Morphology and tensile properties of model thermoplastic polyurethanes with MDI/butanediol based monodisperse hard segments

2016 ◽  
Vol 54 (24) ◽  
pp. 2485-2493 ◽  
Author(s):  
Li Ren ◽  
Priyank N. Shah ◽  
Rudolf Faust
Keyword(s):  
Tensile Properties ◽  
Thermoplastic Polyurethanes ◽  
Hard Segments ◽  
Monodisperse Hard Segments

scholarly journals Tensile properties of segmented block copolymers with monodisperse hard segments

2008 ◽  
Vol 43 (10) ◽  
pp. 3689-3696 ◽  
Author(s):  
G. J. E. Biemond ◽  
J. Feijen ◽  
R. J. Gaymans
Keyword(s):  
Block Copolymers ◽  
Tensile Properties ◽  
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

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.

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

scholarly journals Tunable Structure and Properties of Segmented Thermoplastic Polyurethanes as a Function of Flexible Segment

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1910 ◽  
Author(s):  
Manuel Asensio ◽  
Victor Costa ◽  
Andrés Nohales ◽  
Otávio Bianchi ◽  
Clara M Gómez
Keyword(s):  
Tensile Properties ◽  
Microphase Separation ◽  
Mechanical Analysis ◽  
Phase Behaviour ◽  
Scanning Calorimetry ◽  
Thermoplastic Polyurethanes ◽  
Separation Degree ◽  
Tunable Structure ◽  
Flexible Segment ◽  
The Stability

Segmented thermoplastic polyurethanes (PUs) were synthetized using macrodiols with different functional groups (carbonate, ester, and /or ether) as a segment with a molar mass of 1000 and 2000 g/mol, and 4,4’-diphenylmethane diisocyanate (MDI) and 1,4-butanediol as a rigid segment. The polyurethanes obtained reveal a wide variation of microphase separation degree that is correlated with mechanical properties and retention of tensile properties under degradation by heat, oil, weather, and water. Different techniques such as differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), Fourier transform infrared (FTIR), and synchrotron small-angle X-ray scattering (SAXS) were used to determine rigid-flexible segments’ phase behaviour. Retention of tensile properties determines the stability of the samples under different external factors. This work reveals that pure polycarbonate-based macrodiols induce the highest degree of phase miscibility, better tensile properties, hardness shore A, and retention of tensile properties under external agents.

scholarly journals A structural reconsideration: Linear aliphatic or alicyclic hard segments for biodegradable thermoplastic polyurethanes?

2018 ◽  
Vol 56 (19) ◽  
pp. 2214-2224 ◽  
Author(s):  
Konstanze Seidler ◽  
Katharina Ehrmann ◽  
Patrick Steinbauer ◽  
Andreas Rohatschek ◽  
Orestis G. Andriotis ◽  
...  
Keyword(s):  
Thermoplastic Polyurethanes ◽  
Hard Segments
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