Polish version

Login form

register


Print

J. Janik, S. Lenart, W. Królikowski, P. Penczek

Polymer blends PET/PE-LD and PET/PP with a new compatibilizer (in English)

Polimery 2004, No 6, 432


DOI: dx.doi.org/10.14314/polimery.2004.432

Summary

Properties of PET blends with polyolefins with an addition of carboxylated polyethylene wax as a new compatibilizer for these systems were investigated. The effects of thes additive on static mechanical properties, thermal properties and rheological characteristics as well as on the structures of PET/PE-LD or PET/PP blends (40 wt. %/60 wt. %) were determined in comparison with similar blends with commercial compatibilizers such as Kraton (SEBS-g-MA) or Polybond (PP-g-MA). Samples of the blends varying in compositions were obtained by extrusion. Additionally, the fittings investigations suitable for of mechanical properties' were injection molded. Addition of functionalized PE wax to PET/PE-LD blends improves simultaneously all the properties investigated, i.e. flexural strength, tensile strength, elongation at break, flexural modulus, tensile modulus and impact strength. It was stated from the microscopic observations and DMTA results that the wax acts as a good compatibilizer of the blends, improving compatibility of the components. Because of its significant affinity for both PE-LD and PET, the wax forms homogeneous systems with the components. The effect of PE wax on PET/PP system is less significant and is similar to those of investigated commercial compatibilizers. These two commercial compatibilizers, acting as additives to the polymeric PET/PE-LD or PET/PP blends, usually influence advantageously the selected mechanical properties, for instance they improve an impact strength and elongation at break with simultaneous decrease in tensile modulus. Images of morphological structures showed too little affinities of these compatibilizers for PET phase (PP-g-MA and SEBS-g-MA form heterogeneous systems with PET).


Keywords: poly(ethylene terephthalate), low density polyethylene, polypropylene, polymer blends, compatibilizers, mechanical properties, rheological properties, morphological structure


J. Janik, S. Lenart, W. Królikowski, P. Penczek

Polymer blends PET/PE-LD and PET/PP with a new compatibilizer (in English)