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• W3097308636 endingPage "123173" @default.
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• W3097308636 abstract "As a widely-used engineering thermoplastic, polyamide 6 (PA6) is prone to hydrolysis in acidic and alkaline solvents, precluding its application in both acidic and alkaline environments. Polymer blending is an interesting strategy to fabricate high-performance polymer composites, while it is of challenge to achieve satisfactory properties via simple polymer blending technologies. Here, we report a chemical-resistant PA6/Polyketone (PK) composite with gradient encapsulation structures that is available by both high-pressure capillary extrusion and injection molding. Processing conditions including interfacial tension, viscosity ratio of polymer pairs, and shear rate during melt processing were taken into account to study the formation mechanism of such a special structure. It was revealed that the gradient encapsulation structure can be formed at a critical shear rate of beyond 200 s −1 and the critical viscosity above 5.8. Owing to the interesting gradient encapsulation structure (PK sheath and PA core), the obtained PA6/PK composites showed superior chemical-resistant performance upon formic acid immersion due to the formation of PK “sheath”. This work provides a facile strategy to fabricate PA6 materials with outstanding chemical resistance and mechanical properties by rapid and scalable melt processing methods. • PA6/PK composite with gradient encapsulation structure was obtained by high-pressure capillary and injection molding. • The formation mechanism of the “viscous encapsulation” was studied. • The PA6/PK composite with desired structure showed excellent chemical resistance and mechanical properties." @default.
• W3097308636 created "2020-11-09" @default.
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• W3097308636 date "2021-01-01" @default.
• W3097308636 modified "2023-10-05" @default.
• W3097308636 title "Chemical-resistant polyamide 6/polyketone composites with gradient encapsulation structure: An insight into the formation mechanism" @default.
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• W3097308636 doi "https://doi.org/10.1016/j.polymer.2020.123173" @default.
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