Structure−Mechanical Property Relationships for Poly(carbonate urethane) Elastomers with Novel Soft Segments

Kojio, Ken; Furukawa, Mutsuhisa; Motokucho, Suguru; Shimada, Makoto; Sakai, Machiko

doi:10.1021/ma901317t

Cited by 92 publications

(89 citation statements)

References 25 publications

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“…From Table 5, &T g decreased with increasing CL molar fraction, suggesting that microphase separation between HS (HMDI-BDO) and SS (PCL-co-PTMC) became stronger. This is attributed to the effect of soft segment crystallization that could promote the phase separation, and is comparable to the studies reported on PU based on polycarbonates [27], PEO and PEO-PPO-PEO [28].…”

Section: (Pcl-co-ptmc) Polyurethanessupporting

confidence: 88%

Enhancing mechanical properties of thermoplastic polyurethane elastomers with 1,3-trimethylene carbonate, epsilon-caprolactone and L-lactide copolymers via soft segment crystallization

Liow¹,

Lipik²,

Widjaja³

et al. 2011

Express Polym. Lett.

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Abstract. Multiblock thermoplastic polyurethane elastomers based on random and triblock copolymers were synthesized and studied. Dihydroxyl-terminated random copolymers were prepared by ring opening copolymerization of !-caprolactone (CL) and 1,3-trimethylene carbonate (TMC). The triblock copolymers were synthesized by using these random copolymers as macro-initiator for the L-lactide (L-LA) blocks. These random and triblock copolymers were further reacted with 1,6-hexamethylene diisocyanate (HMDI) and chain extended by 1,4-butanediol (BDO). The polymer structure and chemical composition were characterized by 1 H NMR 13 C NMR and SEC. Their thermal and mechanical properties were studied by using DSC and Instron microtester. Multiblock polyurethanes based on random PCL-co-PTMC copolymers showed strain recovery improvement with increasing PCL content. However, these polyurethanes were unable to sustain deformation at body temperature due to the melting of PCL crystals and low hard segments content. With the presence of crystallizable PLLA blocks, mechanical properties were improved at body temperature without compromising their good strain recovery.

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Section: (Pcl-co-ptmc) Polyurethanessupporting

confidence: 88%

Enhancing mechanical properties of thermoplastic polyurethane elastomers with 1,3-trimethylene carbonate, epsilon-caprolactone and L-lactide copolymers via soft segment crystallization

Liow¹,

Lipik²,

Widjaja³

et al. 2011

Express Polym. Lett.

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show abstract

“…On the basis of the DSC curves (see Figs. 4,5), it could be stated that their crystallinity resulted from the crystallization of PCD soft segment. A low tendency of RPURs to crystallization (degree of crystallinity amounting to 2.8 % for S and 15.6 % for M) explains the lack of the crystalline phase, which could be attributed to the crystalline hard-segment domains in the PCURs with a high hard-segment content.…”

Section: Xrd Analysismentioning

confidence: 99%

“…TPUs based on PCDs, which are relatively new ones, have at the same time a high resistance to heat, hydrolysis and oxidation in comparison with TPUs derived from polyether and polyester diols [3][4][5]. The main diisocyanate used is 1,1 0 -methanediylbis(4-isocyanatobenzene) (MDI).…”

Section: Introductionmentioning

confidence: 99%

The effect of chain extender structure on the properties of new thermoplastic poly(carbonate–urethane)s derived from MDI

Rogulska

Kultys

Pikus

2016

J Therm Anal Calorim

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Two series of high-molar-mass thermoplastic poly(carbonate-urethane)s (PCURs) were synthesized from nonconventional sulfur-containing chain extenders, i.e., 2,2 0 -[sulfanediylbis(benzene-1,4-diyloxy)]diethanol (diol SE) and 2,2 0 -[methanediylbis(benzene-1,4-diylmethanediylsulfanediyl)]diethanol (diol ME), 1,1 0 -methanediylbis(4-isocyanatobenzene) and 30, 45 and 60 mol% aliphatic polycarbonate diol of M n = 2000 g mol -1 (Desmophen Ò C2200, Bayer) via a one-step melt polyaddition. The PCURs were investigated by FTIR, UV-Vis, atomic force microscopy, X-ray diffraction analysis, differential scanning calorimetry, thermogravimetry (TG) and TG-FTIR. Moreover, their Shore A/D hardness, tensile, adhesive and optical properties were determined. The obtained PCURs were transparent or opaque elastomers, possessing amorphous or partially crystalline structures. The polymers based on diol ME showed lower glass transition temperatures (-9 to (-8) vs. -7 to 20°C) and better microphase separation. All the PCURs exhibited a relatively good thermal stability. Their temperature of 1 % mass loss was within the range of 284-292°C with somewhat higher values shown by those obtained from diol ME. The PCURs decomposed in two (from diol ME) or three (from diol SE) stages, and for both types of polymers, the main decomposition occurred at the first stage. All the PCURs based on diol SE exhibited higher tensile strength (33.5-41.9 vs. 27.0-31.5 MPa), but smaller elongation at break (300-400 vs. 450-550 %) than polymers derived from diol ME. Somewhat better adhesive properties and a slightly higher refractive index were found for polymer based on diol ME with two sulfur atoms.

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“…The difference in profiles indicates that the crystallization processes of PBS and PHS are different. This can be explained by the ratio of ester bonds in the main chains [19]. Since PBS has a higher ratio of ester bonds, PBS can adopt a stiff crystalline structure.…”

Section: Crystallinitiesmentioning

confidence: 99%

Enzymatic Synthesis and Chemical Recycling of Novel Polyester-Type Thermoplastic Elastomers

Yagihara

Matsumura

2012

Polymers

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Novel polyester-type thermoplastic elastomers based on poly(alkylene succinate)s were synthesized by the lipase-catalyzed copolymerization of cyclic diol/succinate oligomer and cyclic diol/alkylthiosuccinate oligomer. These copolymers exhibited biodegradabilities by activated sludge and a wide range of thermal and mechanical properties that were dependent on the molecular structure and the content of side alkylthio groups. The degree of crystallinity of the copolymer decreased with increasing content of alkylthio groups, which were introduced into the polymer chain as a soft segment. Furthermore, lipase-catalyzed depolymerization of these copolymers into cyclic oligomers and repolymerization of the oligomers was carried out. A repolymerized copolymer having the same M w and monomer composition as the initial copolymer was obtained, indicating the chemical recyclability of the copolymer.

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Structure−Mechanical Property Relationships for Poly(carbonate urethane) Elastomers with Novel Soft Segments

Cited by 92 publications

References 25 publications

Enhancing mechanical properties of thermoplastic polyurethane elastomers with 1,3-trimethylene carbonate, epsilon-caprolactone and L-lactide copolymers via soft segment crystallization

Enhancing mechanical properties of thermoplastic polyurethane elastomers with 1,3-trimethylene carbonate, epsilon-caprolactone and L-lactide copolymers via soft segment crystallization

The effect of chain extender structure on the properties of new thermoplastic poly(carbonate–urethane)s derived from MDI

Enzymatic Synthesis and Chemical Recycling of Novel Polyester-Type Thermoplastic Elastomers

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