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<p>Mold temperature exerts a decisive influence on the crystallization behavior of injection-molded polyphenylene sulfide/glass fiber (PPS/GF) composite parts. In this study, PPS/GF samples with gradient crystallinity were prepared to systematically investigate the correlation between mold temperature and cold crystallization, and the evolution of crystalline characteristics was correlated with material performance indicators. Combined with the characterization of crystallization behavior, thermal stability, mechanical properties, and micromorphology, the following key findings were obtained: When the mold temperature increased from 80 ℃ to 120 ℃, the cold crystallization degrees of the two types of PPS/GF composites decreased from 7.61% to 8.02% to 1.08% and 1.36%, respectively, cold crystallization of PPS/GF1 completely disappeared at 110&#xa0;°C, while the overall crystallinity increased from 22.33% to 24.38% to 31.08% and 33%, respectively. Crystalline structure analysis showed that the lattice spacing decreased from 8.72&#xa0;nm to 8.78&#xa0;nm to 8.57&#xa0;nm and 8.56&#xa0;nm, while the crystallite size increased from 2.91&#xa0;nm to 4.34&#xa0;nm to 5.59&#xa0;nm and 5.42&#xa0;nm. The reduction in the degree of cold crystallization improved the thermal stability, tensile strength, and flexural strength of the two types of PPS/GF composites, with maximum increases of 38.32% and 14.78%, 8.33% and 88.9%, and 8.45% and 13.29%, respectively, and strengthened the interfacial bonding between the PPS matrix and GF; however, it led to a decrease in notch impact performance, with maximum reductions of 4.49% and 7.01%, respectively. Compositional analysis revealed the cause of performance differences in injection-molded parts under the same process conditions. The results demonstrate that adjusting mold temperature is an effective method to control the cold crystallization of PPS/GF composites; by regulating cold crystallization, the multi-scale properties of injection-molded parts can be optimized, providing theoretical and practical support for the optimization of injection molding processes for PPS/GF composites.</p>

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Controlling cold crystallization in polyphenylene sulfide/glass fiber composites injection moldings: the critical role of mold temperature on crystalline structure and material properties

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Yuting Qiao,
  • Bin Liu,
  • Chenghuan Huang,
  • Jianwen Xu

摘要

Mold temperature exerts a decisive influence on the crystallization behavior of injection-molded polyphenylene sulfide/glass fiber (PPS/GF) composite parts. In this study, PPS/GF samples with gradient crystallinity were prepared to systematically investigate the correlation between mold temperature and cold crystallization, and the evolution of crystalline characteristics was correlated with material performance indicators. Combined with the characterization of crystallization behavior, thermal stability, mechanical properties, and micromorphology, the following key findings were obtained: When the mold temperature increased from 80 ℃ to 120 ℃, the cold crystallization degrees of the two types of PPS/GF composites decreased from 7.61% to 8.02% to 1.08% and 1.36%, respectively, cold crystallization of PPS/GF1 completely disappeared at 110 °C, while the overall crystallinity increased from 22.33% to 24.38% to 31.08% and 33%, respectively. Crystalline structure analysis showed that the lattice spacing decreased from 8.72 nm to 8.78 nm to 8.57 nm and 8.56 nm, while the crystallite size increased from 2.91 nm to 4.34 nm to 5.59 nm and 5.42 nm. The reduction in the degree of cold crystallization improved the thermal stability, tensile strength, and flexural strength of the two types of PPS/GF composites, with maximum increases of 38.32% and 14.78%, 8.33% and 88.9%, and 8.45% and 13.29%, respectively, and strengthened the interfacial bonding between the PPS matrix and GF; however, it led to a decrease in notch impact performance, with maximum reductions of 4.49% and 7.01%, respectively. Compositional analysis revealed the cause of performance differences in injection-molded parts under the same process conditions. The results demonstrate that adjusting mold temperature is an effective method to control the cold crystallization of PPS/GF composites; by regulating cold crystallization, the multi-scale properties of injection-molded parts can be optimized, providing theoretical and practical support for the optimization of injection molding processes for PPS/GF composites.