Effect of compatibilizers on properties of glass⁃fiber⁃reinforced polyoxymethylene composites

doi:10.19491/j.issn.1001-9278.2022.01.008

Abstract

Abstract:

Silane coupling agent （KH550 and KH560） and polymer interfacial compatibilizer M were used to modify the glass fiber reinforced polyformaldehyde composites （POM/GF）， and the mechanical properties of the resultant compo?sites were investigated using an electronic universal testing machine and a pendulum impact testing machine. Scanning electron microscopy， rotating rheometer and differential scanning calorimetry were conducted to investigate the effects of the type and content of compatilizer on the profile， rheological behavior， crystallization properties， and dynamic thermomechanical properties of the composites. The results indicated that the polymer compatilizer M had a better compatilizing effect on the POM/GF composites than the small molecules KH550 and KH560. The tensile strength， bending strength and notched impact strength of the POM/GF composites containing 0.5 wt % M reached 120.9 MPa， 170.5 MPa and 8.58 kJ/m²， respectively， which were increased by 14.2 %， 19.1 % and 32.3 %， respectively， compared to the composite without M. In addition， the incorporation of M increased the crystallization temperature of the composites， reduced their crystallinity， and promoted their crystallization process.

Key words: polyformaldehyde, glass fiber, interfacial compatibilizer, mechanical property, crystallization property

CLC Number:

TQ326.51

WANG Zhenhua, YANG Zheng, JU Aoying, LU Shike, LIU Baoying, FANG Xiaomin, DING Tao, XU Yuanqing. Effect of compatibilizers on properties of glass⁃fiber⁃reinforced polyoxymethylene composites[J]. China Plastics, 2022, 36(1): 53-60.

Figures/Tables 9

样品编号	POM含量/%	GF含量/%	KH550含量/%	KH560含量/%	M含量/%	加工助剂含量/%
POM/GF	79.1	20	0	0	0	0.9
POM/GF/KH550（0.5）	78.6	20	0.5	0	0	0.9
POM/GF/KH550（2）	77.1	20	2	0	0	0.9
POM/GF/KH560（0.5）	78.6	20	0	0.5	0	0.9
POM/GF/KH560（2）	77.1	20	0	2	0	0.9
POM/GF/M（0.5）	78.6	20	0	0	0.5	0.9
POM/GF/M（2）	77.1	20	0	0	2	0.9

Tab.1. Formula of POM/GF composites

Fig.1. Effects of different types and contents of compatibilizers on mechanical properties of POM/GF composites

Fig.2. SEM of impact fracture surface of POM/GF composites with different compatibilizers of 2 % loading，respectively

Fig.3. SEM of impact fracture surface of POM / GF composites with different compatibilizers of 0.5 % loading，respectively

Fig.4. Rheological curves of POM/GF composites with different compatibilizers of 2 % loading，respectively

Fig.5. Rheological curves of POM/GF composites with different compatibilizers of 0.5 % loading，respectively

Fig.6. Crystallization and melting curves of POM/GF composites

样品	T_c/℃	ΔH_c/ J?g^-1	T_m/℃	ΔH_m/ J?g^-1	X_c/%
POM/GF	144.4	110.4	167.9	129.2	49.5
POM/GF/KH550（2）	146.8	104.3	166.5	107.6	42.3
POM/GF/KH560（2）	147.7	105.3	167.9	108.9	42.8
POM/GF/M （2）	145.6	93.4	166.0	91.6	36.0
POM/GF/KH550（0.5）	144.9	95.1	167.9	99.3	38.3
POM/GF/KH560（0.5）	146.2	104.4	167.2	111.1	42.9
POM/GF/M（0.5）	146.5	98.8	166.1	93.7	36.1

Tab.2. DSC data of POM/GF composites with different compatibilizers

Fig.7. Dynamic thermomechanical properties of POM/GF composites with 0.5 % compatibilizer

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