Properties of PP/MWCNT-COOH /PP composites made by melt mixing versus solution cast /melt mixing methods

• Published in: IOP conference series. Materials Science and Engineering 2015-01, Vol.77 (1), p.12013
• Main Authors: Reinholds, I, Roja, Z, Zicans, J, Meri, R Merijs, Bitenieks, J
• Format: Article
• Language: English
• Subjects: Carboxylic acids; Composite materials; Crystallites; Crystallization; Differential scanning calorimetry; Elongation; Fillers; Glass transition temperature; Mechanical analysis; Mechanical properties; Melts; Modulus of elasticity; Multi wall carbon nanotubes; Nanostructure; Polymer matrix composites; Polypropylenes; Storage modulus; Tensile strength; Tensile tests; Thermal stability; Thermoplastic resins
• ISSN: 1757-899X; 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/77/1/012013

An approach on improvement of the properties of polypropylene / carbon nanotube (PP/CNT) composites is reported. PP blend compositions with carboxylic acid functionalized multi-walled carbon nanotubes (MWCNT-COOH) at filler content 1.0 wt.% were researched. One part of the composites was manufactured by direct thermoplastic mixing PP with the filler, but the other one was made from solution casted masterbatch with the following thermoplastic mixing. An increase of mechanical properties (Young's modulus, storage modulus and tensile strength), compared to an increase of glass transition temperature indicated a reinforcement effect of CNTs on PP matrix, determined from the tensile tests and differential mechanical analysis (DMA), while the elongation was reduced, compared to PP matrix. By differential scanning calorimetry (DSC) analysis, the effect of nanofiller on the reorganization of PP crystallites was observed. A noticeable enhanced effect on increase of the crystallization temperature was indicated for masterbatch manufactured composite. An increase of thermal stability was also observed, compared to pristine PP and the composite made by direct thermoplastic mixing PP with the filler.