Influence of Thermal Cross‐Linking Temperature on the Crystallization Behavior of Poly(phenylene sulfide)

Abstract

The isothermal and nonisothermal crystallization behaviors of poly(phenylene sulfide) (PPS) are systematically investigated by differential scanning calorimetry. The results indicate that the thermal cross-linking temperature have an important impact on crystallization behaviors of PPS apparently. With the increase in the thermal cross-linking temperature, the crystallization properties are promoted. It is attributed to the chemically cross-linking points and formation of network structures during the high thermal cross-linking temperature, which lead to increment of the effective nucleating sites. Meanwhile, kinetic analysis of crystal growth demonstrates that the regime transitions of PPS crystal growth, from regime III to regime II and from regime II to regime I, can be really observed at different thermal cross-linking temperatures, respectively. The temperature of regime III/II and II/I transitions decreases with the increase in cross-linking temperature. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21498; View this article online at wileyonlinelibrary.com. Experimental MATERIALS AND PREPARATIONThe PPS resin powder was obtained from the Deyang Science and Technology (Deyang city, Sichuan province) (People's Republic of China). Its molecular weights are M w = 48 000 and M n = 21 000. The samples were kept at a constant time (5 min) with the different thermal cross-linking temperatures (330, 340, 350, and 360 o C) by the RS600 rotary rheometer (produced by HAAKE in Germany). The PPS samples with the different

Effects of thermal process conditions on crystallinity and mechanical properties in material extrusion additive manufacturing of discontinuous carbon fibre reinforced polyphenylene sulphide composites

“…It is interesting to note that the cross-linking structure in the polymer acts as the nucleating agent first and then hinders the formation of the crystalline structure if the linkages become dominant at elevated temperatures. 31,32 These crosslinking chains could cause the deterioration phenomenon of polymer materials and then have a negative impact on crystallinity, thus reducing the mechanical properties of the printed parts. Results proved that the crosslinking effects performed a key role in determining the crystallinity in a higher nozzle temperature environment, and the degree of crystallinity indicated the mechanical properties.…”

Enhancement of interfacial properties of carbon fiber reinforced polyphenylene sulfide resin by sulfur treatment

“…[4][5][6] Thermoplastic resins offer several advantages, such as fast forming, impact resistant, and easy to recycle, compared to thermoset resin. [7][8][9] Polyphenylene sulfide (PPS) is a high-performance resin, 10,11 and their composites have used in aerospace and civil engineering industries due to their remarkable mechanical properties, high wear resistance, high temperature resistance and corrosion resistance. [12][13][14] The mechanical properties of composite materials are directly determined by the interface between CF and the resin.…”