Studies of properties of polypropylene/halloysite composites

Abstract

The results of the studies on the synthesis, mechanical and thermal properties of polypropylene composites with various amount of halloysite filler are presented. Halloysite (HNT) belongs to the silica type characterized by a two-layer 1:1 structure. This work was aimed to develop a method for the modification of halloysite in its prime use as a filler for polypropylene by extrusion. The composites contain 1, 3, 5 and 7 wt.% of HNT. The degree of crystallinity of the composites decrease with increasing halloysite content. The results confirm the expectations that composites of interesting physicochemical, mechanical and thermal properties can be obtained. The mechanical properties studied show that the filler modification method used leads to the synthesis of polymer composites of improved thermal and mechanical properties.

Development of Multiwalled Carbon Nanotubes/Halloysite Nanotubes Reinforced Thermal Responsive Shape Memory Polymer Nanocomposites for Enhanced Mechanical and Shape Recovery Characteristics in 4D Printing Applications

“…The random orientation and uniform distribution of the reinforcements in the SMPU matrix added greater strength and enhanced the binding strength of the matrix material under bending loads, which is responsible for the increase in flexural strength with an increase in reinforcement. Similar behavior was also observed in various previous studies of HNT-reinforced polypropylene [ 36 , 37 ].…”

Revolution/rotation‐type mixing‐assisted masterbatch process for polypropylene‐based high‐impact ternary nanocomposites

“…Its exchangeable ions and silanol groups on the surface make it easy for organophilic modifications to be compatible with organic polymers in nanocomposite preparation. In addition to high mechanical strength, its high flame retardancy is an advantage in the thermal stability of polymers, as frequently stated in the literature . Recently, HNT clay has been used in the preparation of PP/poly(ethylene teraphatalate) (PET) blend nanocomposites toughened with SEBS‐ g ‐MA by simultaneous melt‐mixing and two‐step methods.…”

Preparation and characterization of plasticized starch/halloysite porous nanocomposites possibly suitable for biomedical applications

“…In the case of foams, the water uptake results from two phenomena: the swelling of the bulk material and the water introduced in the cells. For non‐foamed material (the porosity of GS6% extruded at a die temperature at 110°C is very low, 4%, and this material can be considered as non‐foamed), the water content results only from the water absorption during the swelling . Figure shows that the water uptake increases with increasing die temperature.…”

“…Common halloysites used for polymer‐based nanocomposites are in form of fine, tubular structures of 300–1500 nm length, 15–100 nm inner diameter, and 40–120 nm outer diameter . Their addition in thermoplastic matrices allows enhancing the mechanical properties, thermal properties, fire performance, and the degree of crystallinity . Moreover, their tubular structure is an added advantage for drug delivery systems because they can entrap and then release active ingredient …”