Study on thermal stability of polyurethane-urea based on polysiloxane and polycaprolactone diols

Askari, Fahimeh; Barikani, Mehdi; Barmar, Mohammad

doi:10.1007/s11814-013-0139-z

Cited by 16 publications

(14 citation statements)

References 23 publications

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“…Molar ratios of polyols:isocyanate:chain extenders were kept constant at 1:2:1. A typical two‐step solution polymerization procedure as was reported previously by our group was performed …”

Section: Methodssupporting

confidence: 82%

Polyurethane/amino‐grafted multiwalled carbon nanotube nanocomposites: Microstructure, thermal, mechanical, and rheological properties

Askari

Barikani

Barmar

et al. 2016

J of Applied Polymer Sci

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A mixture of two different polyols, (polytetramethylene ether glycol and polydimethylsiloxane), were employed to synthesize a new structure of polyurethane (PU) with methylene diphenyl diisocyanate (MDI) and 1,4-butanediol as chain extender. PU nanocomposites containing variable amount (0.3, 0.5, 1, and 3 wt %) of amino-grafted multiwalled carbon nanotubes (NH 2 -MWNT) were prepared via in situ polymerization. The dispersion of NH 2 -MWNT into polymer matrix was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Fourier transform infrared spectroscopy (FT-IR) confirmed the urethane-urea chemical bonding between the PU chains and the NH 2 -MWNT. Thermal stabilities of the nanocomposites were examined with thermogravimetric analysis (TGA) and the results indicated a remarkable improvement with increasing NH 2 -MWNT contents. The results of dynamic mechanical thermal analysis (DMTA) including storage modulus (E 0 ) and glass transition temperature (T g ), as well as tensile properties demonstrated that the yield strength, strain-at-break, and young modulus were enhanced by increasing NH 2 -MWNT content. Rheological behavior including complex viscosity and storage and loss moduli of the PU nanocomposites improved with increasing NH 2 -MWNT loading, as well.

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Section: Methodssupporting

confidence: 82%

Polyurethane/amino‐grafted multiwalled carbon nanotube nanocomposites: Microstructure, thermal, mechanical, and rheological properties

Askari

Barikani

Barmar

et al. 2016

J of Applied Polymer Sci

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“…The first stage of degradation at 330 to 346 °C corresponded to breakage of the urethane bond. The second stage at 367 to 432 °C corresponded to the decomposition of the HTWT, and the third stage at 451 to 466 °C corresponded to the decomposition of the PCL diols …”

Section: Resultsmentioning

confidence: 96%

“…The second stage at 367 to 432 8C corresponded to the decomposition of the HTWT, 5,11,12 and the third stage at 451 to 466 8C corresponded to the decomposition of the PCL diols. 31,37 Biodegradation of PUF The Sturm test is one of the most well-known biodegradability tests due to its simplicity. This test is generally used for a preliminary study of new potentially biodegradable materials.…”

Section: Morphology Of Pufmentioning

confidence: 99%

Polyurethane foams from oligomers derived from waste tire crumbs and polycaprolactone diols

Rattanapan

Pasetto

Pilard

et al. 2016

J of Applied Polymer Sci

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This work was an initial study on the synthesis of polyurethane foams (PUF) by using diols obtained from the controlled degradation of waste tire crumbs and from polycaprolactone (PCL) followed by examination of their biodegradability. Natural rubber (NR, cis−1,4 polyisoprene) and butadiene rubber (BR) chains contained in waste tire crumbs were chemically modified into carbonyl telechelic (CTWT) and successively into hydroxyl telechelic oligomers (HTWT). Four types of PUF were prepared with different molar ratios between the HTWT and the PCL diols. CTWT and HTWT were analyzed by 1H‐NMR, SEC, and FT‐IR to confirm their chemical structure. Formation of the urethane bond was demonstrated by FT‐IR spectra. The addition of the PCL diol increased the thermal degradation temperature of the PUF based on thermogravimetric analysis. According to scanning electron microscopy, polyhedral closed cells were obtained. The molar ratio of HTWT/PCL diols strongly affected the kinetic rate of foam formation and foam morphology. A low kinetic rate provided PUF with a high density, small cell size, and a broad cell size distribution. In order to assess biodegradation of PUF, the modified Sturm test was carried out for 60 days at ambient temperature (27–30 °C). The biodegradation of PUF containing only HTWT was 31.2% and 51.3% at 28 days and 60 days of testing, respectively whereas the PUF containing 1/0.5 HTWT/PCL diols (by mole) showed a higher biodegradation: 39.1% and 64.3% at 28 days and 60 days of testing respectively. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44251.

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“…Molar ratios of polyols, isocynate, and chain extenders were kept constant at 1:2:1. A typical two-step solution polymerization procedure was performed as was reported in our previous work [11]. Briefly, molten MDI was poured in a three-necked round flask equipped with a stirrer, nitrogen inlet, and an additional funnel, and the flask was placed in an oil bath at 68-70 °C.…”

Section: Synthesis Of Polyurethane-urea Thermoplastic Elastomersmentioning

confidence: 99%

“…These materials contain the main advantages of both urethane and siloxane moieties, i.e., good elasticity and tensile strength which are characteristic of PUs, and high elasticity (especially at low temperatures) combined with good thermal and chemical stability which are attributed to the structure of polysiloxanes [11]. The influence of different polydimethylsiloxanes on lowering the value of free surface energy of PUs is also significant [6].…”

Section: Introductionmentioning

confidence: 99%

Study of thermal stability and degradation kinetics of polyurethane–ureas by thermogravimetry

et al. 2015

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Study on thermal stability of polyurethane-urea based on polysiloxane and polycaprolactone diols

Cited by 16 publications

References 23 publications

Polyurethane/amino‐grafted multiwalled carbon nanotube nanocomposites: Microstructure, thermal, mechanical, and rheological properties

Polyurethane/amino‐grafted multiwalled carbon nanotube nanocomposites: Microstructure, thermal, mechanical, and rheological properties

Polyurethane foams from oligomers derived from waste tire crumbs and polycaprolactone diols

Study of thermal stability and degradation kinetics of polyurethane–ureas by thermogravimetry

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