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• W2897764037 endingPage "E31" @default.
• W2897764037 startingPage "E25" @default.
• W2897764037 abstract "Polyamide 6 (PA6) is an important engineering thermoplastic, very widely used but prone to thermal degradation during extrusion at temperature not far from its melt temperature (220°C). Typically, and as measured in this study, PA6 extruded at temperature of 300°C shows a 40% decrease in tensile modulus compared with non-extruded PA6. To rebuild PA6 molecular weight, the easiest and cheapest method is to use an appropriate chain extender. Many chain extenders have been used in the past but they are essentially suited to nucleophile induced degradation, targeting split PA6 chains carboxyl COOH and amine NH2 end groups. What have been lacking are effective chain extenders for thermally only induced degradation, i.e. for the practical cases where the PA6 is thoroughly dried before extrusion. For such a case, the degradation reaction mechanism dictates that the solution is to develop chain extenders that target the split PA6 chains amide CONH2 groups not the carboxyl COOH and amine NH2 end groups. As amide groups strongly react with anhydride functionalities, we test the effectiveness of a novel chain extender, Joncryl® ADR 3400, a styrene maleic anhydride copolymer with multiple, repeating anhydride functionality. Assessment of chain extension in this study is done as with previous work, using rheology, mechanical and thermal properties of PA6 extruded on its own and with the chain extender. The viscoelastic data conclusively show the efficacy of such chain extender with more than 10-fold changes in the comparative values of the extruded sample storage modulus G’ and as much as an 85% increase in the tensile modulus. POLYM. ENG. SCI., 59:E25–E31, 2019. © 2018 Society of Plastics Engineers" @default.
• W2897764037 created "2018-10-26" @default.
• W2897764037 creator A5039742015 @default.
• W2897764037 creator A5041608620 @default.
• W2897764037 date "2018-10-17" @default.
• W2897764037 modified "2023-10-02" @default.
• W2897764037 title "Reactive Extrusion of Polyamide 6 Using a Novel Chain Extender" @default.
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• W2897764037 doi "https://doi.org/10.1002/pen.24944" @default.
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