Thermal and mechanical properties of calcium sulfate whiskers modified PE⁃HD/PA6 composites

doi:10.19491/j.issn.1001-9278.2022.11.006

Abstract

Abstract:

Glycidyl methacrylate （GMA）⁃grafted calcium sulfate whiskers （CSW） was synthesized via chemical modification of CSW with GMA， and its structure and GMA loading were analyzed using Fourier⁃transform infrared spectroscopy and thermogravimetric analysis （TGA）. The CSW and GMA⁃grafted CSW were melt⁃blended with high⁃density polyethylene （PE⁃HD） and polyamide 6 （PA6） to form the PE⁃HD/PA6/CSW composites. The composites were investigated using scanning electron microscopy， differential scanning calorimetry， TGA， and universal testing machine. The results indicated that the PE⁃HD/PA6/GMA⁃grafted CSW composite with a bridge structure exhibited better crystallinity， thermal stability， and mechanical properties. As the length of CSW was greater than the diameter of PA6， the CSW penetrated the PA6 phase to insert into the PE⁃HD phase in the composites， resulting in the formation of the bridge structure. The GMA⁃grafted CSW generated a heterogeneous nucleation effect on the composites， promoting the crystallization process of PA6 and improving its crystallinity accordingly.

Key words: calcium sulfate whisker, modification, high?density polyethylene, polyamide 6, composite

CLC Number:

TQ325.1⁺2

ZHANG Zhaoyang, TANG Gan, KE Xue, WANG Xin, JIANG Xueliang, LIU Fangjun, YOU Feng. Thermal and mechanical properties of calcium sulfate whiskers modified PE⁃HD/PA6 composites[J]. China Plastics, 2022, 36(11): 35-40.

Figures/Tables 9

Fig.1. FTIR spectra of GMA， CSW and G⁃CSW

Fig.2. TG curves of CSW and G⁃CSW

Fig.3. Cross⁃sectional morphologies of the composites

样品	平均粒径/μm
PE⁃HD/PA6（85/15）	3.285
PE⁃HD/PA6/CSW（85/15/10）	3.097
PE⁃HD/PA6/G⁃CSW（85/15/10）	3.700

Tab.1. Average particle size of PA6 particles in PE⁃HD/PA6/CSW three⁃phase system

Fig.4. DSC curves of the samples

Fig.5. PA6 melting peaks of PE⁃HD/PA6/CSW composites with different CSW contents

样品	熔融焓/J·g^-1	结晶度/%
纯PA6	49.04	25.81
PE⁃HD/PA6	48.21	25.40
PE⁃HD/PA6/1 %CSW	45.34	23.84
PE⁃HD/PA6/5 %CSW	42.39	22.33
PE⁃HD/PA6/10 %CSW	44.22	23.25
PE⁃HD/PA6/1 %G⁃CSW	55.91	29.42
PE⁃HD/PA6/5 % G⁃CSW	46.95	24.71
PE⁃HD/PA6/10 % G⁃CSW	45.26	23.83

Tab.2. Crystallinity of PA6 in three⁃phase composites with different CSW contents

Fig.6. Vicat softening temperature and TG curves of the composites

Fig.7. Mechanical properties of the samples

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