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PU/PDMS

Recently, PU/PDMS hybrid materials (with different PDMS content) were synthesized by a two-step addition reaction.29 Thermogravimetric analysis indicated that no enhancement in the thermal... [Pg.188]

The thermal stability of PU is generally controlled by the thermally weakest link the urethane bond. In the case of PU/PDMS hybrid system, any decrease in the thermal stability might be explained by thermal instabilities in PDMS structure. [Pg.189]

It should be noted that this type of blend (PU/PDMS) presents an improved chemical resistance [6] that makes them more base-resistant than acid-resistant. In addition, the relative viscosity % (or X) which is defined as the ratio of the dispersed phase viscosity (%) to the matrix viscosity ( m) plays an important role in the quality of the blend morphology formation. An empirical relationship [7] links the capillary number (Ca) to the viscosity ratio (Eq. 1). [Pg.115]

Scheme 1 Fragmentation mechanism of the PU-PDMS copolymer in the form of a thick film... Scheme 1 Fragmentation mechanism of the PU-PDMS copolymer in the form of a thick film...
By comparing the low-mass (m/z = 0-300) spectra from the submonolaye m/z PDMS prepolymer film on Ag and the thick PU-PDMS copolymer film on Al, it was noted that the PDMS segment compositionally dominated the surface of the thick PU-PDMS film. This observation agrees well with earlier electron spectroscopy for chemical analysis (ESCA) results. [Pg.200]

Figure 5.18 ToF-SIMS spectra from polyurethane (PU)-PDMS film in range m/z (a) of 0-300 amu, (b) of 1000-2500 amu (c) of 600-2000 amu (PDMS oligomer + Ag ). Reproduced with permission from H. Zhuang, J.A. Gardella, Jr., and D.M. Hercules, Macromolecules, 1997, 30, 4, 1153. 1997, ACS... Figure 5.18 ToF-SIMS spectra from polyurethane (PU)-PDMS film in range m/z (a) of 0-300 amu, (b) of 1000-2500 amu (c) of 600-2000 amu (PDMS oligomer + Ag ). Reproduced with permission from H. Zhuang, J.A. Gardella, Jr., and D.M. Hercules, Macromolecules, 1997, 30, 4, 1153. 1997, ACS...
PU PDMS 2,4-TDI-castor oil PU prepolymer mixed with polydimethyMoxane PU crosslinked with glycerol PDMS crosslinked with methyl triace-toxysilane phase separated 196... [Pg.86]

PUs were synthesized from MDI and butanediol (EDO) as the hard segment (40 wt %) and three differerrt soft segmerrt cherrristries PDMS and PHMO (80 20 (w/w)), PC arrd PTMO. They are designated as PU-PDMS, PU-PC and PU-PTMO and the preparation has been reported elsewhere [11]. [Pg.809]

Figure 1. C=0 stretching region of the FT-IR spectra of the copolymers PU-PC (black), PU-PTMO (red), PU-PDMS (green)... [Pg.812]

Figure 3. Background corrected SAXS intensities as a function of the scattering vector of (A) PU-PDMS ( ) PU-PTMO ( ) PU-PC. [Pg.813]

See other pages where PU/PDMS is mentioned: [Pg.260]    [Pg.260]    [Pg.189]    [Pg.139]    [Pg.139]    [Pg.2679]    [Pg.199]    [Pg.200]    [Pg.200]    [Pg.200]    [Pg.201]    [Pg.202]    [Pg.698]    [Pg.442]    [Pg.455]    [Pg.140]    [Pg.140]    [Pg.809]    [Pg.810]    [Pg.810]    [Pg.810]    [Pg.812]   
See also in sourсe #XX -- [ Pg.115 ]



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