Influence of Dilauroyl Peroxide on Mechanical and Thermal Properties of Different Polypropylene Matrices

Abstract

In this study, the influence of dilauroyl peroxide on mechanical and thermal properties of different polypropylene (PP) matrices was investigated. Polypropylene matrices, different molecular weight isotactic PP containing 0.01, 0.02, 0.04, 0.06, 0.08, and 0.1 wt% of dilauroyl peroxide (DLP) were prepared by using a single-screw extruder. The effect of the visbreaking agent (DLP) on mechanical, physical, thermal and morphological properties of different molecular weight PP had been studied. Mechanical properties (tensile strength at break point, at yield and elongation at break point), melt flow index (MFI), scanning electron microscope (SEM) and differential scanning calorimetric (DSC) analyses of these matrices were examined. Melting (T m ) and crystallization (T c ) temperatures, crystallinity ratio (%) and enthalpies were determined. The microstructure of isotactic polypropylene matrix was investigated by scanning electron microscopy (SEM). From SEM analysis, it was observed that the surface disorder increased by the increasing amount of DLP. As a result of DSC analyses, the crystallinity ratio of the PP matrices has varied between 1.64-7.27%. Mechanical properties of the matrices have been improved. Particularly, the mechanical tests of PP have given interesting results when compounded with 0.06-0.08 wt% dilauroyl peroxide (DLP). Mechanical properties and thermal decomposition processes were all changed by increasing the amount of DLP in the matrix structure.

Upcycling of polypropylene with various concentrations of peroxydicarbonate and dilauroyl peroxide and two processing steps

“…This peroxide acts as initiator and co‐agent at the same time and enables a successful branching reaction. A study of PODICs with long aliphatic side chains and their high branching efficiency was presented by Gotsis et al 31 However, in the last years different approaches were followed, in which various peroxides and their influences on property changes of PP were investigated 36–43 . The melting behavior and the associated changes of the molecular structure, especially molar mass (MW) and molar mass distribution (MMD), of PP were mainly carried out.…”

Polipropilen Blendlerinin Non-İzotermal Bozunma Kinetiği

“…Bu kapsamda son zamanlarda poliolefinler üzerinde istenilen özelliklerin elde edilmesi amacıyla pek çok çalışma yapılmıştır. Şirin ve ark çeşitli çalışmalarında eriyik halde farklı tip poliolefin malzemeler (HYPE-PP) içerisine CaCO3 dolgu maddesini ilave ederek kullanılan poliolefinlerin fiziko-mekanik özelliklerini iyileştirmeyi ve termal stabilitelerini artırmayı amaçlamışlardır [1][2][3][4]. Bir başka çalışmada Zsoldos ve Kollárpolyolefin/polimetilmetakrilat blendlerinin yapısal özelliklerini ve ısısal stabilitelerini araştırmışlardır [5].…”