Effect of dibenzoyl hydrazide sebacic acid on crystallization properties of poly（ethylene succinate⁃co⁃ethylene oxalate）

doi:10.19491/j.issn.1001-9278.2025.10.001

Abstract

Abstract:

Poly（ethylene succinate⁃co⁃ethylene oxalate）（PESOx） is an environmentally friendly， biodegradable polyester whose practical application is hindered by its slow crystallization kinetics following copolymerization. To address this drawback， we incorporated the organic nucleating agent dibenzoyl hydrazide sebacic acid （TMC⁃300） into PESOx via solution blending. While TMC⁃300 did not alter the crystal structure or thermal stability of the polymer， it remarkably enhanced its crystallization properties. The nucleating agent significantly increased the crystallization temperature and enthalpy， shortened the half⁃crystallization time， and accelerated the overall crystallization rate. Isothermal crystallization kinetics indicated that the efficacy of TMC⁃300 is concentration⁃dependent， with an optimal promotion effect observed at 1 wt%， suggesting a saturation concentration within the polymer matrix. Polarized optical microscopy confirmed a substantial increase in nucleation density， leading to smaller spherulite sizes and a faster crystallization rate. These findings demonstrate TMC⁃300's effectiveness in improving the processability of PESOx for commercial applications.

Key words: poly（ethylene succinate?co?ethylene oxalate）, dibenzoyl hydrazide sebacic acid, crystallization behavior, nucleating agent, crystallization kinetics

CLC Number:

TQ323.4

WEI Xuewei, ZHANG Xinwen, YE Haimu, XU Jun, GUO Baohua. Effect of dibenzoyl hydrazide sebacic acid on crystallization properties of poly（ethylene succinate⁃co⁃ethylene oxalate）[J]. China Plastics, 2025, 39(10): 1-5.

Figures/Tables 7

Fig.1. WAXD and TG curves of PESOx5/TMC⁃300 blends

Fig.2. DSC curves of first cooling and second heating of PESOx5 and PESOx5/TMC⁃300 blends

PESOx5

PESOx5/TMC300⁃0.5

PESOx5/TMC300⁃1

PESOx5/TMC300⁃2

103.1

103.2

102.5

103.0

36.74

47.55

49.58

43.50

40.5

61.5

64.9

61.3

7.62

49.20

53.70

47.67

Tab.1. Summary of thermal parameters of PESOx5/TMC⁃300 blends

Fig.3. The relation curves of relative crystallinity and crystallization time of PESOx5，PESOx5/TMC300⁃0.5， PESOx5/TMC300⁃1 and PESOx5/TMC300⁃2 blends

Fig.4. Avrami fitting curves of PESOx5， PESOx5⁃TMC300⁃0.5， PESOx5⁃TMC300⁃1 and PESOx5⁃TMC300⁃2 blends

样品	T_c/℃	n	K/s^⁃ⁿ	t_1/2/s
PESOx5	57	2.0	1.3×10^-3	632
	59	2.3	1.2×10^-3	692
	61	2.5	1.1×10^-3	757
	63	2.7	0.9×10^-3	941
PESOx5/TMC300⁃0.5	75	2.1	9.6×10^-3	88
	77	2.1	6.9×10^-3	122
	79	2.3	3.4×10^-3	253
	81	2.5	2.5×10^-3	344
PESOx5/TMC300⁃1	75	2.3	1.3×10^-2	64
	77	2.2	1.0×10^-2	85
	79	2.2	0.6×10^-2	142
	81	3.1	0.4×10^-2	218
PESOx5/TMC300⁃2	75	2.0	6.6×10^-3	126
	77	1.7	4.0×10^-3	201
	79	2.3	3.1×10^-3	273
	81	1.7	2.2×10^-3	392

Tab.2. Avrami parameters for PESOx5， PESOx5⁃TMC300⁃0.5， PESOx5⁃TMC300⁃1 and PESOx5⁃TMC300⁃2 blends

Fig.5. Spherulite morphologies of PESOx5， PESOx5⁃TMC300⁃0.5， PESOx5⁃TMC300⁃1 and PESOx5⁃TMC300⁃2 blends isothermally crystallized at 75 ℃

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