Structure and Properties of Aliphatic Poly(carbonate) glycols with Different Methylene Unit Length

Masubuchi, Tetsuo; Sakai, Machiko; Kojio, Ken; Furukawa, Mutsuhisa; Aoyagi, Takeshi

doi:10.2324/ejsm.3.55

Cited by 20 publications

(35 citation statements)

References 10 publications

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“…In calorimetric measurements (DSC) no T g of OCDs could be recorded. A similar behavior of carbonate oligomers with long hydrocarbon chains (above eight methylene groups) was already reported and explained by a very fast crystallization process . Furthermore, with increasing number of methylene groups between the carbonate linkages, T m increased from 53 to 69 °C in case of OCD‐9_3000 and OCD‐12_3500, respectively.…”

Section: Resultsmentioning

confidence: 99%

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

Mazurek-Budzyńska

Razzaq

Tomczyk

et al. 2016

Polymers for Advanced Techs

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A challenge in the design of shape‐memory polymers (SMPs) is to achieve high deformability with a simultaneous high shape recovery ratio. Here we explored, whether SMPs featuring large deformation capability and high shape recovery ratios can be created as polymer networks providing two kinds of netpoints based on covalent bonds and physical interactions. As a model system, we selected poly(carbonate‐urea‐urethane)s (PCUUs) synthesized by a precursor route, based on oligo(alkylene carbonate) diols, isophorone diisocyanate (IPDI), and water vapor. The PCUU networks exhibited a one‐way shape‐memory effect (1W‐SME) with programmed strains up to εprog = 1000% whereby they provided excellent shape fixity (92–97%) and shape recovery (≥99%) ratios. The switching temperatures (Tsw) varied between 36 and 65 °C and increased with the increasing molecular weight of the oligo(alkylene carbonate) diol and length of the hydrocarbon chain between the carbonate linkages. Tsw was also influenced by the strain applied during programming (εprog). Poly(carbonate‐urethane)s have been reported to have good biocompatibility and biostability, which in the combination of high‐strain capacity and high Young's modulus makes the obtained PCUUs interesting candidate materials suitable for medical devices such as medical sutures or vascular stents. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

Mazurek-Budzyńska

Razzaq

Tomczyk

et al. 2016

Polymers for Advanced Techs

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“…Finally, the polyurethane molecules microphase-separate at a nanometer scale [ 1 , 2 , 3 , 4 ]. Both the microphase-separated structure and mechanical properties of the PUEs are influenced by a chemical structure and weight fraction of both components, a molecular weight, polydispersity of the soft segment component, thermal history, and so on [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, it is known that polyether glycol has a good resistance for hydrolysis and poor property for UV irradiation [ 11 , 12 , 13 , 14 , 15 , 16 ], and that polyester glycol has the opposite trends for these properties. The polycarbonate (PC)-glycol is a relatively new one bearing both features [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Thus, they are employed depending on the situation of the practical uses.…”

Section: Introductionmentioning

confidence: 99%

Control of Mechanical Properties of Thermoplastic Polyurethane Elastomers by Restriction of Crystallization of Soft Segment

et al. 2010

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Mechanical properties of thermoplastic polyurethane elastomers based on either polyether or polycarbonate (PC)-glycols, 4,4’-dipheylmethane diisocyanate (1,1’-methylenebis(4-isocyanatobenzene)), 1,4-butanediol, were controlled by restriction of crystallization of polymer glycols. For the polyether glycol based-polyurethane elastomers (PUEs), poly(oxytetramethylene) glycol (PTMG), and PTMG incorporating dimethyl groups (PTG-X) and methyl side groups (PTG-L) were employed as a polymer glycol. For the PC-glycol, the randomly copolymerized PC-glycols with hexamethylene (C6) and tetramethylene (C4) units between carbonate groups with various composition ratios (C4/C6 = 0/100, 50/50, 70/30 and 90/10) were employed. The degree of microphase separation and mechanical properties of both the PUEs were investigated using differential scanning calorimetry, dynamic viscoelastic property measurements and tensile testing. Mechanical properties could be controlled by changing the molar ratio of two different monomer components.

