Morphology and Mechanical Properties of the Polyketone/Polycarbonate Blends Compatibilized with Polyamides
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DOI 10.1007/s13233-020-8143-8
www.springer.com/13233 pISSN 1598-5032 eISSN 2092-7673
Morphology and Mechanical Properties of the Polyketone/Polycarbonate Blends Compatibilized with Polyamides Dong Chan Seo Ikseong Jeon Seokyoung Bae Jae Young Jho*
School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Korea
Received June 1, 2020 / Revised July 6, 2020 / Accepted July 8, 2020
Abstract: To enhance impact strength of polyketone (PK) without loss of stiffness, PK was blended with polycarbonate (PC) via melt mixing. Three types of polyamides (PAs) with varying structures, - polyamide 6 (PA6), polyamide 612 (PA612), polyamide 12 (PA12) - were employed as polymeric compatibilizers. To elucidate the effect of the structure of PAs on the compatibilization, morphology, mechanical properties, and fracture behavior of the blends were investigated. The addition of PA6 and PA612 reduced the size of dispersed particles by encapsulating the PC phase, while PA12 was found not to affect the morphology of the PK/PC blend. The change in particle size, glass transition temperature (Tg), and elongation at break exhibited that PA6 was the most effective compatibilizer for the PK/PC blends of this study. These results were interpreted with the change in interfacial tension between PK and PA due to the difference in polarity of the PAs. It was found that the impact strength was not highest in the blend with the smallest particle size. The observation of sub-surface damage zone also indicated that effective toughening by intensive crazing in polymer blends requires dispersed particles of optimum size. Keywords: polyketone, polycarbonate, blend, compatibilizer, polyamide.
1. Introduction Aliphatic polyketone (PK) is a semicrystalline polymer composed of carbon monoxide, ethylene, and a small amount of propylene. PK has better abrasion resistance, chemical resistance, gas permeability compared to other engineering plastics, and its mechanical properties are comparable to polyamides and polyesters.1-4 Taking advantage of these attractive properties, PK is being exploited in applications as wear resistant, packaging, and engineering materials. On the other hand, the impact strength of PK is relatively low compared to tough engineering plastics such as poly(acrylonitrile-butadiene-styrene) (ABS) and polycarbonate (PC), and toughening of PK is necessary for use in applications requiring high impact strength. Efforts have been made to enhance the impact strength of PK by blending with other polymers. Various elastomers like polybutadiene core with a styrene-acrylonitrile shell rubber, maleic anhydride-grafted ethylene-octene rubber, and ethylene/methacrylic acid copolymer have been incorporated for toughening of PK.5-7 Although these blends showed a significant increase in impact strength, it was unavoidable to be accompanied by a loss of modulus and tensile strength. As an approach to enhance the impact strength of PK withAcknowledgments: This research was supported by a grant from the Fundamental R&
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