Polypropylene Blends and Composite: Processing-Morphology-Performance Relationship of Injected Pieces

Abstract

Polypropylene (PP) is a low-cost plastic commodity, which currently is in a transition zone between massive use and engineering applications due mainly to its limited mechanical properties, such as low tensile and impact resistance. That is the reason why PP is usually modified with additives and particles to improve its mechanical and thermal performance and thus meet the requirements demanded by engineering applications. Besides, PP composites are suitable materials to be processed by a simple, fast, automatic, and massive technique such as injection molding. This makes PP composites attractive for several applications. However, it is important to keep in mind that PP composites' performance depends not only on their intrinsic properties but also on processing conditions. This chapter will summarize the relationship between processing and performance of several PP composite-micro, nano, and hybrid-injected parts with the aim of generating a bridge between technologic knowledge and scientist knowledge.

Hybrid solid sensitive arrays/polypropylene composites: A study on sensing alkaline vapors

“…[6][7][8] There are some drawbacks that limit the wider use of PP, such as high flammability, low tensile strength and low impact resistance, and it is a poor barrier for O 2 gas. 9,10 One strategy for surpassing these limitations is to incorporate materials (usually fillers and minerals) into a polymeric matrix through different techniques, thus creating polymeric composites. Although a composite is commonly composed of two components, one being the additive that is combined with the polymeric matrix and is responsible for the increase in the mechanical performance, in this case, more elements can be added to promote different properties and characteristics.…”

Study of the Mechanical Properties of Polymer Composites Based on Polyolefins with the Addition of Rice Husk and Compatibilizer

“…The micrograph shows a threephase structure where "phase 1" is a reticular continuous phase and monophasic off-white color due to the presence of HDPE. The interreticular spaces contain two types of structures: "Phase 2" with a morphology of pressed carton joined to the phase 1 with an appearance of lamellae off-white color as it is describe to PP [14], and "Phase 3" with gray globular islets surrounded by phase 2 without adhesions which can be related to LDPE. SEM illustrations 1a and 2a from sample MRC-4 in Fig.…”

Composites based on polymeric blends reinforced with TiO2 modified aramid fibers

“…Therefore, PP is modified with different additives, particles, etc., to improve its mechanical, thermal performance, and so on. 35 An interesting study of direct anchoring and immobilization of NA (rare earth compound with the commercial name WBG-II which acts as a β-nucleating agent of polypropylene) on the surface of aramid fiber (AF) without any treatment was studied in order to improve compatibility with PP matrix. The results obtained showed a 22% improvement in the impact resistance of the PP/AF/NA composite compared to PP/AF, but still reduced below 5 kJ/m 2 .…”

“…Among these polymers, polypropylene (PP) is currently in transition from general applications to engineering applications due to its reduced impact, tensile strength properties, and so on. Therefore, PP is modified with different additives, particles, etc., to improve its mechanical, thermal performance, and so on 35 …”