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- W2361894026 abstract "Under the action of catalyst and cosolvent,a series of hydroxyl-terminated polydimethylsiloxane(PDMS) based polyurethane(PU) micro emulsion were successfully prepared by surfactant-free copolymerization.They were prepared by reacting isophorone diisocyanate(IPDI),poly(tetramethylene glycol)(PTMG) and polydimethylsiloxane(PDMS) with N-methyldiethanolamine(MDEA) as chain extender and trimethylolpropane(TMP) as crosslinker.After neutralization with dimethyl sulfate and inverse emulsion polymerization with deionized water,a series of micro emulsions were obtained.The emulsions were then cast into membranes named as PDMS/PU.Tests of mechanical properties and water absorption of PU-PDMS were carried out,and the effects of the content of hard segment,solvent,TMP,MDEA,PDMS and the molecular weight of soft segment on the properties were investigated.It is noticed that these properties are enhanced in the PDMS/PU membranes compared with pure PU,which confirm that PU is de-blocked and end-capped with PDMS.When n(NCO)/n(OH)=2.2,M_n(PTMG)=1 000,w(TMP)=3%,w(MDEA)=40%,w(PDMS)=15%,the adhesive force grade and flexility of the membranes could reach the 1st level,glossiness 101%,hardness over H,resistance to shock 50 cm and tensile strength 33.8 MPa.It is also noticed that the water absorption decreases from 11.2% to 0.12% with the increase of w(PDMS)." @default.
- W2361894026 created "2016-06-24" @default.
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- W2361894026 date "2005-01-01" @default.
- W2361894026 modified "2023-09-23" @default.
- W2361894026 title "Structure and Properties of Cationic Polyurethane/Polydimethylsiloxane Surfactant-free Micro Emulsion Membranes" @default.
- W2361894026 hasPublicationYear "2005" @default.
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