Competition of memory effect and thermal degradation on the crystallization behavior of polyphenylene sulfide

Hu, Sihao; Yang, Feng; Xiang, Ming; Cao, Ya; Wu, Tong; Fu, Qiang

doi:10.1016/j.polymer.2022.125427

Cited by 14 publications

(9 citation statements)

References 40 publications

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“…However, we found that the Δ H m was different for each membrane (as shown in Figure c), which meant that the peaks on each curve of Figure a was different. According to the literature, the larger the Δ H m of PPS, the greater the crystallinity of PPS. The crystallinity of as-spun hollow fiber membrane membranes changed significantly compared with the pure PPS hollow fiber membrane, which can be drawn from the Figure c and Figure S11.…”

Section: Results and Discussionmentioning

confidence: 99%

Green Preparation and Porous Structure Construction of Polyphenylene Sulfide Hollow Fiber Membrane via Melt-Spinning and Hot-Stretching Method

Liu,

Zhang,

et al. 2024

ACS Appl. Polym. Mater.

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In this study, we prepared a PPS hollow fiber membrane using green porogenic agents, which did not involve any diluent. The trend of stress variation with stretching ratio was analyzed in detail, and the influence of the coupling of calcium chloride (CaCl 2 ) and poly(ethylene oxide) (PEO) on the formation of the membrane was explained. The prepared PPS hollow fiber membrane exhibited good ethanolophilicity and a narrow pore size distribution. The PPS hollow fiber membrane had good liquid and gas permeability. The results showed that the prepared PPS membranes had good performance in protein separation applications (≥80%) and high breaking strength (24.7−34.2 MPa). The rejection rate of activated sludge, silicon dioxide (SiO 2 ) and calcium carbonate (CaCO 3 ) were 99%, and the rejection rate of Direct Black 19 (D19) dye was 93%. In addition, the prepared hollow fiber membrane has excellent resistance to acid, alkali, high temperature, and polar solvents. We found that the permeability and selectivity of the membranes treated at high-temperature, acid, alkali, and organic solvent, respectively, did not change much. Therefore, the prepared PPS hollow fiber membranes have the potential to be used for water treatment in an extreme environment.

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Section: Results and Discussionmentioning

confidence: 99%

Green Preparation and Porous Structure Construction of Polyphenylene Sulfide Hollow Fiber Membrane via Melt-Spinning and Hot-Stretching Method

Liu,

Zhang,

et al. 2024

ACS Appl. Polym. Mater.

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“…As a consequence, some locally ordered structures persist in the melt, which accelerates crystallization during cooling and leads to a higher initial nucleation density. This peculiar nucleation effect termed as crystalline memory or melt memory in the literature − has been experimentally observed for decades including in PPS ,, ; the effects of the employed premelting temperature ( T p ) on primary nucleation density are usually demonstrated.…”

Section: Discussionmentioning

confidence: 99%

Solid Cure of Poly(phenylene sulfide): Competition between Increasing Nucleation Density and Decreasing Growth Rate

Yin,

Zhao,

Chen

et al. 2024

ACS Appl. Polym. Mater.

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Commercial cured poly(phenylene sulfide) (PPS) is produced by the thermal oxidation treatment of linear PPS in the solid state. Branching and oxidation reactions occur, and correspondingly, the crystallization behaviors of PPS change a lot. A linear pristine PPS and its acid-treated control PPS were carefully designed in this work, and crystallization behaviors of samples with different cure times were systematically investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). It was found that although primary nucleation density increases with cure time for both groups, T c showed a decreasing trend for cured acid-treated PPS while an increasing trend for cured pristine PPS. The isothermal crystallization kinetics were quantitatively characterized based on the Avrami equation and Lauritzen−Hoffman secondary nucleation theory. It was shown that the spherulite growth dimension decreases with cure time and the growth rate decreases contrary to the rising secondary nucleation rate. The competitive results between increasing primary nucleation density and decreasing growth rate gave different isothermal crystallization rate versus cure time patterns for these two groups. Specifically, for cured acid-treated PPS, the crystallization rate first decreased, then increased, and finally decreased again, which is different from previous reports. Besides, the spherulites became gradually more irregular along with the growing nucleation density. We also found that enhanced melt memory accounts for the increasing nucleation density. It is proposed that lamellar crystals are cross-linked by curing reactions, making them more difficult to melt or fully relaxed. Thus, more local ordered structures are formed in premelting, which behave as nucleation sites.

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“…Crystallisation and melting of PPS originate from the transformation between the fully entangled Gaussian chain melt and the extended-chain crystal [64]. The motivation for this transformation is a local ordered conformation with a lower surface free energy barrier for initiating nucleation than the fully entangled random coil conformation [64]. This transformation corresponds to decreased entanglement of the PPS chains.…”

Section: Evolution Of the Entanglement Density Of Pps During Injectio...mentioning

confidence: 99%

Simulating the replication and entanglement of semi-rigid polymers in nano-injection moulding

Jiao,

2024

Modelling Simul. Mater. Sci. Eng.

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Many polymers have been used to design polymer/metal composite structures with high bond strength through nano-moulding technology. However, whether high-molecular-weight polymers flow deeply into nanostructures and whether polymer entanglement hinders complete infiltration remain contentious issues in theoretical studies. In this study, the effects of the injection pressure, molecular weight of the semi-rigid polymer [polyphenylene sulfide (PPS)], and nanostructure size of the metal surface on the replication quality were investigated by molecular dynamics simulations. Increasing the injection pressure and polymer molecular weight increased the replication quality at practical temperatures. PPS with various chain lengths could completely infiltrate the nanopores. The nanostructure size of the metal surface was weakly negatively correlated with the filling rate, but it was substantially negatively correlated with the infiltration behaviour of the entire PPS chain. The reasons for infiltration of long-chain PPS and the steady evolution of the entanglement density were investigated. The steady entanglement density of PPS indicates that entanglement is not the main reason for the low filling rate. From the mobility of a single chain, the PPS chain flows into nanopores in a snake-like fashion. These results provide new insights to improve the adhesion strength between polymers and metals in nano-injection moulding.

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Competition of memory effect and thermal degradation on the crystallization behavior of polyphenylene sulfide

Cited by 14 publications

References 40 publications

Green Preparation and Porous Structure Construction of Polyphenylene Sulfide Hollow Fiber Membrane via Melt-Spinning and Hot-Stretching Method

Green Preparation and Porous Structure Construction of Polyphenylene Sulfide Hollow Fiber Membrane via Melt-Spinning and Hot-Stretching Method

Solid Cure of Poly(phenylene sulfide): Competition between Increasing Nucleation Density and Decreasing Growth Rate

Simulating the replication and entanglement of semi-rigid polymers in nano-injection moulding

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