Hygrothermal aging, fatigue and dynamic mechanical behavior of cellulosic particles reinforced one-component moisture curable polyurethane adhesive joints

Microcrystalline cellulose (MCC) and sawdust (SD) green fillers have great potential to act as moisture reservoirs and reactive fillers. In the present study, a one-component moisture curable polyurethane (PU) adhesive was reinforced with MCC and SD fillers. The durability of aluminum/steel joints p...

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Bibliographic Details
Published inInternational journal of adhesion and adhesives Vol. 105; p. 102771
Main Authors Bhagavathi, Lakshmana Rao, Deshpande, Abhijit P., Janaki Ram, G.D., Panigrahi, S.K.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.03.2021
Elsevier BV
Subjects
Adhesive joints
Adhesive strength
Adhesives
Aging
Aluminum
Crystalline cellulose
Dissimilar joining
Dynamic mechanical analysis
Fatigue tests
Fillers
Fourier transforms
Glass transition temperature
Green fillers
Infrared spectroscopy
Mechanical properties
Moisture
Polyurethane
Polyurethane resins
Sawdust
Shear tests
Infrared spectroscopy
Dissimilar joining
Polyurethane
Green fillers
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Summary:Microcrystalline cellulose (MCC) and sawdust (SD) green fillers have great potential to act as moisture reservoirs and reactive fillers. In the present study, a one-component moisture curable polyurethane (PU) adhesive was reinforced with MCC and SD fillers. The durability of aluminum/steel joints produced using unreinforced and reinforced PU adhesives was studied using dynamic mechanical analysis (DMA), fatigue, and hygrothermal aging experiments. Lap-shear tests were conducted to evaluate the effects of aging on joints strength. Fourier-transform infrared spectroscopy (FTIR) experiments were performed on adhesive joints after hygrothermal aging to understand the changes in chemical structure due to aging, and the influence of cellulosic fillers on the aging phenomena. DMA results showed that the glass transition temperature of the reinforced PU was similar to that of the unreinforced PU. Fatigue performance of MCC and SD reinforced PU adhesive joints was found to be better than unreinforced PU joints. Further, MCC reinforced PU adhesive joints were found to be more resistant to hygrothermal aging than SD reinforced and unreinforced PU joints. Overall, MCC reinforced PU adhesive joints exhibited good fatigue and superior long-term properties.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2020.102771