Misra, AnadiMohd Arif2023-02-102023-02-102021-07https://krishikosh.egranth.ac.in/handle/1/5810193599A method of modification of poplar wood veneers (PWVs) was developed through adhesive bonding with bentonite epoxy nanocomposites (BENs).The process of adhesive bonding was executed through alternate laying of BENs across 4- layers of PWVs by pressing at 10kg/cm2 over 24h.This has afforded laminated veneer lumbers (LVLs) with improve mechanical properties, thermal and dimensional stability. LVLs were characterized through Fourier transformed infrared spectroscopy, scanning electron microscopy, and X-ray diffraction. Effect of weight fraction (WF, wt%) of nanobentonite (NB) ranging 0 to 3.0 on mechanical properties, thermal and dimensional stability of LVLs was investigated with reference to PWVs as control. With WF of NB, the LVLs have rendered ultimate modification (%) in their flexural (80.49), tensile (63.81) and impact strength (18.35) at 2.0 WF of NB over PWVs. LVLs at 12 mm thickness with 2 WF of NB has rendered water resistance by 48.97% and thickness swelling (27.46%) over PWVs. Simultaneous thermogravimetric-differential thermal analysis (TG-DTA-DTG) reveals reduction in moisture content of LVLs ranging 4.92 to 1.4 with WF of NB. TG-DTA reveals onset temperature of degradation of LVLs at 200o C with marginal reduction in their heat of fusion over PVWs. DTG reveals thermal degradation (mg/min) of LVLs ranging 0.79 to 0.41 in the temperature range of 287.93 to 294.40oC. TG endset of LVLs was commenced in the temperature range of 485.78 to 600.68o C with heat of fusion (J/mg) ranging 49.5 to 50.8 and average char residue of 3.45% .The present study reveals sustainable modification of PWVs thorough adhesive boding with BENs to deliver the LVLs with improved durability, thermal and dimensional stability.EnglishFabrication and evaluation of nanobentonite/epoxy laminated poplar veneer lumbersThesis