Micro‐phase separation kinetics of polyurethane nanocomposites with neural network

Jouibari, Iman Sahebi; Haddadi‐Asl, Vahid; Ahmadi, Hanie; Mirhosseini, Mohammad

doi:10.1002/pc.25250

Cited by 17 publications

(13 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This dependences was confirmed by Niemczyk et al [31]. Jouibari et al [32] synthesized poly(etherurethane)s, which showed 0.7 of DPS value. Fuensanta et al [33] synthesized thermoplastic polyurethane coatings with mixture of polyethers.…”

Section: Ftirmentioning

confidence: 56%

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

View full text Add to dashboard Cite

The man aim of this work was to investigate the effect of the molecular weight of polyols, mixture of prepolymers, and [NCO]/[OH] molar ratio used during the prepolymer chain extending step on the chemical structure, thermomechanical and mechanical properties, and thermal stability of thermoplastic poly(ether-urethane)s In this work thermoplastic poly(etherurethane)s were synthesized by using polyols with a various molecular weight, 4,4′-diphenylmethane diisocyanate and biobased glycol. Materials were obtained by a two-step method. The tests were carried out for polyurethanes obtained from a mixture of prepolymers and for reference samples. In the case of materials obtained with using mixture of prepolymers, the ratio of both prepolymers was determined on 50/50 weight percent. Soft segments of materials prepared with using mixture consist of two different polyols. The chemical structure was analyzed using FTIR spectroscopy. The Gaussian deconvolution technique was used to study the hydrogen bonding as well as to decompose carbonyl region of three peaks in various TPUs. The thermal degradation behavior was investigated by using thermogravimetric analysis at heating rates of 10 °C/ min. It was confirmed that the mixture of prepolymers has an effect of the degree of phase separation, thermal stability and selected properties of synthesized thermoplastic poly(ether-urethane)s.

show abstract

Section: Ftirmentioning

confidence: 56%

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

View full text Add to dashboard Cite

show abstract

“…1 Polymer networks (physical or chemical) with elastic nature possess high shape memory performance. 2 Polyurethanes (PUs) are great candidates for shape memory biomaterials with semi-crystalline or amorphous soft domains, acting as the switching component, and hard domains with higher rigidity, acting as the permanent component. 3 Polyurethanes are segmented copolymers comprised of soft and hard segments.…”

Section: Introductionmentioning

confidence: 99%

Stimuli‐responsive polyurethane bionanocomposites of poly(ethylene glycol)/poly(ε‐caprolactone) and [poly(ε‐caprolactone)‐grafted‐] cellulose nanocrystals

Ranjbar

Nourany

Mollavali³

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

In this study, in situ polyurethane (PU) bionanocomposites of poly(ethylene glycol) (PEG)/poly(ε-caprolactone) (PCL) polyols, bare cellulose nanocrystals (CNCs) and PCLgrafted CNCs (G-CNC) were synthesized with different contents of CNCs as crosslinking agent to control the extent of phase separation. The effect of confining the chains between CNCs through urethane linkages and presence of PCL grafts on phase and crystallization behavior was evaluated. Crystallization and chemical networking were controlled to tune the shape fixity (SF) and recovery (SR) of the specimens, resulting in a SF of 100% for linear and PU nanocomposites of G-CNC (0.5% and 1%) samples. The PU nanocomposite of G-CNC (0.5%) was selected as the optimum sample with the highest SR of 100%. The effect of surface hydrophobicity on cellular behavior of Human Foreskin Fibroblast (as a normal cell) and HepG2 (as a cancerous cell) cells was evaluated. Cell adhesion analysis of the prepared samples indicated two different behaviors possibly due to the difference in the epigenetic nature of the cells and cellular integrin-based bonds showing a great potential for a variety of tissue engineering applications.

show abstract

“…1). To this end, bands of free and hydrogen-bonded N H stretching vibrations at respective wavenumbers of 3445 and 3348 cm −1 were followed and the degree of microphase separation (DPS) was calculated using Eqn (1) 30 :…”

Section: Resultsmentioning

confidence: 99%

“…During the microphase separation process, the large surface of MWCNTs can act as a platform to assist hard domain formation, and thus adsorption of stiffer blocks on the surface of MWCNTs would be favored. 33 The Avrami equation was also used to study the microphase separation behavior of the samples using the results of time sweep rheological measurements (Eqn (3)) 34,35 :…”

Section: Rheological Measurementsmentioning

confidence: 99%

Mono‐filler and bi‐filler composites based on thermoplastic polyurethane, carbon fibers and carbon nanotubes with improved physicomechanical and engineering properties

Farzaneh

Rostami

Nazockdast

2021

Polymer International

View full text Add to dashboard Cite

Two types of carbon-based fillers, i.e. multi-walled carbon nanotubes and carbon fibers, were incorporated into thermoplastic polyurethane (TPU) through melt mixing to prepare mono-filler and bi-filler composites. It was evaluated as to how much the properties of bi-filler composites were different from those of their mono-filler counterparts. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) and time sweep rheological measurements were employed to study the microphase separation of TPU. The quantitative results of ATR-FTIR corroborated that the bi-filler composites possessed greater microphase separation compared to their mono-filler counterparts. The kinetics of networks formed by microphase separation was accelerated for the composite samples compared to neat TPU. The fillers acting as platforms provided a suitable surface for the hard segments to form microphase-separated domain networks. Conductivity measurement proved that the electrical conductivity values of the bi-filler composites were higher than those of the mono-filler counterparts and the simultaneous presence of fillers decreased the electrical percolation threshold. Moreover, the effect of shear deformation applied during the processing on the rheological and electrical properties of the mono-filler and bi-filler composites was evaluated. It was found that shearing at low rates increased the cross-time of G 0 and G 00 , and vice versa. Shearing at an intermediate rate of 20 s −1 promoted the electrical conductivity of both mono-filler and bi-filler composites and coherently decreased the electrical percolation threshold.

show abstract

Micro‐phase separation kinetics of polyurethane nanocomposites with neural network

Cited by 17 publications

References 58 publications

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

Stimuli‐responsive polyurethane bionanocomposites of poly(ethylene glycol)/poly(ε‐caprolactone) and [poly(ε‐caprolactone)‐grafted‐] cellulose nanocrystals

Mono‐filler and bi‐filler composites based on thermoplastic polyurethane, carbon fibers and carbon nanotubes with improved physicomechanical and engineering properties

Contact Info

Product

Resources

About