Structural and Viscoelastic Properties of Thermoplastic Polyurethanes Containing Mixed Soft Segments with Potential Application as Pressure Sensitive Adhesives
| Autor: | José Miguel Martín-Martínez, Mónica Fuensanta |
|---|---|
| Přispěvatelé: | Universidad de Alicante. Departamento de Química Inorgánica, Adhesión y Adhesivos |
| Rok vydání: | 2021 |
| Předmět: |
Thermogravimetric analysis
Thermoplastic Materials science Polymers and Plastics Organic chemistry Thermoplastic polyurethane Miscibility Article law.invention Differential scanning calorimetry QD241-441 Rheology law structure-property relationship Viscoelastic properties Crystallization Composite material Structure-property relationship chemistry.chemical_classification Química Inorgánica viscoelastic properties General Chemistry mixed soft segments thermoplastic polyurethane chemistry Pressure sensitive adhesive pressure sensitive adhesive Adhesive Mixed soft segments |
| Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) Polymers Volume 13 Issue 18 Polymers, Vol 13, Iss 3097, p 3097 (2021) |
| Popis: | Thermoplastic polyurethanes (TPUs) were synthetized with blends of poly(propylene glycol) (PPG) and poly(1,4-butylene adipate) (PAd) polyols, diphenylmethane-4,4′-diisocyanate (MDI) and 1,4-butanediol (BD) chain extender different NCO/OH ratios were used. The structure and viscoelastic properties of the TPUs were assessed by infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, thermal gravimetric analysis and plate-plate rheology, and their pressure sensitive adhesion properties were assessed by probe tack and 180° peel tests. The incompatibility of the PPG and PAd soft segments and the segregation of the hard and soft segments determined the phase separation and the viscoelastic properties of the TPUs. On the other hand, the increase of the NCO/OH ratio improved the miscibility of the PPG and PAd soft segments and decreased the extent of phase separation. The temperatures of the cool crystallization and melting were lower and their enthalpies were higher in the TPU made with NCO/OH ratio of 1.20. The moduli of the TPUs increased by increasing the NCO/OH ratio, and the tack was higher by decreasing the NCO/OH ratio. In general, a good agreement between the predicted and experimental tack and 180° peel strength values was obtained, and the TPUs synthesized with PPG+PAd soft segments had potential application as pressure sensitive adhesives (PSAs). |
| Databáze: | OpenAIRE |
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