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纳米力学科学与技术:国际期刊
ESCI SJR: 1.031 SNIP: 1.517 CiteScore™: 0.7

ISSN 打印: 2572-4258
ISSN 在线: 2572-4266

纳米力学科学与技术:国际期刊

Formerly known as Nanomechanics Science and Technology: An International Journal

DOI: 10.1615/NanoSciTechnolIntJ.2019031314
pages 157-168

FABRICATION AND CHARACTERIZATION OF POLYVINYL ALCOHOL INFILTRATED POLYURETHANE FOAMS FOR ENERGY ABSORPTION APPLICATIONS

Jasdeep Bhinder
Mechanics of Advanced Material Laboratory, Department of Mechanical Engineering, Indian Institute of Technology, Ropar, Rupnagar (140001), Punjab, India
Prabhat Agnihotri
Mechanics of Advanced Material Laboratory, Department of Mechanical Engineering, Indian Institute of Technology, Ropar, Rupnagar (140001), Punjab, India

ABSTRACT

The present research is aimed at fabricating and characterizing PU/PVA composites. This is achieved through partial infiltration of PU foam with PVA solution in varying wt.% (1, 5, and 10). The PVA infiltrated PU foam samples are freezed followed by freeze drying. The PVA infiltration leads to a rise in the density conforming partial infiltration of PVA to PU foam. The microstructure and compressive mechanical properties of PVA infiltrated PU foam is compared with a neat PU foam. The microstructure of a PVA infiltrated PU foam shows hierarchical microstructure with small pores of PVA (40–50 μm) engulfed within larger pores of PU foam (500–600 μm). The uniaxial multiple cycle compression tests are carried out at a strain rate of 0.02 s–1. The specific elastic modulus, specific plateau stress, and specific densification showed a rise of 41%, 17%, and 5% for 1 wt.% with respect to the neat PU foam sample. A 1 wt.% PVA infiltrated sample shows the energy loss coefficient comparable to the neat PU foam during each cycle. This can be attributed to formation of stiffer cell walls with PVA infiltration. The peak efficiency parameter, indicating the absorbed energy normalized with peak stress shows an increase of 5% that to even at stress values similar for the neat PU foam sample.

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