The mechanical properties of unidirectional all-polypropylene composites

Fabrication and mechanical properties of self-reinforced poly(ethylene terephthalate) composites

“…An increase in the holding time did not cause any large changes in the tensile properties, whereas the impact energy slightly improved. However, Alcock et al [12] reported that the unidirectional self-reinforced PP composites prepared by co-extruded technique showed little deviation in the mechanical properties from temperature consolidation. Khondker et al [25] studied the mechanical properties of aramid/ nylon plain knitted composites fabricated by varying the holding time.…”

“…Ward and coworkers [7][8][9][10][11] further developed this type of composite material using the 'hot compaction' technique. Following this study, opening literatures has reported numerous studies on the preparation of self-reinforced polypropylene (PP) [8,[11][12][13][14][15][16][17], polyethylene terephthalate (PET) [4,9,[18][19], polymethyl methacrylate [20], liquid crystal copolymer [21][22], polylactic acid [23], and poly amide [24][25][26] composites. In particular, the self-reinforced PP composites are now available on the market under the trade name Curv ® , Armordon ® , and Pure ® [5].…”

“…However, the processing window of hot compaction is small, typically about 5°C or below between the feasible consolidation temperature and the melting temperature of the fiber. In 2006, Alcock et al [17] improved the hot compaction process using a combination of constraining and co-extrusion. The processing window for creating these self-reinforced PP composites can be enlarged to approximately 20-40°C creating excellent bonding between the co-extruded two types of PP tapes of different melting temperatures.…”

Prediction of yield and long‐term failure of oriented polypropylene: Kinetics and anisotropy

“…During solid state processing, molecular chains are often preferentially oriented along a specific direction, for example, the drawing direction, so that the final products possess the desired properties in a particular direction. [1][2][3][4] As a result, the yielding and failure behavior of these polymers are anisotropic and therefore yield criteria should be adapted to account for this.…”

Non-destructive characterisation of all-polypropylene composites using small angle X-ray scattering and polarized Raman spectroscopy

“…In case of allpoly(ethylene terephthalate) (all-PET) composites increased processing temperature and holding time have found to cause hydrolytic degradation, embrittlement and noticeable deterioration of the mechanical properties of the polyester components [9,10]. The effect of processing parameters on the mechanical properties was first presented by Ward and Hine for polyethylene (PE) based composites [11] and by Alcock et al for all-polypropylene composites (all-PPCs) [12,13]. These investigations show that the consolidation quality of all-PPCs improves as a function of increasing processing temperature, as also revealed by tensile, flexural and peel strength, modulus and density measurements by Izer et al [14].…”