Reactive melt processing of poly (L-lactide) in the presence of thermoplastic polyurethane and carboxylated carbon nanotubes
| Autor: | Omid Yousefzade, Jordi Puiggalí, Jone M. Ugartemendia, Leire Sangroniz, Roberto Hernandez, Hamid Garmabi |
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| Rok vydání: | 2019 |
| Předmět: |
Thermogravimetric analysis
Nanocomposite Materials science 020502 materials Mechanical Engineering technology industry and agriculture 02 engineering and technology Carbon nanotube Dynamic mechanical analysis Viscoelasticity law.invention Thermoplastic polyurethane Reptation 0205 materials engineering Chemical engineering Mechanics of Materials law General Materials Science Polymer blend |
| Zdroj: | Journal of Materials Science. 54:14961-14974 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-019-03889-8 |
| Popis: | In this study, two types of polymeric nanocomposite blends based on poly(l-lactide) (PLLA) and a thermoplastic polyurethane were prepared by reactive and non-reactive melt mixing. Multiwalled carbon nanotubes (MWCNTs) participated in reactive melt mixing and changed in both cases the morphology of blends. Melt rheology was used to study the influence of reactive melt mixing and localization of MWCNTs in terms of melt viscoelastic properties and relaxation time spectrum. Two relaxation times were observed for both types of blends due to reptation and stress release mechanism, although blends prepared by reactive melt mixing showed another relaxation mechanism associated with the generated interphase. Solid-state viscoelasticity determined by dynamical mechanical analysis showed significant influences of both MWCNTs and reactive melt mixing on storage modulus of the blends. Thermogravimetric analysis showed several degradation steps for polymer blends that contrast with the single step determined for both pure PLLA and PLLA nanocomposites. |
| Databáze: | OpenAIRE |
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