Plasticizing effect of low molecular weight polyesters synthesized from epoxidized soybean oil for poly（vinyl chloride）

doi:10.19491/j.issn.1001-9278.2023.11.010

Abstract

Abstract:

The epoxide functional groups of epoxidized soybean oil （ESO） were cross⁃linked with succinic acid （SA） through a ring opening reaction， and three types of epoxidized soybean oil⁃succinic acid copolymers （ESO⁃SA₅， ESO⁃SA₉ and ESO⁃SA₁₃） with different molecular weights were obtained through regulating the reaction time， and their chemical structures were characterized. The thermal and mechanical properties of poly（vinyl chloride）（PVC） modified by using ESO⁃SA _n as a plasticizer were studied， and the effects of the molecular weight and addition amount of ESO⁃SA _n on the plasticizing effect were investigated. In addition， the effect of molding method （solvent casting film and melt pressing film） on the properties of plasticized PVC film was compared. Finally， the effect of thermal stabilizer on the properties of melt⁃pressing film was investigated. The results indicated that among the plasticized films prepared by different molding methods， the plasticized film containing 30 phr ESO⁃SA₉ exhibited the best performance， including plasticizing effect， mechanical properties （elongation at break of 269.6 % and tensile strength of 28.7 MPa）， and thermal properties （initial thermal degradation temperature of 284.3 °C）. A better mixing effect between the PVC and plasticizer at a molecular level could be achieved. Owing to the poor compatibility between calcium⁃zinc stabilizer and matrix as well as the destruction of the plasticizing network structure formed by ESO⁃SA_n in PVC， the addition of thermal stabilizer resulted in a decrease to some extent in the mechanical and thermal properties of the plasticized films.

Key words: poly（vinyl chloride）, epoxidized soybean oil, bio?based plasticizer, low molecular weight polyester

CLC Number:

TQ314.24

YANG Yang, HAN Yu, WENG Yunxuan, SONG Xinyu, HUANG Zhigang, ZHANG Caili. Plasticizing effect of low molecular weight polyesters synthesized from epoxidized soybean oil for poly（vinyl chloride）[J]. China Plastics, 2023, 37(11): 87-94.

Figures/Tables 13

References 31

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成型方式	样品	PVC	ESO⁃SA₅	ESO⁃SA₉	ESO⁃SA₁₃	ESO	DOP	Ca⁃Zn 稳定剂
溶剂流延膜	PVC	100	—	—	—	—	—	—
	PVC/10ESO⁃SA₅	100	10	—	—	—	—	—
	PVC/20ESO⁃SA₅	100	20	—	—	—	—	—
	PVC/30ESO⁃SA₅	100	30	—	—	—	—	—
	PVC/10ESO⁃SA₉	100	—	10	—	—	—	—
	PVC/20ESO⁃SA₉	100	—	20	—	—	—	—
	PVC/30ESO⁃SA₉	100	—	30	—	—	—	—
	PVC/10ESO⁃SA₁₃	100	—	—	10	—	—	—
	PVC/20ESO⁃SA₁₃	100	—	—	20	—	—	—
	PVC/30ESO⁃SA₁₃	100	—	—	30	—	—	—
熔融压制膜	PVC/10DOP	100	—	—	—	—	10	—
	PVC/20DOP	100	—	—	—	—	20	—
	PVC/30DOP	100	—	—	—	—	30	—
	PVC/20ESO⁃SA₉	100	—	20	—	—	—	—
	PVC/30ESO⁃SA₉	100	—	30	—	—	—	—
	PVC/20ESO⁃SA₁₃	100	—	—	20	—	—	—
	PVC/30ESO⁃SA₁₃	100	—	—	30	—	—	—
	PVC/20ESO	100	—	—	—	20	—	—
	PVC/30ESO	100	—	—	—	30	—	—
	PVC/20ESO⁃SA₉⁃s	100	—	20	—	—	—	4
	PVC/30ESO⁃SA₉⁃s	100	—	30	—	—	—	4
	PVC/20ESO⁃SA₁₃⁃s	100	—	—	20	—	—	4
	PVC/30ESO⁃SA₁₃⁃s	100	—	—	30	—	—	4

