Study on high temperature degradation performance of poly （glycolic acid） and its regulation method

doi:10.19491/j.issn.1001-9278.2024.08.003

Abstract

Abstract:

This work evaluated the degradation property of poly （glycolic acid）（PGA） at different temperature as well as different pH environment. The change of crystallization and thermal stability properties during degradation was studied， and the degradation product of PGA was analyzed by liquid chromatograph⁃mass spectrometer. Thereafter， PGA was separately modified using anti⁃hydrolysis agent HyMax@210 and chain extender ADR⁃6488， and the effects of the two additives on melt fluidity， thermal stability， mechanical properties and degradation performance of PGA were studied. The results indicated that the degradation performance of PGA in high temperature aqueous solution was much better than that of traditional degradable materials. PGA degraded completely at 130 ℃ for 10 h in aqueous solution， and the degradation product was mainly glycolic acid trimers. Increasing pH value promoted the degradation of PGA. The thermal stability and mechanical properties of PGA was improved at the present of anti⁃hydrolysis and chain extender， and the degradation rate of that was delayed.

Key words: poly（glycolic acid）, degradation performance, degradation mechanism, anti?hydrolysis, chain extender

CLC Number:

TQ321

WANG Xingguo, LV Mingfu, HUANG Yilun, GUO Peng, GAO Dali, ZHANG Shijun. Study on high temperature degradation performance of poly （glycolic acid） and its regulation method[J]. China Plastics, 2024, 38(8): 13-19.

Figures/Tables 14

References 19

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样品名称	聚乙醇酸/%	扩链剂ADR6488/%	抗水解剂HyMax@210/%
PGA	100	0	0
PGA⁃P	100	0	0
PGA⁃C1	99.0	1.0	0
PGA⁃C2	98.0	2.0	0
PGA⁃A1	99.0	0	1.0
PGA⁃A2	98.0	0	2.0

样品名称	聚乙醇酸/%	扩链剂ADR6488/%	抗水解剂HyMax@210/%
PGA	100	0	0
PGA⁃P	100	0	0
PGA⁃C1	99.0	1.0	0
PGA⁃C2	98.0	2.0	0
PGA⁃A1	99.0	0	1.0
PGA⁃A2	98.0	0	2.0

样品名称	熔点/℃	熔融焓/J·g^-1	结晶温度/℃	结晶焓/J·g^-1	结晶度/%	T_{1 %}/℃	T_{5 %}/℃
PGA	222.9	90.2	196.0	81.1	47.2	317.3	345.3
PGA⁃1 d	215.3	105.8	190.5	86.3	55.3	258.9	299.3
PGA⁃3 d	214.4	102.3	186.0	83.0	53.5	181.0	232.3
PGA⁃5 d	213.8	86.7	183.6	81.8	45.3	156.2	216.8

样品名称	熔点/℃	熔融焓/J·g^-1	结晶温度/℃	结晶焓/J·g^-1	结晶度/%	T_{1 %}/℃	T_{5 %}/℃
PGA	222.9	90.2	196.0	81.1	47.2	317.3	345.3
PGA⁃1 d	215.3	105.8	190.5	86.3	55.3	258.9	299.3
PGA⁃3 d	214.4	102.3	186.0	83.0	53.5	181.0	232.3
PGA⁃5 d	213.8	86.7	183.6	81.8	45.3	156.2	216.8

样品名称	T_{1 %}/℃	T_{5 %}/℃	T_{50 %}/℃	T_max/℃	最大质量损失速率/%·℃^-1
PGA	317.3	345.3	395.9	406.6	2.26
PGA⁃P	299.3	335.6	393.6	400.6	1.87
PGA⁃C1	325.4	345.0	395.6	404.3	2.31
PGA⁃C2	332.8	354.8	405.9	413.3	2.44
PGA⁃A1	301.7	335.9	390.3	403.3	2.05
PGA⁃A2	313.8	347.5	400.8	410.0	2.34