a comparative study on adhesion properties of polyurethane hot-melt adhesives, including c5 and c9 hydrocarbon tackifiers

A series of thermoplastic polyurethane hot-melt adhesive formulations have been synthesized by melt blending of polyether-based thermoplastic polyurethane and 5-20 wt% of  c5 and c9 hydrocarbon tackifier loadings. some analyses, including t-peel strength with polyester fabric, rotational rheometry, and dsc, are conducted to compare the adhesion properties of adhesive formulations. the t-peel test shows that formulations with  5 wt% of c5 or c9  have the best results among other formulations with further tackifier loadings. according to the rheometry test, the melt viscosity of the mentioned formulations decreased compared to neat polyurethane. also, dsc analysis demonstrates that both formulations had a lower glass transition temperature concerning pure polyurethane. the formulation, including the c9, has a higher glass transition temperature than its counterpart, reflecting the better interaction between polyurethane and c9 than c5.