Modification of interactions in polypropylene/lignosulfonate blends
| Autor: | Béla Pukánszky, Brúnó Bozsódi, Dávid Kun, Piroska Pataki, Károly Renner, Vivien Romhányi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Polypropylene
Materials science Mechanical Engineering Maleic anhydride Compression molding 02 engineering and technology Dynamic mechanical analysis 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Miscibility 0104 chemical sciences chemistry.chemical_compound chemistry Mechanics of Materials lcsh:TA401-492 Lignin General Materials Science Lignosulfonates lcsh:Materials of engineering and construction. Mechanics of materials Composite material 0210 nano-technology Tensile testing |
| Zdroj: | Materials & Design, Vol 103, Iss, Pp 32-39 (2016) |
| ISSN: | 0264-1275 |
| Popis: | Polypropylene (PP)/lignin blends were prepared in a wide composition range (0–70 vol%) from a PP homopolymer and two lignosulfonates of different compositions by homogenization in an internal mixer and compression molding. Thermodynamic considerations and dynamic mechanical analysis (DMTA) were used for the estimation of interactions and miscibility, while mechanical properties were characterized by tensile testing. Local deformations were followed by acoustic emission measurements, and structure was analyzed by scanning electron microscopy (SEM). The results showed that the structure of the blends form during processing by the breakup of large lignin particles which soften at the high temperature of processing. Weak interactions develop between PP and lignin, since lignin molecules interact with each other strongly and prevent the mixing of the two components. Dispersed structure forms in the entire composition range studied, co-continuous structure cannot develop at all. Interfacial adhesion can be improved through the addition of a maleic anhydride grafted polypropylene (MAPP) coupling agent. Depending on the strength of interfacial adhesion the blends fail either by debonding or by the fracture of lignin particles. Although coupling improves the strength of the blends, deformability is very small especially at larger lignin contents hindering practical application. Keywords: Lignin blends, Miscibility, Compatibility, Dispersed structure, Local deformations, Interfacial adhesion |
| Databáze: | OpenAIRE |
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