Thermal annealing behavior and structure development of crystalline hard segment domain in a melt-quenched thermoplastic polyurethane

Yu, Yang; Osaka, Noboru; Murayama, Satoshi; Saito, Hiromu

doi:10.1016/j.polymer.2013.02.005

Cited by 52 publications

(51 citation statements)

References 32 publications

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“…Crystallizations of two domains can occur simultaneously when the two domains obtained well‐separated T c s or separately if their T c s are close . By application of different thermal treatments, the final morphology of semi‐crystalline block copolymers can be altered, and in this way changes their mechanical properties, degradation rate, or shape‐memory properties . For example, a two stage crystallization took place when the segregated diblock copolymer polyethylene‐poly( L ‐lactide) was slowly cooled from the melt state to temperatures below than the T c s of both crystallizable domains, but when a rapid cooling process was applied coincident crystallization occurred …”

Section: Introductionmentioning

confidence: 99%

The influence of thermal treatment on the morphology in differently prepared films of a oligodepsipeptide based multiblock copolymer

Yan

Fang

Weigel

et al. 2016

Polymers for Advanced Techs

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Degradable multiblock copolymers prepared from equal weight amounts of poly(ε‐caprolactone)‐diol (PCL‐diol) and poly[oligo(3S‐iso‐butylmorpholine‐2,5‐dione)]‐diol (PIBMD‐diol), named PCL‐PIBMD, provide a phase‐segregated morphology. It exhibits a low melting temperature from PCL domains (Tm,PCL) of 38 ± 2 °C and a high Tm,PIBMD of 170 ± 2 °C with a glass transition temperature (Tg,PIBMD) at 42 ± 2 °C from PIBMD domains. In this study, we explored the influence of applying different thermal treatments on the resulting morphologies of solution‐cast and spin‐coated PCL‐PIBMD thin films, which showed different initial surface morphologies. Differential scanning calorimetry results and atomic force microscopy images after different thermal treatments indicated that PCL and PIBMD domains showed similar crystallization behaviors in 270 ± 30 µm thick solution‐cast films as well as in 30 ± 2 and 8 ± 1 nm thick spin‐coated PCL‐PIBMD films. Existing PIBMD crystalline domains highly restricted the generation of PCL crystalline domains during cooling when the sample was annealed at 180 °C. By annealing the sample above 120 °C, the PIBMD domains crystallized sufficiently and covered the free surface, which restricted the crystallization of PCL domains during cooling. The PCL domains can crystallize by hindering the crystallization of PIBMD domains via the fast vitrification of PIBMD domains when the sample was cooled/quenched in liquid nitrogen after annealing at 180 °C. These findings contribute to a better fundamental understanding of the crystallization mechanism of multi‐block copolymers containing two crystallizable domains whereby the Tg of the higher melting domain type is in the same temperature range as the Tm of the lower melting domain type. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

The influence of thermal treatment on the morphology in differently prepared films of a oligodepsipeptide based multiblock copolymer

Yan

Fang

Weigel

et al. 2016

Polymers for Advanced Techs

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“…Additionally, changes in modulus were found. Several authors studied temperature induced alterations of melting and recrystallization characteristics in TPU after thermal exposure . Simultaneously, mechanical properties e.g.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Ageing Mechanisms in Thermoplastic Polyurethanes by Means of IR and Raman Spectroscopy

Bruckmoser

Resch

2014

Macromolecular Symposia

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Summary: Within the present study FTIR and Raman spectroscopy are evaluated as to specific strengths in terms of analysing deterioration in TPU induced by UV radiation or thermal load. A conventional ester based TPU grade formulated from 4,4'-methylene diphenyl diisocyanate, 1,4-butanediol and polycaprolactone was investigated. Exposure to UV was done in a Suntest CPSþ at different exposure times. Thermal treatment was done in an air circulation oven at 180 C and different exposure times. Exposed samples were characterized as to changes in molecular structure with complementary methods ATR and Raman spectroscopy. To establish interrelationships between structural changes and macroscopic material characteristics UV/Vis/NIR spectroscopy and DSC were applied.UV/Vis/NIR spectroscopy clearly indicated yellowing, and thus an increase in absorption in the visible wavelength range, of TPU after exposure to UV or to thermal load. Yellowing correlated well with formation of chromophoric groups detected by ATR and Raman spectroscopy. ATR spectroscopy turned out to be very sensitive in detection of changes in chemical structure induced by UV radiation. Raman spectroscopy was found to be very sensitive in detection of changes in chemical structure induced by thermal load. No distinct effect of UV exposure on morphology of TPU was ascertained. In contrast, a strong effect of thermal treatment on (para)crystalline morphology was observed.

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“…The structure of EPUUs depends on the chemical structure of the substrates used in the synthesis but mostly on the annealing temperature to create a final product. By changing the annealing temperature the mechanical and thermal properties of the produced EPUUs can be changed …”

Section: Introductionmentioning

confidence: 99%

Production and characterization of ureaurethane elastomers with rapeseed‐based polyol

Mizera

Ryszkowska

Kurańska

et al. 2018

Polymer International

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The purpose of this study was to evaluate the effect of rapeseed‐oil‐based (RO) polyol on the thermal and mechanical properties of tested ureaurethane elastomers (EPUUs). The chemical structure and degree of phase separation connected to the value of hydrogen bonds were tested by infrared spectroscopy. Thermal degradation was examined by TGA. The glass transition temperature and the enthalpy of heat effects were analysed by DSC. The mechanical properties were tested by dynamic mechanical thermal analysis and static tensile strength. The physicomechanical properties were also examined, including wear resistance and hardness of the tested materials. The use of RO polyol in 10–40 wt% concentration in polyol premixes changed the chemical structure of the EPUUs indicating a change in the quantity of hydrogen bonds and the degree of phase separation. DSC analysis showed that addition of the RO polyol causes an increase in the glass transition temperature of the soft phase in the EPUUs. © 2018 Society of Chemical Industry

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Thermal annealing behavior and structure development of crystalline hard segment domain in a melt-quenched thermoplastic polyurethane

Cited by 52 publications

References 32 publications

The influence of thermal treatment on the morphology in differently prepared films of a oligodepsipeptide based multiblock copolymer

The influence of thermal treatment on the morphology in differently prepared films of a oligodepsipeptide based multiblock copolymer

Investigation of Ageing Mechanisms in Thermoplastic Polyurethanes by Means of IR and Raman Spectroscopy

Production and characterization of ureaurethane elastomers with rapeseed‐based polyol

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