TY  - EJOU
AU  - Bhagavathi, Lakshmana Rao 
AU  - Gouse, Sk. 
AU  - Siva, T. 
AU  - Khan, Mohammad Faseeulla 

TI  - Tamarindus Indica Bark Powder as a Sustainable Bio-Based Filler for Enhancing Bondline Uniformity and Performance of Polyurethane Adhesives in Wood Bonding
T2  - Journal of Polymer Materials

PY  - 
VL  - 
IS  - 
SN  - 0976-3449

AB  - Polyurethane (PU) adhesives are extensively used in wood bonding due to their high reactivity and strong adhesion. However, excessive penetration of the adhesive into the wood substrate often results in non-uniform bondline thickness, which can compromise joint performance. The use of environmentally compatible fillers offers a sustainable approach to address this limitation. In the present study, Tamarindus indica bark powder was used as a natural filler to achieve uniform bondline thickness in PU-bonded joints. Lap-shear joints were produced using untreated and treated bark powders at varying weight fractions, reinforced within a one-component moisture-curing PU adhesive. The mechanical performance and bondline morphology of these joints were systematically evaluated and compared with PU joints reinforced with microcrystalline cellulose. Further, Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) of all the samples were performed. Results indicate that the addition of bark powder enhances bondline uniformity, improves lap-shear strength, and increases thermal stability compared to unreinforced PU samples. The results demonstrate that Tamarindus indica bark powder can effectively enhance bondline uniformity, mechanical strength, and thermal stability, establishing it as a viable bio-based reinforcement for advanced PU adhesive systems in wood bonding applications.
KW  - Polyurethane adhesives; wood bonding; bondline thickness; Tamarindus indica bark powder; green fillers; microcrystalline cellulose

DO  - 10.32604/jpm.2026.088128