Degradation of poly (ethylene-co-methacrylic acid)-calcium carbonate nanocomposites
2007 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 92, no 10, 1795-1802 p.Article in journal (Refereed) Published
Composites of poly(ethylene-co-methacrylic acid) with 5 mass fraction percent of precipitated calcium carbonate nanoparticles were prepared by melt extrusion on a miniature melt-blender and medium-scale production equipment. The composites consisted mostly of isolated particles. The ultimate mechanical properties of the nanocomposites were consequently largely superior to composites with micron-sized filler. The calcium carbonate particles were shown to offer a large surface area for calcium salt formation during the thermal degradation of the material. This imparted a stabilizing effect to the copolymer that was comparable to the neutralization of the methacrylic acid units with calcium ions. The rate of calcium salt formation was fast at temperatures above 350 degrees C. Stearic acid surface coatings did not interfere significantly with the calcium salt formation. The oxidative stability of the composites was further largely improved by the formation of a diffusion barrier.
Place, publisher, year, edition, pages
2007. Vol. 92, no 10, 1795-1802 p.
polyethylene-co-methacrylic acid), calcium carbonate, nanoparticles, degradation
IdentifiersURN: urn:nbn:se:kth:diva-14214DOI: 10.1016/j.polymdegradstab.2007.07.006ISI: 000250950300006ScopusID: 2-s2.0-34948872071OAI: oai:DiVA.org:kth-14214DiVA: diva2:331780
QC 201007262010-07-262010-07-262010-11-11Bibliographically approved