Research On The Preparation Of Polysilane/CNTs/PMMA Composite Materials Via In-Situ Polymerization

Polysilane is σ-electron conjugated system which is similar to π-electronconjugated system. Many of its properties depend on the electronegativity ofsilicon atoms in the main chain and the empty3d orbitals. Carbon nanotubes(CNTs) have both excellent conductivity and high stability. They exhibit themetallic and semi-conductive for π electron delocalization. They areconsidered to be the ideal one-dimensional quantum wires. So far, the researcheson application of polysilane have not been frequent. Combine polysilane andcarbon nanotubes and further add the complexes to PMMA, and then did theexperimentally investigation for the formed complexes, which will expand theresearch space of polysilane as new polymer materials as well as its applicationspace.This work mainly aimed at recombination of polysilane, carbon nanotubesand PMMA to conduct fundamental research. Dichlorosilane which containedfour substitutes respectively (diphenyl, methyl vinyl, methyl phenyl and dimethyl)was taken as monomer, carbon nanotubes were first added to polysilane via situpolymerization, then the complexes were added to PMMA and thenpolysilane/CNTs/PMMA composite materials were synthesized.By investigating the reaction time, conductivity, yield and contrast tests ofdifferent doping methods, synthetic route to reinforcement was determined usingmethylvinyldichlorosilane and methylphenyldichlorosilane as starting materials.MMA, the monomer of the substrate PMMA, was used as the initial rawmaterial, dibenzoyl peroxide as initiator, polysilane/CNTs/PMMA composite materials were prepared successfully via in-situ polymerization. Some of theperformance in mechanics, electricity and thermodynamics was characterized.The results show that polysilane/CNTs complexes could be dispersed inPMMA well and there is interaction between polysilane/CNTs complexes withPMMA. With the amount increase of polysilane/CNTs complexes, the maximumdecomposition temperature, Vicat softening point and impact resistance ofPMMA are all enhanced. The conductivity of PMMA was increased by twoorders of magnitude after adding polysilane/CNTs complexes.