Continuous extrusion of high-modulus semicrystalline polymers

Abstract

SynopsisA process has been developed by which very high-modulus semicrystalline polymer films can be extruded continuously from a melt. This is accomplished by controlled cooling of the melt in a two-stage flow channel. A temperature gradient along the flow channel quenches the melt prior to an area reduction in which the polymer undergoes solid-state orientation. Analysis of high-density polyethylene tapes extruded by this process shows that they have properties similar to samples hydrostatically extruded a t 120°C. Infrared analysis was used to determine both the degree of crystallinity and degree of orientation in these tapes as well as previously prepared hydrostatically extruded samples.

Different Types of Extruders

“…The fluid can be supplied to the extrusion device by high-pressure tubes. [50][51][52][53][54][55][56][57][58][59][60][61][62][63][64], University of Leeds, England [65][66][67][68][69][70][71][72], Fyushu University, Fukuoka, Japan [73][74][75][76], Research Institute for Polymers and Textiles, Yokohama, Japan [77][78][79], Battelle, Columbus, Ohio [80][81][82][83], and Rutgers University, New Brunswick, New Jersey [84][85][86]. As mentioned earlier, publications from other sources are considerably less plentiful [87][88][89][90].…”

Morphology characterization and the phase separation behavior of UHMWPE/recycled‐PA6 blends using FTIR imaging and thermomechanical analysis

“…With the rapid development of modern industry and technology, high‐performance polymer materials have become indispensable in the survival and development of mankind. UHMWPE has a viscosity average molecular weight ranging from 1.5 to 8 million, a dense crystal structure, and excellent chemical inertness . Therefore, the chemical stability of UHMWPE is not affected much by strong acids, base solutions as well as organic solvents.…”

“…Besides, UHMWPE possesses the excellent properties of low water absorption, excellent resistance to low temperature, aging, wear and fatigue, and high cut resistance . Therefore, UHMWPE has been widely used in various fields such as textile, paper, machinery, and mining . However, its low hardness and Young's modulus, low creep resistance and difficulty in melt extrusion have prevented UHMWPE for wide‐spread applications.…”

Enhanced Thermal Performance and Impact Strength of UHMWPE/Recycled-PA6 Blends Synthesized via a Melting Extrusion Route

“…The impact strength of UHMWPE can reach >1070 J/m of the notch and the wear resistance was reported to be ∼0.25% of wear rate per cycle. Therefore, UHMWPE has been widely used in various fields such as textile, paper, machinery, and mining [1][2][3][4]. In particular, because of their low friction coefficient, high wear, and corrosion resistances, UHMWPElined pipes are widely used in oilfields to extend the wax cleaning cycle of oilfield and reduce the swabbing loads as well as the energy consumption during the manufacturing processes of oilfields.…”