Effect of nanoparticles on the morphology and properties of PET/PP in situ microfibrillar reinforced composites

Abstract

In this work, the effect of SiO2 nanoparticles on the morphology and properties of PET/PP in situ microfibrillar reinforced composites (MFC) obtained from slit die extrusion and hot stretching‐quenching was investigated. The scanning electron micrographs revealed that the nanoparticles could have different effects on microfibril formation of PET/PP MFC depending on their concentration. Addition of appropriate content of nanoparticles (e.g., 1.6 and 8 wt%) facilitated the PET droplet‐fibril transition during stretching due to the presence of nanosilica in the PP matrix, which increased the viscosity of PP matrix and then improved the droplet deformability. However, at higher loading (e.g., 12 wt%), the aggregation of silica nanoparticles around the PET droplets prevented disperse phase coalescence during drawing and then reduced the fibrillation ability of PET minor phase. The dynamic rheological test performed at 190°C showed that the increased spatial restriction of the nanoparticles improved the viscoelastic moduli and complex viscosity of PET/PP MFC. DSC results indicated that nanosilica had little heterogeneous nucleation effect on the PP matrix of PET/PP MFC. Additionally, nanoparticles could present drastic improvement in the degradation behavior of PET/PP MFC under thermo‐oxidative conditions and increased the modulus of PET/PP MFC. POLYM. COMPOS., 38:2718–2726, 2017. © 2015 Society of Plastics Engineers

Phase Behavior and Thermo-Mechanical Properties of IF-WS2 Reinforced PP–PET Blend-Based Nanocomposites

“…Since melting temperature of PP and glass transition temperature of PET comes near each other at around 80 °C, this region is analyzed for thermal characterization of fabricated systems. Similarly, merging of melting temperature and glass transition temperature of two different polymer has also been previously reported [ 7 ]. In the present case there is no peak in DSC thermogram instead of melting region 145–155 °C.…”

“…Recently, PP has been blended with some high-melting-point polymers such as PET, Nylon, Ethylene Vinyl Acetate Copolymer (EVA), etc. using different kinds of nanofillers as discussed elsewhere to increase miscibility and to minimize phase separation [ 7 , 8 ]. The main nanofillers presently used to reinforce the properties of blend nanocomposites are graphene, graphene oxide, and single/few-layer Boron Nitride (BN) [ 9 , 10 ].…”

Relationship between the Processing, Structure, and Properties of Microfibrillar Composites

“…Recently, Liu and co‐workers [ 211 ] have prepared MFCs with silica nanoparticles via hot stretching and achieved very interesting results. The elasticity of the blend was enhanced by incorporating the nanoparticles during the melt mixing, making it easier for the PET to deform.…”

Morphology and crystallization behavior of PCL/SAN blends containing nanosilica with different surface properties

“…[8][9][10][11][12][13][14] That can be attributed to the following aspects. [8][9][10][11][12][13][14] That can be attributed to the following aspects.…”

“…[8][9][10][11][12][13][14] That can be attributed to the following aspects. 10,14 On the other hand, the introduction of nanoparticles into blends as compatibilizers to control the morphology structure of blends has also been widely reported. Mdletshe et al 12 found that adding silicon carbide nanoparticles into PCL would increase cooling crystallization temperature (T c ), implying that nanoparticles have nucleating effects.…”