Polymeric Fluorocarbon-Coated Polyester Substrates for Waterproof Breathable Fabrics

Abstract

Fluorocarbon (FC) coatings are applied to poly(ethylene terephthalate) (PET) fabrics by ion beam sputtering of polytetrafluoroethylene (PTFE) under different conditions. The range of the adhesion work of the coated fabrics is 5-75 10-3N.M-1 . After a washing and wearing test, most of the original coating grains remain on the fabrics, exhibiting good hydrophobicity. From XPS and ATR-FTIR analysis and property experiments, the adhesion work decreases with increasing energy due to increased fluorine content in the coatings, while it basically increases with increasing pore diameter and porosity of the specimens, probably due to the decrease in the real water-coating contact areas and roughness. For most of the just-coated specimens, no yellowing is observed due to high fluorine content. The coated fabric generally exhibits the original moisture permeability of the uncoated fabric because the PC coating covers only the fiber surfaces and most of the original pores in the fabrics remain.

Comparative Enactment of Fluorocarbon-free and Fluorocarbon-based Water Repellent Finishes on Cotton Single Jersey Fabrics

“…The resulting polar and non-polar sandwich arrangements are highly ordered, causing better repellency effects, with lower amounts of fluorocarbon compared to dendrimer-free FC finishes. Alkyl urethane structure (Schindler WD 2004) In the literature, a considerable number of studies on different water repellent chemicals, their application procedure, methods for improving the durability and their wash fastness and curing temperature have been reported (Sahin B 1996, Corpat J M 1997, Grottenmuller R 1998, Hangjin Q 2002. There are almost insufficient work on the performance of water repellent finish and their effects on knit single jersey fabrics.…”

Contract as Transfer of Ownership, Even Without Consideration

“…It would be wrong to suggest that the trend that I have identified in New Zealand and Canada is advancing in a similar manner across the entire common law world. In Ma Hongjin v SCP Holdings Pte Ltd, 102 the Singapore Court of Appeal declined to follow the lead of courts from New Zealand and Canada, holding that fresh consideration is still required to modify a contract. 103 But the cases that I have discussed suggest that, at the very least, the existence of the consideration requirement in its traditional form is questionable in the context of contract modifications.…”

Controlling the wettability properties of polyester fibers using grafted functional nanomaterials

“…Since PET fibers are generally hydrophobic and present an inherent low reactivity toward chemicals, somewhat complicated physico-chemical and chemical processes have been investigated and adopted for the surface modification of these fibers. These processes include co-spinning, 9 non-covalent physical coating, 10 plasma discharge, 11,12 alkaline treatment for partial surface ester hydrolysis, [13][14][15] partial aminolysis of surface ester groups, 16,17 glycolysis, 18 and graft polymerization. 19 Recently, extensive research has been conducted to realize superhydrophobic [20][21][22][23][24] and superhydrophilic 25,26 solid surfaces by regulating both surface roughness and surface energy.…”