首页|Impact of Carbon Chain Structures in the Backbone on the Flexibility of Modified Polyarylene Sulfide Resins:Molecular Dynamics Simulations and Mesoscopic Analysis
Impact of Carbon Chain Structures in the Backbone on the Flexibility of Modified Polyarylene Sulfide Resins:Molecular Dynamics Simulations and Mesoscopic Analysis
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In the domain of high-performance engineering polymers,the enhancement of mechanical flexibility in poly(phenylene sulfide)(PPS)resins has long posed a significant challenge.A novel molecular structure,designated as PP-He-IS,wherein imide rings and an aliphatic hexylene chain are covalently incorporated into the PPS backbone to enhance its flexibility,is introduced in this study.Molecular dynamics(MD)simula-tions are employed to systematically explore the effects of diversifying the backbone chain structures by substituting phenyl units with alkyl chains of varying lengths,referred to as PP-A-IS where"A"signifies the distinct intermediary alkyl chain configurations.Computational analyses reveal a discernable decrement in the glass transition temperature(Tg)and elastic modulus,counterbalanced by an increment in yield strength as the alkyl chain length is extended.Notably,the PP-He-IS variant is shown to exhibit superior yield strength while simultaneously maintaining re-duced elastic modulus and Tg values,positioning it as an advantageous candidate for flexible PPS applications.Mesoscopic analyses further indi-cate that structures such as PP-He-IS,PP-Pe-IS,and PP-Bu-IS manifest remarkable flexibility,attributable to the presence of freely rotatable carbon-carbon single bonds.Experimental validation confirms that a melting temperature of 504 K which is lower than that of conventional PPS,and lower crystallinity are exhibited by PP-He-IS,thereby affording enhanced processability without compromising inherent thermal stability.Novel insights into the strategic modification of PPS for mechanical flexibility are thus furnished by this study,which also accentuates the pivotal role played by molecular dynamics simulations in spearheading high-throughput investigations in polymer material modifications.
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