulch under the soil?buried condition. Fourier transform infrared spectroscopy （FTIR）， X?ray photoelectron spectroscopy， thermogravimetric analysis， scanning electron microscopy， and gel permeation chromatography were conducted to analyze the changes of chemical structure， surface element analysis， thermal stability， surface micro?morphology， and molecular weight of PBAT films during the degradation process. After bury for four months， the FTIR spectra of PBAT showed attenuation in the intensity of C—O absorption peaks due to the broken ester bond in their molecular chains. The atomic ratio of O to C increased from 0.27 to 0.77， whereas the bonding energy of these elements decreased. The thermal stability of PBAT decreases due to the changes of aggregation state. The results indicated that the degradation of PBAT occurred at the molecular level during the burying experiment， resulting in a complete degradation of the whole biodegradable membrane in the soil.

Key words: poly （butylene?adipate?co?terephthalate）, mulch film, degradation, soil

CLC Number:

TQ323.4

GUAN Tonghui, FU Ye, WENG Yunxuan. Degradation behaviors of PBAT biodegradable mulch in soil[J]. China Plastics, 2022, 36(1): 67-72.

Figures/Tables 9

Fig. 1. Chemical structure of PBAT

样品编号	PBAT含量/%	PE含量/%	CaCO₃含量/%	炭黑含量/%
1^#	80	—	20	—
2^#	—	80	-	20
3^#	60	—	40	—
4^#	90	—	—	10
5^#	—	90	10	—
6^#	80	—	—	20
7^#	—	80	20	—
8^#	70	—	30	—
9^#	—	90	—	10

Tab.1. Formula of different mulch films

Fig.2. FTIR of plastic film samples with different buried time

Fig.3. XPS spectra of broad spectrum， C 1s， O 1s of mulch film sample 1# before and after 60 days of soil burial

样品	0 d	60 d
1^#	403	324
3^#	246	218
4^#	270	238
6^#	336	246

Tab.2. Mn of 1#~9# mulch film samples before and after 60 days of burying in soil

Fig.4. TG curves of samples 1~9 before and after 60 days of burial

样品	60 d前			60 d后
样品	T_{d，10 %}/ ℃	T_{d，50 %}/ ℃	残炭率/ %	T_{d，10 %}/ ℃	T_{d，50 %}/ ℃	残炭率/ %
1^#	369	413	21	367	411	4
3^#	346	—	61	338	420	34
4^#	355	408	3	347	404	2
6^#	379	433	42	349	410	5
8^#	357	420	40	324	406	23

Tab.3. Thermal degradation parameter of PBAT film before and after degradation of 60 days

Fig.5. Appearance photos of 1#~9# mulch film samples before and after 60 days of burying in soil

Fig.6. SEM of 1#~9# mulch film samples before and after 60 days of soil burial

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