Influence of the soft segment length on the properties of water-cured poly(carbonate-urethane-urea)s

2014 ◽  
Vol 26 (1) ◽  
pp. 57-67 ◽  
Author(s):  
Magdalena M. Mazurek ◽  
Karolina Tomczyk ◽  
Monika Auguścik ◽  
Joanna Ryszkowska ◽  
Gabriel Rokicki
Keyword(s):  
Soft Segment ◽  
Segment Length ◽  
Poly Carbonate

scholarly journals Study of waterborne polyurethane materials under aging treatments. Effect of the soft segment length

2020 ◽  
Vol 138 ◽  
pp. 105357 ◽  
Author(s):  
Anny C. Ospina ◽  
Víctor H. Orozco ◽  
Luis F. Giraldo ◽  
Mónica Fuensanta ◽  
José Miguel Martín-Martínez ◽  
...  
Keyword(s):  
Soft Segment ◽  
Waterborne Polyurethane ◽  
Segment Length

Crystallinity and morphology of segmented polyurethanes with different soft-segment length

1996 ◽  
Vol 62 (4) ◽  
pp. 631-638 ◽  
Author(s):  
Fengkui Li ◽  
Jianan Hou ◽  
Wei Zhu ◽  
Xian Zhang ◽  
Mao Xu ◽  
...  
Keyword(s):  
Soft Segment ◽  
Segment Length ◽  
Segmented Polyurethanes

scholarly journals New thermoplastic poly(carbonate-urethane) elastomers

2011 ◽  
Vol 13 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Anna Kultys ◽  
Magdalena Rogulska
Keyword(s):  
Soft Segment ◽  
Tensile Tests ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Melt Polymerization ◽  
Atomic Force ◽  
Amorphous Structures ◽  
A Chain ◽  
Poly Carbonate

New thermoplastic poly(carbonate-urethane) elastomersTwo series of novel thermoplastic poly(carbonate-urethane) elastomers, with different hard-segment content (30 - 60 wt %), were synthesized by melt polymerization from poly(hexane-1,6-diyl carbonate) diol of Mn= 2000 as a soft segment, 4,4'-diphenylmethane diisocyanate (MDI) or hexane-1,6-diyl diisocyanate (HDI) and 6,6'-[methylenebis(1,4-phenylenemethylenethio)]dihexan-1-ol as a chain extender. The structure and basic properties of the polymers were examined by Fourier transform infrared spectroscopy, X-ray diffraction analysis, atomic force microscopy, differential scanning calorimetry, thermogravimetric analysis, Shore hardness and tensile tests. The resulting TPUs were colorless polymers, showing almost amorphous structures. The MDI-based TPUs showed higher tensile strengths (up to 21.3 MPa vs. 15.8 MPa) and elongations at break (up to 550% vs. 425%), but poorer low-temperature properties than the HDI-based analogs.

Effect of the average soft-segment length on the morphology and properties of segmented polyurethane nanocomposites

2006 ◽  
Vol 102 (1) ◽  
pp. 128-139 ◽  
Author(s):  
Bradley Finnigan ◽  
Peter Halley ◽  
Kevin Jack ◽  
Alasdair McDowell ◽  
Rowan Truss ◽  
...  
Keyword(s):  
Soft Segment ◽  
Segment Length ◽  
Segmented Polyurethane ◽  
Polyurethane Nanocomposites

scholarly journals Preparation of Associative Polyurethane Thickener and Its Thickening Mechanism Research

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Gao Nan ◽  
Zhang Zhuo ◽  
Dong Qingzhi
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
Soft Segment ◽  
Synthesis Process ◽  
Segment Length ◽  
Solvent Ratio ◽  
Aqueous Dispersions ◽  
Before And After ◽  
Size And Morphology ◽  
End Capping

