Effect of initiator on the structure and properties of PBS⁃g⁃HDDA

doi:10.19491/j.issn.1001-9278.2025.12.010

Abstract

Abstract:

Hexanediol diacrylate （HDDA） was grafted onto poly（butylene succinate）（PBS） using dibenzoyl peroxide （BPO） as an initiator via reactive melt grafting. The successful grafting of HDDA without gelation was confirmed by Fourier⁃transform infrared spectroscopy， ¹H⁃NMR， and gel content analysis. A quantitative model established in TQ Analyst software （correlation coefficient=0.989 6） determined a grafting rate of 0.83 % under optimal conditions （100 ppm PBS， 3 phr HDDA， 0.3 phr BPO）. The introduction of long⁃branched chains reduced the crystallinity of PBS， as characterized by differential scanning calorimetry and wide⁃angle X⁃ray diffraction， while also providing physical entanglement points that promoted nucleation. The grafting process significantly increased the melt strength， evidenced by a rise in torque from 1.73 N·m to 8.17 N·m. Gel permeation chromatography revealed an increase in molecular weight， resulting in a number⁃average molecular weight of 44 825 g/mol and a weight⁃average molecular weight of 184，921 g/mol. Consequently， the modified PBS exhibited improved mechanical properties， demonstrating that grafting with optimal concentrations of HDDA and BPO is an effective strategy for enhancing the performance of PBS.

Key words: hexanediol diacrylate, poly（butylene succinate）, dibenzoyl peroxide, reaction extrusion, melt strength

CLC Number:

TQ323.4

KE Junmu, LIN Yuanzhi, SU Yuhang, YU Li, HUANG Yifei, WU Binglin, YANG Wenqing. Effect of initiator on the structure and properties of PBS⁃g⁃HDDA[J]. China Plastics, 2025, 39(12): 56-63.

Figures/Tables 15

样品编号	PBS/份	HDDA/份	BPO/份
1	100	0	0
2	100	0	0.3
3	100	2	0.3
4	100	3	0.3
5	100	4	0.3

Tab.1. Compositions for a preparation of PBS⁃g⁃HDDA

Fig.1. Molecular weight distribution curves of PBS and PBS⁃g⁃HDDA with different contents of HDDA

样品	M_n/g • mol^-1	M_w/g • mol^-1	M_z/g • mol^-1	PDI
1	34 626	98 682	168 893	2.850
2	33 237	137 309	337 446	4.131
3	45 376	196 134	789 229	4.322
4	44 825	184 921	724 509	4.125
5	34 618	185 218	714 142	5.350

Tab.2. Molecular weight of PBS and PBS⁃g⁃HDDA with different contents of HDDA

Fig.2. FTIR of PBS， PBS⁃g⁃HDDA， and HDDA

Fig.3. Standard curves of the samples

Fig.4. 1H⁃NMR spectra of the samples

Fig.5. Proposed grafting mechanism of HDDA onto PBS

Fig.6. Torque curves of the samples

Fig.7. Gel test chart of the samples

Fig.8. DSC thermograms of the samples

样品	T_c/℃	T_m⁃i/℃	T_m⁃ii/℃	ΔH_m/J·g^-1	ΔH_c/J·g^-1	X_c/%
1	71.1	-	113.5	-61.42	77.14	55.68
2	77.9	-	113.1	-58.58	64.91	53.11
3	86.5	105.9	113.5	-56.03	48.59	50.80
4	87.1	106.2	113.1	-56.69	46.57	51.40
5	87.1	106.9	113.2	-56.21	47.61	50.96

Tab.3. Melting and crystallization behavior of PBS and PBS⁃g⁃HDDA

Fig.9. XRD diagram of the samples

Fig.10. The melt flow index of PBS and PBS⁃g⁃HDDA

Fig.11. Mechanical properties of the samples

Fig.12. Stress⁃strain curves of the samples

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