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Improved recovery stress in multi-walled-carbon-nanotubes reinforced polyurethane
Graphical abstract Display Omitted
Highlights Studied recovery stress of CNT reinforced SMTPU under large deformations. New deformations scheme yielded more than 50% improvement in recovery stress. Entire thermo-mechanical programmed cycle of process was performed in liquid medium.
Abstract The shape-recovery performance of multi-walled-carbon-nanotubes (MWCNT) reinforced shape-memory-thermoplastic-polyurethane (SMTPU) was investigated for modified Shape-Memory-Creation-Procedure (SMCP). The modified SMCP replaced the conventional stretching scheme of deformation which is generally employed to attain temporary-shape. A Progressive-Stretch-Relax-Stretch (PSRS) scheme of deformation was introduced to create temporary shape in SMTPU and MWCNT-SMTPU nanocomposites. As compared to the conventional deformation, PSRS deformation exhibited more than 50% increase in the recovery-stress in all the composites. The cast-films of SMTPU having 0, 1, 2, 3 and 5 phr MWCNT were prepared. Significant improvement in recovery-stresses was also observed with the increased content of MWCNT. DSC studies revealed increased glass-transition temperature with MWCNT content. These composites exhibited higher values of shape-fixity with increased content of MWCNT. The samples prepared under PSRS scheme, having 5 phr MWCNT in SMTPU, attained high recovery stress 6.95MPa as compared to 3.68MPa with conventional method at 780% strain of the sample.
Improved recovery stress in multi-walled-carbon-nanotubes reinforced polyurethane
Graphical abstract Display Omitted
Highlights Studied recovery stress of CNT reinforced SMTPU under large deformations. New deformations scheme yielded more than 50% improvement in recovery stress. Entire thermo-mechanical programmed cycle of process was performed in liquid medium.
Abstract The shape-recovery performance of multi-walled-carbon-nanotubes (MWCNT) reinforced shape-memory-thermoplastic-polyurethane (SMTPU) was investigated for modified Shape-Memory-Creation-Procedure (SMCP). The modified SMCP replaced the conventional stretching scheme of deformation which is generally employed to attain temporary-shape. A Progressive-Stretch-Relax-Stretch (PSRS) scheme of deformation was introduced to create temporary shape in SMTPU and MWCNT-SMTPU nanocomposites. As compared to the conventional deformation, PSRS deformation exhibited more than 50% increase in the recovery-stress in all the composites. The cast-films of SMTPU having 0, 1, 2, 3 and 5 phr MWCNT were prepared. Significant improvement in recovery-stresses was also observed with the increased content of MWCNT. DSC studies revealed increased glass-transition temperature with MWCNT content. These composites exhibited higher values of shape-fixity with increased content of MWCNT. The samples prepared under PSRS scheme, having 5 phr MWCNT in SMTPU, attained high recovery stress 6.95MPa as compared to 3.68MPa with conventional method at 780% strain of the sample.
Improved recovery stress in multi-walled-carbon-nanotubes reinforced polyurethane
Hashmi, S.A.R. (author) / Prasad, Harish Chandra (author) / Abishera, R. (author) / Bhargaw, Hari Narayan (author) / Naik, Ajay (author)
2014-10-23
9 pages
Article (Journal)
Electronic Resource
English
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