Associative polyurethane (PU) thickener has been synthesized by preparing the prepolymer with the reaction of polyethylene glycol (PEG) and isophorone diisocyanate (IPDI), which then end-capping with long-chain alkanol. The synthesis process, as well as hydrophilic chain length, theoretical molecular weight, solvent ratio, and thickener percentages, has been researched. The results shows that it reaches the upmost thickening effect when the theoretical molecular weight is under 20000, soft-segment length is under 4000, solvent ratio is 1 : 1, and thickener percentages are controlled at 10%. Furthermore, thickening mechanism of PU thickener has been analyzed detailedly through the measurement of the critical micelle concentration (CMC) of PU thickener and analysis of the influence of PU thickener on the particle size and morphology of PU dispersions. It has been observed from the scanning electron microscopy (SEM) that the PU aqueous dispersions produce a certain degree of flocculation when the PU thickener was added, and this flocculation structure has been proved to be a thixotropic structure through the characterization of the change of particle size before and after the thickener is introduced into the PU aqueous dispersions. The CMC measurement results present that the thickening effect will be apparent when the concentration is controlled in a low range.

Hydrolytic stability of aliphatic poly(carbonate-urea-urethane)s: Influence of hydrocarbon chain length in soft segment

2019 ◽  
Vol 161 ◽  
pp. 283-297 ◽  
Author(s):  
Magdalena Mazurek-Budzyńska ◽  
Marc Behl ◽  
Muhammad Y. Razzaq ◽  
Ulrich Nöchel ◽  
Gabriel Rokicki ◽  
...  
Keyword(s):  
Chain Length ◽  
Soft Segment ◽  
Hydrolytic Stability ◽  
Hydrocarbon Chain ◽  
Hydrocarbon Chain Length ◽  
Poly Carbonate

Tuning the properties of segmented polyurea by regulating soft-segment length

2018 ◽  
Vol 135 (21) ◽  
pp. 46284 ◽  
Author(s):  
Nahid Iqbal ◽  
Manorama Tripathi ◽  
Surekha Parthasarathy ◽  
Devendra Kumar ◽  
Prasun Kumar Roy
Keyword(s):  
Soft Segment ◽  
Segment Length

Effect of soft segment length on the properties of polyurethane anionomer dispersion

Polymer ◽  
1994 ◽  
Vol 35 (5) ◽  
pp. 1095-1099 ◽  
Author(s):  
Young Min Lee ◽  
Jong Cheol Lee ◽  
Byung Kyu Kim
Keyword(s):  
Soft Segment ◽  
Segment Length

Study of the Effect of Soft-Segment Length and Concentration on Properties of Polyetherurethanes. I. The Effect on Physical and Morphological Properties

1985 ◽  
Vol 58 (4) ◽  
pp. 685-700 ◽  
Author(s):  
Zoran S. Petrović ◽  
Jaroslava Budinski-Simendić
Keyword(s):  
Phase Inversion ◽  
Hard Segment ◽  
Soft Segment ◽  
Degree Of Polymerization ◽  
Morphological Properties ◽  
Segment Length ◽  
Hard Phase ◽  
Soft Phase ◽  
Soft Segments ◽  
Two Phases

Abstract 1. Densities of elastomers with crystallizing soft segments were higher than that of the noncrystallizing ones. However, the effect of the soft segment length is not regular and may reflect some specific interactions between two phases as well as instantaneous morphology. 2. Phase inversion as judged by drop of hardness takes place at about ssc=60° or more; a shift to higher ssc gives a greater segment length. 3. Tg of the soft segment in samples with well separated phases is independent of ssc, e.g., the presence of hard phase does not change mobility of the soft phase in samples with ssc=50° or more, in all series. However, Tg is strongly dependent on the soft-segment length. Tg for the soft segment of Mn=650 was −43°C, for Mn=1000 was −62°C, and for Mn=2000, Tg was −75°C. The effect of the presence of the hard phase on mobility of the soft phase seems to vanish for M>2500. 4. Tg of the hard segment at 77°C was clearly observed only in quenched samples with a high hard-segment concentration (80%) and at 93°C in a pure hard segment. 5. Melting of both phases were observed in polymers with long soft segments (Mn=2000). Soft segments of Mn=650 and 1000 do not crystallize. The hard phase crystallizes if its Mn is about 1000 or more or if the degree of polymerization of the hard segment is 3 or above, although exceptions were found in the A series. 6. Spherulitic structures were observed in polymers with low ssc (20% and 40%) polymers and in one with ssc=80°. Thus, both hard and soft phases can form spherulitic structures.

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