Effect of High Temperature Antioxidant on Structure and Properties of Polyphenylene Sulfide

doi:10.19491/j.issn.1001-9278.2021.04.014

Abstract

Abstract:

Aiming at the oxidation characteristics of polyphenylene sulfide （PPS）， a high temperature antioxidant GA?80 was used to compound with PPS by melt blending with a micro twin?screw extruder. The effect of GA?80 on the morphology， crystallization behavior， thermo?oxygen stability， dynamic oxidation induced temperature and surface element changes of PPS was investigated by field emission scanning electron microscopy， differential scanning calorimeter and X?ray photoelectron spectrometer. The results indicated that GA?80 had good compatibility with the PPS matrix and could be homogeneously dispersed in the matrix without obvious agglomeration. The effect of GA?80 on crystallization changed from inhibition to promotion with an increase in the content of GA?80. The crystallization temperature and crystallinity decreased at first and then tended to increase， whereas the degree of supercooling presented an opposite variation trend. The addition of GA?80 improved the thermal?oxygen stability of PPS， and the dynamic oxidation induced temperature of PPS increased with an increase in the content of GA?80. When the content of GA?80 was 5.0 wt%， the dynamic oxidation induced temperature increased by 19.4 ℃ compared to pure PPS. Moreover， GA?80 could inhibit the combination of S and O elements from the PPS macromolecular chains and environment， respectively， and it could also eliminate the free radicals to improve oxidation resistance.

Key words: polyphenylene sulfide, high temperature antioxidant, crystallization behavior, dynamic oxidation induced temperature, oxidation resistance

CLC Number:

TQ 326.5

XING Jian, ZHANG Shucheng, YU Qin, LI Changlong, XU Zhenzhen. Effect of High Temperature Antioxidant on Structure and Properties of Polyphenylene Sulfide[J]. China Plastics, 2021, 35(4): 79-85.

Figures/Tables 10

Fig.1. Structural formula of antioxidants GA?80

Fig.2. TG and DTG curves of antioxidants GA?80

Fig.3. SEM of pure PPS and PPSGx composites

Fig.4. DSC curves of pure PPS and PPSGx composites

样品	T_c/^oC	ΔH_c/J·g^-1	T_m/^oC	ΔH_m/J·g^-1	X_c/%	ΔT/^oC
PPS	221.1	43.6	277.2	36.3	46.8	56.1
PPSG_0.5	218.7	43.2	276.9	34.9	45.3	58.2
PPSG₁	215.9	43.6	275.9	32.9	42.9	60.0
PPSG₃	218.2	41.8	276.0	32.7	43.5	57.8
PPSG₅	223.6	44.5	277.2	39.3	53.4	53.6

Tab. 1. DSC characteristic parameters of PPS and PPSGx composites

Fig.5. Thermal?oxidation weigh loss curves of PPS and PPSGx composites

样品	T_i /℃	T_5% /℃	T_15% /℃	T_30% /℃
PPS	483.4	510.4	531.2	553.3
PPSG_0.5	395.6	502.5	526.8	547.5
PPSG₁	385.2	503.4	528.7	551.5
PPSG₃	369.5	497.9	530.7	554.3
PPSG₅	379.6	495.5	526.8	551.1

Tab.2. Thermal?oxidation weigh loss parameters of PPS and PPSGx composites

Fig.6. Dynamic oxidation induction temperature curves of PPS and PPSGx composites

Fig.7. XPS of PPS and PPSGx composites

Fig.8. XPS of S2p in PPS and PPSGx composites

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