The influence of the nanofiller on thermal properties of thermoplastic polyurethane elastomers

Ristić, Ivan; Krakovský, Ivan; Janić, Teodora; Cakić, Suzana; Miletić, Aleksandra; Jotanović, Milovan; Radusin, Tanja

doi:10.1007/s10973-018-7278-8

Cited by 11 publications

(10 citation statements)

References 15 publications

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“…The choice of a chain extender depends on the properties required and the process conditions. Chain extender may increase the hard segment length to allow hard segment segregation which results in good mechanical properties such as an increase in modulus and the hard segment glass transition temperature of polyurethane [5][6][7][8][9][10][11][12][13][14]. In general, PUR chain extended with an aliphatic diol to produce a softer material than do their aromatic chain extended counterparts.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of polyurethane elastomers matrix with different chain extender contents for thermal conductive application

Somdee

Lassú-Kuknyó²,

Kónya³

et al. 2019

J Therm Anal Calorim

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Polyurethane elastomers (PUR) based on polypropylene glycol and 4,4 0-diphenylmethane diisocyanate were prepared with various monoethylene glycol (mEG) contents. The aim of this study is to find a reliable polymer matrix for composites of improved thermal conductivity and testing fully in order to collect knowledge about its structure. Thermal conductivity was improved from 0.255 to 0.329 W m-1 K-1 when increasing chain extender content. This attributed to a high appearance crystalline ordering level when adding high mEG content. Differential scanning calorimetry revealed a low transition temperature of soft segment at the same temperature around-64°C, due to constant polyol content. The enthalpy of melting increases with increasing mEG content. This is due to the increasing crystalline phase and hard segment phase separation within the PUR structure. Dynamic mechanical analysis results show the glass transition temperature of soft segment in the same temperature range between-57 and-52°C and intensity peak of tand tends to decrease when mEG content was increased. On the other hand, the glass transition temperature of hard segment tends to increase from 10 to 93°C and has high intensity peak of tand with increasing mEG content. Increasing the chain extender content can be enhancing the hard segment length in PUR structure and affecting both soft segment motion and hard segment motion. Increasing hard segment length might be obstructing soft segment motion and influence hard segment motion which is hard to move at low temperatures. Phase separation of soft and hard segment clearly observed using the DMA technique.

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Section: Introductionmentioning

confidence: 99%

Thermal analysis of polyurethane elastomers matrix with different chain extender contents for thermal conductive application

Somdee

Lassú-Kuknyó²,

Kónya³

et al. 2019

J Therm Anal Calorim

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“…Samples (approximately 10 mg) were tested in a nitrogen gas environment at a flow rate of 200 ml/min, at a temperature range of 30–1000°C with a temperature increase of 20°C/min, using ceramics pans. 96,97…”

Section: Methodsmentioning

confidence: 99%

The effect of boric acid on flame retardancy of intumescent flame retardant polypropylene composites including nanoclay

Demirhan

Yurtseven

Usta

2021

Journal of Thermoplastic Composite Materials

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In this study, different amounts of boric acid (BA, 1.25, 2.5, 3.75 and 5.0 wt%) were used to enhance the effectiveness of an intumescent flame retardant (IFR) system composed of ammonium polyphosphate (APP) and pentaerythritol (PER) in polypropylene (PP) including 2 wt% montmorillonite nanoclay (MMT). Meanwhile, metaboric acid and boron oxide which were generated by the decomposition of BA appeared in the melt compounding and the burning processes, respectively. Extensive experimental studies were performed to investigate the effects of BA/boron oxide and MMT combinations on the properties of PP/IFR. The fire resistances of the composites were studied by UL 94, limiting oxygen index (LOI) and cone calorimetry tests. The thermal properties were determined by using thermogravimetric analysis, differential scanning calorimetry and thermal conductivity measurements. In addition, the mechanical properties of the composites were examined. The experimental results revealed that although the additions of 1.25 and 2.5 wt% BA with 2 wt% MMT significantly enhanced thermal and flame resistances of PP composites, 3.75 and 5.0 wt% BA additions generated antagonistic effects and deteriorated the fire resistance of the composites. The sample including 2.5 wt% BA addition achieved the best flame retardancy. The LOI value was increased from 18 to 31% with UL 94 V-0 rating. In addition, the peak heat release rate was reduced from 668.6 to 150.0 kW/m2 and the total heat release value was decreased from 247.9 to 98.4 MJ/m2. In the meantime, the thermal conductivity was increased from 0.22 up to 0.28 W/mK. Furthermore, CO, CO2 and the smoke productions were significantly decreased with respect to PP. NO generation was decreased with BA replacements. At the same time, although there was a slight decrease in the tensile strength, the flexural strength significantly increased with BA and MMT additions.

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“…Several green or common solvents such as DMF, THF, 2-butanone, cyclohexanone, NMP, and DMAc are employed. 309,[311][312][313][314][315][316][317] As an example, TPU was synthesized from HDI with different PTHF/isosorbide ratios without a catalyst, in a green chemistry approach. Isosorbide as a cycloaliphatic compound endowed the TPU with rigidity, which was translated by an increase in T g and elastic modulus from À48 1C to À39 1C and 16 to 42 MPa, respectively, with a high elongation (around 500%) decrease.…”

Section: From Carbohydratesmentioning

confidence: 99%

“…Several green or common solvents such as DMF, THF, 2-butanone, cyclohexanone, NMP, and DMAc are employed. 309,311–317…”

Section: Sustainable Cycloaliphatic Building Blocks For the Synthesis...mentioning

confidence: 99%

Sustainable cycloaliphatic polyurethanes: from synthesis to applications

Mouren

Avérous

2023

Chem. Soc. Rev.

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The influence of the nanofiller on thermal properties of thermoplastic polyurethane elastomers

Cited by 11 publications

References 15 publications

Thermal analysis of polyurethane elastomers matrix with different chain extender contents for thermal conductive application

Thermal analysis of polyurethane elastomers matrix with different chain extender contents for thermal conductive application

The effect of boric acid on flame retardancy of intumescent flame retardant polypropylene composites including nanoclay

Sustainable cycloaliphatic polyurethanes: from synthesis to applications

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