The Effect of Thermal Degradation Processes on the Physical-Mechanical and Rheological Properties of Polyketone

Vodyakov, Vladimir N.; Kotin, Alexandr V.; Kuznetsov, Vyacheslav V.; Kulikovskaya, Kseniya A.; Radaykina, Elena A.; Murneva, Mariya I.

doi:10.4028/www.scientific.net/kem.869.140

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“…Polyketones (POKs) are a family of semicrystalline polymers prepared by the polymerization of α-olefins and carbon monoxide in a perfectly 1:1 alternating sequence using palladium catalysts. 1 Compared with normal polyolefin materials, strong interactions between the highly polar carbonyl groups of adjacent polymer chains make the copolymer of ethylene and carbon monoxide shows relatively high crystallinity (35%-50% as determined by X-ray diffraction) and a melting temperature of 260 C. 2,3 However, the copolymer shows a very narrow processing temperature range (only 20 C) and easily to be degraded during processing, 4 which is induced by intermolecular and intramolecular reactions, limiting the allowable processing time. 5 To improve the processing stability of POK, Shell commercialized a terpolymer of carbon monoxide, ethylene, and a small amount of propylene in 1996.…”

Section: Introductionmentioning

confidence: 99%

The effect of melt drawing ratio on the crystal structural change and performance of polyketone extrusion cast film

Yin

Chen

et al. 2022

Journal of Polymer Science

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In this paper, the polyketone (POK) extrusion cast film is manufactured by melt stretching method, and the evolution process of the crystal morphology and mechanical properties with the increase of melt drawing ratio (MDR) are followed. The results show that the melt stretching process produces many micro shish-kebab crystals in the POK. The length of the shish crystal and the thickness of the kebab crystal hardly increase with MDR, but the lateral length of the kebab crystal shows linear growth when MDR exceeds 40. The crystalline morphology of POK is mainly affected by melt relaxation. The molecular chain has sufficient relaxation during cooling at a low MDR (20-40). At this time, micro shish-kebab crystals are mainly randomly arranged. When MDR exceeds 40, the rapid melt stretching shortens the relaxation time of the tie chain between the neighborhood shish crystal, and the atomic force microscopy image shows a typical shish-kebab structure. This experimental result indicates that the formation of the oriented lamella structure may be related to the relaxation of the molecular chains between the micro-shish. When the length of the shish axis and the thickness of the kebab lamellae are similar, it is difficult to distinguish the two.

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Section: Introductionmentioning

confidence: 99%

The effect of melt drawing ratio on the crystal structural change and performance of polyketone extrusion cast film

Yin

Chen

et al. 2022

Journal of Polymer Science

View full text Add to dashboard Cite

show abstract

The Effect of Thermal Degradation Processes on the Physical-Mechanical and Rheological Properties of Polyketone

Abstract: The effect of polyketone thermal processing duration on the rheological properties of the melts and the physical and mechanical characteristics of the samples, obtained by injection and compression molding methods, is studied.

Cited by 1 publication

References 9 publications

The effect of melt drawing ratio on the crystal structural change and performance of polyketone extrusion cast film

The effect of melt drawing ratio on the crystal structural change and performance of polyketone extrusion cast film

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