Effects of two different maleic anhydride‐modified adhesion promoters (PP‐g‐MA) on the structure and mechanical properties of nanofilled polyolefins

Abstract

The effects of adhesion promoter properties on the structure and mechanical behavior of nanoclay-filled polyolefin nanocomposites are presented. Two different maleic anhydride-modified polypropylenes having varying maleic anhydride content and molecular weight were used. The influence of these parameters on the performance and morphology of the prepared polypropylene and high density polyethylene-based nanocomposites was examined by mechanical testing, X-ray diffraction, and electron microscopy. The low molecular weight adhesion promoter seemed to be effective in both matrices in relation to mechanical property enhancements, whereas its high molecular weight counterpart performed well only in polyethylene matrix. X-ray diffraction results and examination of morphology revealed that the intercalation and the dispersion of the nanoclay were more even in both matrices when the low molecular weight adhesion promoter with a higher maleic anhydride content was used. On the other hand, the use of high molecular weight adhesion promoter led to a less uniform dispersion but also to a greater amount of exfoliated clay particles.

Effects of SiO2 and Al2O3 nanofillers on polyethylene properties

“…A good dispersion of hydrophilic nanofillers in polyethylene is difficult to be obtained because of the strong hydrophobicity of the matrix. This drawback is usually overcomed by the surface modification of nanofillers or by using adhesion‐promoting agents 10, 12, 23. The latter method is easier to apply and maleic anhydride‐modified polyolefins have proven to be effective compatibilizing agents 10, 23.…”

“…This drawback is usually overcomed by the surface modification of nanofillers or by using adhesion‐promoting agents 10, 12, 23. The latter method is easier to apply and maleic anhydride‐modified polyolefins have proven to be effective compatibilizing agents 10, 23. Some studies have emphasized the effect of interfacial interactions and nanosilica dispersion on the mechanical properties of polyolefin‐based nanocomposites prepared by melt compounding.…”

Polyethylene/sepiolite clay nanocomposites: Effect of clay content, compatibilizer polarity, and molar mass on viscoelastic and dynamic mechanical properties

“…with sample weight 5 ± 1 mg. Crystallization temperature, melting temperature as well as heat of fusion (Δ H f ) were calculated from the cooling and second heating scans respectively. Following relationship [eq. ] was used to determine percent crystallinity of the samples: where X c = percent crystallinity, Δ H f = melting enthalpy of sample, Δ H f 0 = melting enthalpy of 100% crystalline HDPE which is taken as 293 J/g from the literature and f p = weight fraction of polymer matrix in HDPE/Sepioite nanocomposites.…”

Montmorillonite as support for peroxide in the melt grafting of maleic anhydride onto polypropylene

“…Incorporating graft copolymers as compatibilizers in incompatible systems has been a widely used strategy in recent decades . Methods used for obtaining these compatibilizers include chemical modification of nonpolar polymers with vinyl monomers by reactive processing, such as the grafting of maleic anhydride (MA) onto polypropylene (PP) …”