Mechanical properties of polypropylene (PP) + high‐density polyethylene (HDPE) binary blends: Non‐isothermal degradation kinetics of PP + HDPE (80/20) Blends

Abstract

aIn this study, the mechanical properties and non-isothermal degradation kinetics of polypropylene (PP), high-density polyethylene (HDPE) with dilauroyl peroxide and their blends in different mixture ratios were investigated. The effects of adding dilauroyl peroxide (0-0.20 wt%) on the mechanical and thermal properties of PP + HDPE blends have been studied. On the other hand, the kinetics of the thermal degradation and thermal oxidative degradation of PP + HDPE (80/20 wt%) blends were studied in different atmospheres, to analyze their thermal stability. The kinetic and thermodynamic parameters such as the activation energy, E a , the pre-exponential factor, A, the reaction order, n, the entropy change, the enthalpy change, and the free energies of activated complex related to PP, HDPE, and blend systems were calculated by means of the several methods on the basis of the single heating rate. A computer program was developed for automatically processing the data to estimate the reaction parameters by using different models. Most appropriate method was determined for each decomposition step according to the least-squares linear regression.

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

“…Endothermic melting point peaks in heating curves and crystallization peaks in cooling curves were clearly observed in Figure 5 Melting points of the matrices are also close and changes between 160 to 162 o C. There is not much change in melting and crystallization temperatures by DLP addition and they are similar to the results gathered in our previous study. 26 The melting and crystallization energies of PP4 matrices are dominant when compared to other matrices for all three PP types. The energy for melting initially increases by DLP addition but then decreases in higher ratios.…”

“…Between 0.01 to 0.1 wt% of DLP it has a positive effect on the PP samples, but over 0.1 wt% of DLP the mechanical values start to decrease. 26 · The best DLP ratio was between 0.04 wt% and it was changed inverse proportionally with MA of PP. The major change is observed in samples of bPP.…”

Thermal and mechanical properties of LDPE by the effects of organic peroxides

“…Table summarizes that the melt flow rates of the matrices vary by increasing amount of peroxide. Even a small amount of organic peroxide causes cross‐linking in the structure of LDPE types having different molecular weight distributions …”

Plastik Parçaların Montajında Kullanılan Geçmeli Bağlantılar İçin Takma Çıkarma Yüklerinin İki Boyutlu Sonlu Elemanlar Analizleri Yardımıyla Belirlenmesi

“…Yorulmaya karşı çok dirençlidir, düşük maliyet sebebiyle de ticari kullanım alanı oldukça yaygındır. Darbe sönümü yüksektir, aynı zamanda çok iyi elektrik yalıtımı sağlamaktadır [6,11,12].…”