Preparation of biodegradable PBAT foaming particles by supercritical carbon dioxide autoclave foaming technology

doi:10.19491/j.issn.1001-9278.2022.05.020

Abstract

Abstract:

Biodegradable poly（butylene adipate?co?butylene terephthalate）（PBAT） foaming particles were prepared using a supercritical carbon dioxide autoclave foaming technology. The chemical composition and thermal properties of the obtained PBAT were investigated using a nuclear magnetic resonance spectrometer， a gel permeation chromatographer， and a differential scanning calorimeter. Moreover， the effects of infiltration conditions on the foaming properties of PBAT were studied. The results indicated that the molar ratio of butylene adipate segment to butylene terephthalate segment in the PBAT chains was 53 and 47 mol%， respectively.The glass transition temperature， melting peak temperature， and crystallinity degree of PBAT were -33 ℃， 122 ℃， and 13.16 %， respectively. In addition， the obtained PBAT exhibited a decomposition temperature of 280 ℃. When the permeation temperature increased from 76 to 90 ℃， the density of PBAT foamed particles decreased but their expansion ratio increased. Their density tended to increase but their expansion ratio decreased after holding for one day. Their density and expansion ratio kept stable when the storage time was increased to seven days. When the permeation time increased from 0.5 to 2 h， the density of PBAT foamed particles decreased but their expansion ratio increased. With a further increase in permeation time from 2 to 3 h， their density and expansion ratio both kept stable. When the permeation pressure increased from 10 to 12 MPa， the density of PBAT foamed particles decreased but their expansion ratio increased. Their density and expansion ratio kept unchanged with a further increase in permeation pressure from 12 to 14 MPa.

Key words: poly（butylene adipate?co?terephthalate）, supercritical carbon dioxide, biodegradable copolyester, foamed particle

CLC Number:

TQ328

JI Feng, GONG Weihua, ZHANG Yan, LUO Shuiyuan, YU Qingyu, ZHU Junqiu, GUO Jiangbin. Preparation of biodegradable PBAT foaming particles by supercritical carbon dioxide autoclave foaming technology[J]. China Plastics, 2022, 36(5): 122-126.

Figures/Tables 8

Fig.1. Chemical structure and 1H?NMR spectra of PBAT

Fig.2. GPC curve of PBAT

Fig.3. DSC and TG curves of PBAT

Fig.4. Photos of foamed PBAT particles prepared at different infiltration temperatures

Fig.5. Effect of temperature on density and expansion ratio of PBAT foamed particles

渗透时间/h	密度/g·cm^-1	发泡倍率
0.5	0.299±0.031	4.29±0.03
1.0	0.209±0.012	6.14±0.01
2.0	0.165±0.003	7.77±0.01
2.5	0.169±0.014	7.61±0.01
3.0	0.171±0.002	7.50±0.02

Tab.1. Effect of osmotic time on density and expansion ratio of PBAT foamed particles

渗透压力/MPa	密度/g·cm^-1	发泡倍率
10	0.215±0.004	5.96±0.01
11	0.201±0.010	6.34±0.01
12	0.169±0.014	7.61±0.01
13	0.165±0.013	7.78±0.01
14	0.163±0.002	7.88±0.02

Tab.2. Effect of permeation pressure on density and expansion ratio of PBAT foamed particles

Fig.6. SEM images of PBAT foamed particles prepared at different infiltration temperatures

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