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“…Površina ispod kristalnih i amorfnih pikova je proporcionalna njihovom zapreminskom udelu u uzorku [36]. Na svim difroktogramima uočen je mali pik oko 13° koji odgovara srednjem rastojanju karbonatnih grupa [2]. Za poliuretan sa malim sadržajem tvrdih segmenata (17 mas.%), uočava se samo široki pik pri 2θ 21,1°, što znači da je uzorak amorfan na sobnoj temperaturi [37,38].…”

Section: Stepen Kristalnosti Sintetisanih Poliuretanskih Materijalaunclassified

“…U novije vreme, predmet brojnih istraživanja u oblasti polimernih materijala predstavlja dobijanje segmentiranih linearnih poliuretana primenom različitih makrodiolnih komponenti [1]. Posebna pažnja je posvećena postupcima sinteze i karakterizacije termoplastičnih poliuretanskih materijala dobijenih primenom alifatskih polikarbonatnih diola [2][3][4], koji imaju veću cenu u odnosu na tradicionalne poliuretane dobijene primenom poliestra ili polietra, ali imaju poboljšana fizička, mehanička, termička, antihidroizolaciona i antioksidaciona svojstva [5][6][7]. Ispitivanje odnosa strukture i svojstava segmentiranih poliuretana je veoma važno zbog mogućnosti njihove primene, a prednost ovih materijala je to što im se svojstva mogu menjati veoma jednostavno, variranjem sastava komponenti i uslova sinteze.…”

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The influence of hard segment content on mechanical and thermal properties of polycarbonate-based polyurethane materials

Pavličević

Špírková

Budìnski‐Simendìć

et al. 2012

Hem Ind

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Aliphatic segmented polyurethanes were prepared by one-step procedure in catalytic reaction between polycarbonate diol, hexamethylene-diisocyanate and 1,4-butandiol (as chain extender). The hard segment content TS was varied (17, 24, 30 and 42 wt. %) by changing the ratio of starting compounds. The soft segment is made from flexible aliphatic polycarbonate diol, while hard segments consist of chain extender and diisocyanate component. In order to study the hydrogen bonding formation and phase separation, Fourier transform infrared spectroscopy (FT-IR) was used. Wide angle X-ray scattering (WAXS) was performed to determine a degree of crystallinity and to investigate the phase behavior of prepared elastomers. The effect of TS content on mechanical properties (tensile strength, elongation at break and hardness) was tested. Thermal behavior of prepared novel polycarbonate-based polyurethanes was investigated using differential scanning callorimetry (DSC). It was determined that the elastomer which contains the highest amount of urethane groups in its structure (TS content of 42 wt. %) exhibits the most pronounced phase separation and the highest degree of crystallinity. All prepared polyurethanes exhibit high elongation at break (over 700%). The glass transition temperature Tg of prepared samples was in the temperature region from −39 to −36°C, and it was found to be slightly influenced by the soft segment content. The enthalpy of chain segments relaxation in diffused region between hard and soft domains (detected in the temperature range from 35 to 55 °C) was decreased with the increase of hard segment content. The multiple melting of hard segments (connected with the dissruption of physical crosslinks) appeared above 100 °C. It was found that the melting enthalpy linearly increases with the increase of urethane group content. Sample with 42 wt. % of TS has the highest value of melting enthalpy (41.5 J/g)

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Structure and Properties of Aliphatic Poly(carbonate) glycols with Different Methylene Unit Length

Abstract: Aliphatic poly(carbonate) glycols (PC-glycols) with different methylene unit lengths were synthesized from

Cited by 20 publications

References 10 publications

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

Poly(carbonate‐urea‐urethane) networks exhibiting high‐strain shape‐memory effect

Control of Mechanical Properties of Thermoplastic Polyurethane Elastomers by Restriction of Crystallization of Soft Segment

The influence of hard segment content on mechanical and thermal properties of polycarbonate-based polyurethane materials

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