Preparation and Property study of Polyurethane Reticulated Foam Modified by Macromolecular Hindered Phenol Functionalized Carbon Nanotubes
Poly(2-hydroxyethyl methacrylate)(PHEMA)was grafted onto γ-aminopropyl trimethoxysilane(APTMS)functionalized carbon nanotubes(CNTs)by surface-initiated oxidation-reduction polymerization.Then 3,5-di-tert-butyl-4-hydroxybenzoic acid(CNTs-PHEMA-g-AO-e)was grafted by esterification.The effects of CNTs-PHEMA-g-AO-e on the apparent density,mechanical properties,antistatic and aging resistance of polyurethane(PU)reticulated foam were studied in detail.The results showed that functionalized CNTs with grafting rate of AO-e of 8%were successfully prepared by surface-initiated oxidation-reduction polymerization and esterification.With the increase of CNTs-PHEMA-g-AO-e content,the apparent density was gradually increased before and after netting,the density difference was decreased first and then increased,the tensile strength and compressive strength was first increased and then decreased,the compression set was first decreased and then increased,and the elongation at break decreased obviously.When the content of CNTs-PHEMA-g-AO-e was 4%,the tensile strength of PU reticulated foam was 262.6 kPa,the elongation at break was 122.7%,the compressive strength at 65%set deformation was 8.6 kPa and the compression set was 15.6%.Compared with PU network foam directly added with AO-e,the antistatic property was improved,the volume resistivity was decreased by 10 orders of magnitude,and the aging resistance was significantly enhanced in the presence of CNTs-PHEMA-g-AO-e.
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