Study on Microcellular Foaming Behavior of Chain⁃Extended Poly（butylene succinate）

doi:10.19491/j.issn.1001-9278.2021.08.018

Abstract

Abstract:

The chain?extended poly（butylene succinate）（CPBS） samples were prepared with different contents of chain extender through a melt blending method. As the content of chain extender increased， the crystallization temperature of PBS increased at first and then tended to decrease slightly. The crystallinity of PBS increased slightly， and its viscoelasticity was also improved. Supercritical CO₂ was used as a physical foaming agent to prepare PBS foams at a foaming temperature of 87 °C. The experimental results indicated that the cell size and volume expansion ratio of the forms decreased gradually with an increase in the content of chain extender， but and their cell density increased gradually. A microcellular CPBS foam was successfully prepared at a chain extender content of 8 wt %， leading to a cell size of 9.2 μm and a cell density of 1.93×10⁹ cells/cm³.

Key words: poly （butylene succinate）, chain extension, supercritical carbon dioxide, foaming, microcellular

CLC Number:

TQ 323.4⁺1

XUE Yu, YIN Dexian, XIANG Lubing, ZHOU Yuan, YANG Xueyue, ZHOU Hongfu. Study on Microcellular Foaming Behavior of Chain⁃Extended Poly（butylene succinate）[J]. China Plastics, 2021, 35(8): 125-130.

Figures/Tables 9

References 14

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样品编号	PBS/%	SAG/%
纯 PBS	100	0
PBS/SAG2	98	2
PBS/SAG4	96	4
PBS/SAG6	94	6
PBS/SAG8	92	8

样品编号	PBS/%	SAG/%
纯 PBS	100	0
PBS/SAG2	98	2
PBS/SAG4	96	4
PBS/SAG6	94	6
PBS/SAG8	92	8

样品	T_c/℃	ΔH_c/J?g^-1	T_m1 /℃	T_m2/℃	ΔH_m/ J?g^-1	χ_c/%
纯 PBS	87.8	61.6	105.6	114.1	54.7	30.8
PBS/SAG2	87.8	59.5	105.8	114.1	54.0	30.3
PBS/SAG4	88.2	59.6	105.9	113.8	55.2	31.0
PBS/SAG6	88.8	58.9	106.0	113.6	53.7	31.3
PBS/SAG8	88.3	58.6	105.8	113.6	53.0	31.8

样品	T_c/℃	ΔH_c/J?g^-1	T_m1 /℃	T_m2/℃	ΔH_m/ J?g^-1	χ_c/%
纯 PBS	87.8	61.6	105.6	114.1	54.7	30.8
PBS/SAG2	87.8	59.5	105.8	114.1	54.0	30.3
PBS/SAG4	88.2	59.6	105.9	113.8	55.2	31.0
PBS/SAG6	88.8	58.9	106.0	113.6	53.7	31.3
PBS/SAG8	88.3	58.6	105.8	113.6	53.0	31.8

样品名称	泡孔尺寸/μm	泡孔密度/个?cm^-3	发泡倍率
纯 PBS	-	?	4.4
PBS/SAG2	13.5	0.98×10⁹	3.9
PBS/SAG4	12.1	1.41×10⁹	3.7
PBS/SAG6	11.5	1.46×10⁹	3.2
PBS/SAG8	9.2	1.93×10⁹	3.0