Synthesis and thermal transition behavior of model thermoplastic polyurethanes containing MDI/butanediol-based monodisperse hard segments

2016 ◽  
Vol 54 (19) ◽  
pp. 3171-3181 ◽  
Author(s):  
Li Ren ◽  
Nam-Goo Kang ◽  
Priyank N. Shah ◽  
Rudolf Faust
Keyword(s):  
Thermal Transition ◽  
Thermoplastic Polyurethanes ◽  
Transition Behavior ◽  
Hard Segments ◽  
Monodisperse Hard Segments

The effect of separation of blocks on the crystallization kinetics and phase composition of poly(butylene adipate) in multi-block thermoplastic polyurethanes

2022 ◽  
Author(s):  
Marina A. Gorbunova ◽  
Evgenii V. Komov ◽  
Leonid Yu. Grunin ◽  
Mariya S. Ivanova ◽  
Ainur F. Abukaev ◽  
...  
Keyword(s):  
Phase Composition ◽  
Phase Separation ◽  
Crystallization Kinetics ◽  
Separation Process ◽  
Degree Of Crystallinity ◽  
Thermoplastic Polyurethanes ◽  
Phase Separation Process ◽  
Hard Segments ◽  
Final Degree

Control of the phase separation process of soft and hard segments by selecting diisocyanates and by varying the thermal program allows defining the final degree of crystallinity and phase composition of TPUs.

scholarly journals Thermoplastic polyurethanes with controlled morphology based on methylenediphenyldiisocyanate/isosorbide/butanediol hard segments

2015 ◽  
Vol 64 (11) ◽  
pp. 1607-1616 ◽  
Author(s):  
Ivan Javni ◽  
Olivera Bilić ◽  
Nikola Bilić ◽  
Zoran S Petrović ◽  
Eric A Eastwood ◽  
...  
Keyword(s):  
Thermoplastic Polyurethanes ◽  
Controlled Morphology ◽  
Hard Segments

The curing and thermal transition behavior of epoxy resin: a molecular simulation and experimental study

RSC Advances ◽  
2013 ◽  
Vol 3 (20) ◽  
pp. 7452 ◽  
Author(s):  
Qing Yang ◽  
XiaoPing Yang ◽  
XiuDi Li ◽  
Lei Shi ◽  
Gang Sui
Keyword(s):  
Experimental Study ◽  
Epoxy Resin ◽  
Molecular Simulation ◽  
Thermal Transition ◽  
Transition Behavior

Influence of hard segments content on thermal, morphological and mechanical properties of homo and co-polyurethanes: a comparative study

2021 ◽  
Vol 1 (109) ◽  
pp. 5-16
Author(s):  
Z.K. Alobad ◽  
M. Albozahid ◽  
H.Z. Naji ◽  
H.S. Alraheem ◽  
A. Saiani
Keyword(s):  
Mechanical Properties ◽  
Ethylene Glycol ◽  
Exothermic Peak ◽  
Thermoplastic Polyurethanes ◽  
Main Challenge ◽  
New Type ◽  
Hard Segments ◽  
Poly Ethylene ◽  
Poly Propylene ◽  
Hydrogen Bonded

Purpose: This work aims to study the effect of hard segments (HS) content on the thermal, morphological and mechanical properties of polyurethane polymers based on 1.5 pentanediol chain extenders. Design/methodology/approach: Two comparable series of polyurethanes were synthesised including homo-polyurethane (Homo-PU) and copolyurethane (Co-PU). The Homo-PU consists of 100% wt. of hard segments (HS). The Co-PU composes of 30%wt. of soft segments (SS) using a poly(ethylene glycol)-block-poly(propylene glycol)-blockpoly( ethylene glycol) material. The effect of hard segments content on the morphology of Homo-PU and Co-PU was also studied. Findings: The Homo-PU and Co-PU materials show three distinct degradation steps with the higher thermal stability of the Co-PU compared to the Homo-PU. Enthalpy of fusion (ΔHM) and heat capacity (ΔCP) of polyurethane (PU) samples decrease with decreasing HS content. In the cooling cycle, the higher exothermic peak of crystallization is observed in the Co-PU. In contrast, the cold crystalline peak is observed in the 2nd heating cycle of the Homo-PU. Melting temperature (TM) increases with increasing SS content. Glass transition temperature (Tg) of PU samples shifts to higher temperature with increasing HS content. Storage modulus (E’) of the Co-PU is higher than E’ of the Homo-PU. All N-H groups in PU samples are hydrogen-bonded, whilst most of the C=O groups are hydrogen-bonded. The degree of hydrogen bonding in PU samples decreases with decreasing HS content. The Homo-PU shows better hardness than the Co-PU and higher brittleness at low temperature. WAXS results of the Homo-PU display better crystallinity compared to the Co-PU. Research limitations/implications: The main challenge in this work was how to synthesis Thermoplastic polyurethanes (TPUs) with specific properties to compete other common polymer such as Polyamides (PA) and Polypropylene (PP).Practical implications: Thermoplastic polyurethanes (TPUs) can be used in various application such as backageing, foot,automobiles and constructions. Originality/value: A new type of TPUs that synthesized using different type of chain extender (1.5 pentanediol). Two different types of TPUs were synthesized one contained 30% SS and 70% HS and a second one contained 100% HS.

Thermal transition behavior of polybutadiene containing polyurethanes

1979 ◽  
Vol 19 (15) ◽  
pp. 1122-1128 ◽  
Author(s):  
N. S. Schneider ◽  
R. W. Matton
Keyword(s):  
Thermal Transition ◽  
Transition Behavior

Time-Dependent Morphology Development in a Segmented Polyurethane with Monodisperse Hard Segments Based on 1,4-Phenylene Diisocyanate

2005 ◽  
Vol 38 (24) ◽  
pp. 10074-10079 ◽  
Author(s):  
Jignesh P. Sheth ◽  
Derek B. Klinedinst ◽  
Todd W. Pechar ◽  
Garth L. Wilkes ◽  
Emel Yilgor ◽  
...  
Keyword(s):  
Time Dependent ◽  
Segmented Polyurethane ◽  
Hard Segments ◽  
Morphology Development ◽  
Monodisperse Hard Segments

Thermal transition behaviors, solubility, and mechanical properties of wholly aromatic para-, meta-poly(ether-amide)s: effect on numbers of para-aryl ether linkages

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 84284-84293 ◽  
Author(s):  
Wen-Qiang Zhang ◽  
Xiu-Li Wang ◽  
Gui-Cheng Liu ◽  
Li Chen ◽  
Yu-Zhong Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Transition ◽  
Aryl Ether ◽  
Transition Behavior

para- and meta-poly(ether-amide)s containing 2, 3, 4 or 5 para-aryl ether linkages show different solubility, thermal transition behavior and mechanical properties.

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