Study on waterborne polyurethanes based on poly(dimethyl siloxane) and perfluorinated polyether

Abstract

Methylsiloxane and fluorinated segments were introduced into the polymer backbone of polyurethane by direct reaction of isocyanate with dialcohol terminated perfluoropolyether (E10-H) and poly(dimethyl siloxane) (PDMS). The polyurethane structure was revealed by Fourier transform infrared spectrometer in ATR mode and Xray photoelectron spectroscope. It was found that the silicon and fluorine moieties easily migrated to the surface of material in film-forming process due to their lower energy, so the water contact angle on membrane surface was greatly enhanced (maximum 100.1º), and the hydrophobic property of material was improved. Different degree of phase separation was observed by scanning electron microscope. Increment of PDMS or E10-H content caused the phase separation obviously, but section of PDMS and E10-H modified polyurethane showed that phase separation reduced. The linear dynamic viscoelastic measurements indicated that the dynamic storage modulus of all samples increased with the increment of frequency, and PDMS modified WPU's grew fastest. The slope of G' vs. G'' showed a decrement, so each sample had a shear thinning behavior. The perfluoropolyether oil was to reduce viscosity of the system.

Property Changes of the Waterborne Polyurethane Films Synthesized from Polytetramethylene Ether Glycol and Polycarbonate Diol Due to Hydrolysis

“…1,2 이를 줄이거나 없애기 위한 방법으로 수분산 폴 리우레탄(waterborne polyurethane, WPU)을 사용하는 방법이 있다. [3][4][5][6] WPU는 기존 PU 수지와 달리 유기용제를 사용하지 않기 때문에 제조공정 중 용매 제거 공정이 생략되어 경제적 일 뿐만 아니라 VOCs가 발생하지 않아 환경 친화적인 재료 이다. [7][8][9] WPU는 Figure 6에 나타내었다.…”

Polyurethane cationomers containing fluorinated soft segments with hydrophobic properties

“…Coatings and films based on polyurethanes modified with fluorinated compounds are currently subject of wide interest due to their hydrophobic character and unique properties [1][2][3][4][5]. Recently, research attention was dedicated to fluorinecontaining waterborne polyurethanes for ecological varnishes [6][7][8][9][10][11].…”

A New Strategy for the Synthesis of Fluorinated Polyurethane

“…Fluorocarbon chains or groups have been incorporated into polyurethanes by fluorinated chain extenders, [17,18,19,20,21] diisocyanates, [22] glycols, [23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41] side groups/chains [42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58], and end-cappers [59,60,61,62,63,64,65,66]. In 2005, for the first time, a novel fluorinated polyurethane based on polyurethane macromonomers partly acrylate-endcapped with hexafluorobutyl acrylate was synthesized through macromonomer radical copolymerization [17].…”