Plasticisation and compatibilisation of poly(propylene) with poly(lauryl acrylate) surface modified MWCNTs

POLYMER

卷:133

Article

Gupta, Jaipal¹  Wan, Chaoying¹  Haddleton, David M.²  McNally, Tony¹ 

[1] Univ Warwick, IINM, WMG, Coventry CV4 7AL, W Midlands, England

[2] Univ Warwick, Dept Chem, Lib Rd, Coventry CV4 7AL, W Midlands, England

关键词: Poly(propylene);    Multi-walled carbon nanotubes;    Nanocomposites;    Poly(lauryl acrylate);    Non-covalent functionalisation;    Percolation threshold;    Plasticisation;    Interface;    Electrical conductivity;   

DOI  :  10.1016/j.polymer.2017.11.025

来源: Elsevier

【 摘 要 】

Poly(lauryl acrylate) P[LA] synthesised using Cu(0)-mediated polymerisation was used to non-covalently functionalise multi-walled carbon nanotubes (MWCNTs) achieved via combined CH-pi interactions and physical wrapping. The inclusion of P[LA] competed with the attractive van der Waals forces between MWCNTs altering interfacial interactions between neighbouring CNTs and, assisted their dispersion and distribution in a poly(propylene) (PP) matrix, confirmed from SEM/HR-TEM imaging and oscillatory rheology measurements. A rheological percolation threshold measured for composites of unmodified MWCNTs and PP at similar to 0.5 wt% was shifted to lower MWCNT concentrations (similar to 0.25 wt%) for P[LA] functionalised MWCNTs. Addition of P[LA] also reduced the nucleating effect of MWCNTs for PP as a coating of P[LA] on the nanotube surfaces hindered trans-crystallisation of the PP. Evidence from static and dynamic mechanical measurements confirmed the P[LA] plasticised PP as both an increase in ductility and a decrease in the glass transition temperature (T-g) of PP of up to 25 degrees C was obtained. Addition of unmodified MWCNTs to PP resulted in an increase in the DC electrical conductivity of PP of 15 orders of magnitude, from 10(-14) S/m to 10(1) S/m for a MWCNT loading of 5 wt%. Non-covalent functionalisation of MWCNTs utilising P[LA] only degraded electrical conductivity by about 2 orders of magnitude across the composition range. (C) 2017 Elsevier Ltd. All rights reserved.

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