Bonding properties and crystallization kinetics of thermoplastic polyurethane adhesive

Materia

Preuss, Núbia Liziani¹  Bockorny, Geovana de Avila²  Gomes, Carmem Rosane Isse³ 

[1] Artecola Indústrias Químicas Ltda, Campo Bom, Brazil;Federal University of Rio Grande do Sul, Porto Alegre, Brazil;SENAI Institute for Innovation in Polymer Engineering, São Leopoldo, Brazil

关键词: TPU;    polyurethan;    polycarbodiimide;    adhesive;    crystallinity.;   

DOI  :  10.1590/s1517-707620180004.0581

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The advantages of heterophasic thermoplastic polyurethanes (TPUs), such as their phase behavior and mechanical properties, make these materials an important class of adhesives. Whereas the amorphous phase contributes to good adhesion properties, the crystalline phase is responsible for the cohesive force of TPU adhesives. This work investigates the performance of a polyester based TPU and its potential for being applied as adhesive in the shoe industry. The TPU was formulated with three different additives. The crystallization kinetics of the TPU was evaluated by Differential Scanning Calorimetry and the Avrami equation was used to assess the influence of the additives on the geometry of crystal growth and nucleation conditions. It was found that the additives had no effect on the nucleation process, whereas the polymer chains had reduced mobility, mainly in the TPU comprising polyisocyanate ε-caprolactam. The best T-peel strength on a poly(vinyl chloride) (PVC) substrate was determined for the TPU with polycarbodiimide, which improved the adhesive bonding from 3.23 N/mm to 3.32 N/mm.

【 授权许可】

CC BY