成型方式	样品	PVC	ESO⁃SA₅	ESO⁃SA₉	ESO⁃SA₁₃	ESO	DOP	Ca⁃Zn 稳定剂
溶剂流延膜	PVC	100	—	—	—	—	—	—
	PVC/10ESO⁃SA₅	100	10	—	—	—	—	—
	PVC/20ESO⁃SA₅	100	20	—	—	—	—	—
	PVC/30ESO⁃SA₅	100	30	—	—	—	—	—
	PVC/10ESO⁃SA₉	100	—	10	—	—	—	—
	PVC/20ESO⁃SA₉	100	—	20	—	—	—	—
	PVC/30ESO⁃SA₉	100	—	30	—	—	—	—
	PVC/10ESO⁃SA₁₃	100	—	—	10	—	—	—
	PVC/20ESO⁃SA₁₃	100	—	—	20	—	—	—
	PVC/30ESO⁃SA₁₃	100	—	—	30	—	—	—
熔融压制膜	PVC/10DOP	100	—	—	—	—	10	—
	PVC/20DOP	100	—	—	—	—	20	—
	PVC/30DOP	100	—	—	—	—	30	—
	PVC/20ESO⁃SA₉	100	—	20	—	—	—	—
	PVC/30ESO⁃SA₉	100	—	30	—	—	—	—
	PVC/20ESO⁃SA₁₃	100	—	—	20	—	—	—
	PVC/30ESO⁃SA₁₃	100	—	—	30	—	—	—
	PVC/20ESO	100	—	—	—	20	—	—
	PVC/30ESO	100	—	—	—	30	—	—
	PVC/20ESO⁃SA₉⁃s	100	—	20	—	—	—	4
	PVC/30ESO⁃SA₉⁃s	100	—	30	—	—	—	4
	PVC/20ESO⁃SA₁₃⁃s	100	—	—	20	—	—	4
	PVC/30ESO⁃SA₁₃⁃s	100	—	—	30	—	—	4

样品	数均分子量/g·mol^-1	重均分子量/g·mol^-1
SA	202	—
ESO	951	—
ESO⁃SA₅	1 492	1 853
ESO⁃SA₉	1 693	2 009
ESO⁃SA₁₃	1 923	2 162

样品	数均分子量/g·mol^-1	重均分子量/g·mol^-1
SA	202	—
ESO	951	—
ESO⁃SA₅	1 492	1 853
ESO⁃SA₉	1 693	2 009
ESO⁃SA₁₃	1 923	2 162

成型方式	样品	断裂伸长率/%			拉伸强度/MPa
成型方式	样品	10份增塑剂	20份增塑剂	30份增塑剂	10份增塑剂	20份增塑剂	30份增塑剂
溶剂流延膜	PVC/DOP	123.4±27.7	144.0±12.4	195.6±27.5	16.9±0.8	13.8±1.3	16.2±2.4
	PVC/ESO⁃SA₅	0.3±0.1	41. 6±16.1	33.3±2.7	21.9±2.4	24.3±0.7	9.4±0.6
	PVC/ESO⁃SA₉	109.7±17.5	189.0±10.0	255.1±10.7	18.8±1.1	16.5±2.8	16.7±4.3
	PVC/ESO⁃SA₁₃	2.6±0.3	232.2±3.1	220.9±4.1	19.7±0.1	18.9±3.0	7.5±0.3
熔融压制膜	PVC/ESO⁃SA₉	—	162.9±16.2	269.6±25.7	—	34.1±2.6	28.7±3.5
	PVC/ESO⁃SA₁₃	—	140.8±21.9	202.9±20.0	—	33.4±4.8	24.4±1.6
	PVC/ESO⁃SA₉⁃s	—	12.3±3.0	197.4±32.5	—	31.2±2.1	21.9±2.2
	PVC/ESO⁃SA₁₃⁃s	—	66.3±8.4	207.9±26.5	—	36.0±1.4	23.9±0.6
	PVC/ESO	—	199.2±47.0	203.2±13.9	—	36.8±2.1	23.4±3.0