Comparative Studies on Crystallinity, Thermal and Mechanical Properties of Polyketone Grown on Plasma Treated CVD Graphene.

Sunghun Cho,Jun Seop Lee,Jyongsik Jang,Seorin Park,Hyeji Jang,Ji Hyun An

doi:10.3390/polym13060919

Sunghun Cho, Jun Seop Lee + Show 4 more

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https://doi.org/10.3390/polym13060919

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Abstract

In this work, we report a facile way to control crystalline structures of polyketone (PK) films by combining plasma surface treatment with chemical vapor deposition (CVD) technique. The crystalline structure of PKs grown on plasma-treated graphene and the resulting thermal and mechanical properties were systematically discussed. Every graphene sheet used in this work was produced by CVD method and the production of PKs having different crystallinity were performed on the O2- and N2-doped graphene sheets. It was evident that the CVD-grown graphene sheets acted as the nucleating agents for promoting the crystallization of β-form PK, while suppressing the growth of α-form PK crystals. Regardless of the increase in surface roughness of graphene, surface functionality of the CVD-grown graphene was found to be an important factor in determining the crystalline structure of PK. N2 plasma treatment of the CVD-grown graphene promoted growth of the β-form PK, whereas the O2 plasma treatment of CVD graphene led to transformation of the unoriented β-form PK into the oriented α-form PK. Thus, the resulting thermal and mechanical properties of the PKs were highly dependent on the surface functionality of the CVD graphene. The method of controlling crystalline structure of the PKs suggested in this study, is expected to be very effective in realizing the PK with good processability, heat resistance and mechanical properties.

Highlights

Aliphatic polyketone (PK) is an alternating copolymer composed of units of olefin and carbon monoxide (CO) [1,2,3,4]
In the chemical vapor deposition (CVD) method, the graphene sheets were primarily grown on the copper (Cu) foil and the produced graphene sheets have been transferred onto the glass substrate
The surface of the CVD-grown graphene sheet was treated with an oxygen (O2 ) or nitrogen (N2 ) plasma and these surface-treated graphene sheets can serve as nucleating agents

Summary

Introduction

Aliphatic polyketone (PK) is an alternating copolymer composed of units of olefin and carbon monoxide (CO) [1,2,3,4]. The high melting point of the ethylene-carbon monoxide copolymer is useful for preventing thermal deterioration of the polymer, there is a problem of brittleness, stiffness and processability because of the high degree of crystallization of the ethylenecarbon monoxide copolymer [2,3,4]. To solve this problem, the latter generation PK could be achieved by adding a small amount of propylene monomer to the PK backbone.

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