Effect of molar ratio [NCO]/[OH] groups during prepolymer chains extending step on the morphology and selected mechanical properties of final bio‐based thermoplastic poly(ether‐urethane) materials

Kasprzyk, Paulina; Datta, Janusz

doi:10.1002/pen.24874

Cited by 21 publications

(14 citation statements)

References 34 publications

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“…Isocyanate index NCO:OH=1.1:1 in S-TPU(PCL)1.1 might have contributed to the partial cross-linking of polymer chains, which is manifested by better mechanical properties, significantly higher elongation at break, and higher (~91°ShA) hardness than S-TPU(PCL)0.9 sample (~84°ShA). These observations were consistent with the research that was carried out by Kasprzyk et al [40], in which, among others, the influence of the isocyanate index on selected mechanical properties of polyesterurethanes was examined.…”

Section: Resultssupporting

confidence: 92%

Medical-Grade PCL Based Polyurethane System for FDM 3D Printing—Characterization and Fabrication

et al. 2019

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The widespread use of three-dimensional (3D) printing technologies in medicine has contributed to the increased demand for 3D printing materials. In addition, new printing materials that are appearing in the industry do not provide a detailed material characterization. In this paper, we present the synthesis and characterization of polycaprolactone (PCL) based medical-grade thermoplastic polyurethanes, which are suitable for forming in a filament that is dedicated to Fused Deposition Modeling 3D (FDM 3D)printers. For this purpose, we synthesized polyurethane that is based on PCL and 1,6-hexamethylene diisocyanate (HDI) with a different isocyanate index NCO:OH (0.9:1, 1.1:1). Particular characteristics of synthesized materials included, structural properties (FTIR, Raman), thermal (differential scanning calorimetry (DSC), thermogravimetric analysis (TGA)), mechanical and surfaces (contact angle) properties. Moreover, pre-biological tests in vitro and degradation studies were also performed. On the basis of the conducted tests, a material with more desirable properties S-TPU(PCL)0.9 was selected and the optimization of filament forming via melt-extrusion process was described. The initial biological test showed the biocompatibility of synthesized S-TPU(PCL)0.9 with respect to C2C12 cells. It was noticed that the process of thermoplastic polyurethanes (TPU) filaments forming by extrusion was significantly influenced by the appropriate ratio between the temperature profile, rotation speed, and dosage ratio.

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Section: Resultssupporting

confidence: 92%

Medical-Grade PCL Based Polyurethane System for FDM 3D Printing—Characterization and Fabrication

et al. 2019

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“…The most of presented TPUs based on poly ether polyols showed tensile strength in the range from 4 to 40 MPa, elongation at break up to 900%, hardness up to 30 °ShD, and Young's modulus in the range from 18 to 60 MPa. Materials obtained in this work possess mechanical properties comparable with other presented works [7,13,18,49,[49][50][51][52].…”

Section: Mechanical Propertiessupporting

confidence: 81%

“…This observation is connected to higher content of hard segments in samples (PO3G1000_0.95, PO3Gmix_0.9 and PO3Gmix_0.95). According to the literature, TPUs showed the T HS of < 100 °C, and the melting temperature of HS of > 100 °C [13,47].…”

Section: Dynamic Mechanical Thermal Analysismentioning

confidence: 97%

“…Materials prepared with using polyol M w = 2000 g/mol, (%NCO in prepolymer equal 6%) posses 31.8% of HS and showed DPS equal 0.640. While materials obtained from polyol M w = 1000 g/ mol, (%NCO = 6%) have 38.7% of HS and DPS = 0.609 [13,18].…”

Section: Ftirmentioning

confidence: 99%

“…However, the ideal phase separation is never achieved. Hard segments (HS) always partially mix with soft segments (SS), and the glass transition temperatures (T g ) depend on the degree of microphase separation [10,13].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

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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.

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Synthesis and properties of castor oil‐based polyurethane containing short fluorinated segment

Cheng

Lee

et al. 2020

J of Applied Polymer Sci

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This study successfully incorporated a short‐segment fluorine‐containing chain extender (2,2,3,3‐tetrafluoro‐1,4‐butanediol [TF]) into castor oil‐based polyurethane (COPU) to synthesize TF/COPUs. The interactions between TF and COPU components were identified by Fourier transform infrared and X‐ray photoelectron spectroscopies, the results revealed that the increase in the TF content increased the van der Waals forces in CF…CO and the hydrogen bonding force in CF…HN. Atomic force microscopy indicated that the addition of more TF contributed to a higher level of microphase separation in the TF/COPUs. Thermogravimetric analysis showed that the TF component can enhance the thermal resistance of TF/COPUs. Differential scanning calorimetry and dynamic mechanical analysis indicated that the glass transition temperature (Tg) of TF/COPUs increased with the TF content. The stress–strain testing showed that the tensile strength and elongation at break values decreased with the TF content. This tensile behavior may be due to the molecular weight of a TF/COPU decreased with the TF content as evidenced by the gel permeation chromatography results. The hydrolytic degradation tests of dipping TF/COPUs in 3 wt% NaOH solution indicated that TF could lower the surface free energy and enhance the degradation stability of TF/COPUs.

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Effect of molar ratio [NCO]/[OH] groups during prepolymer chains extending step on the morphology and selected mechanical properties of final bio‐based thermoplastic poly(ether‐urethane) materials

Cited by 21 publications

References 34 publications

Medical-Grade PCL Based Polyurethane System for FDM 3D Printing—Characterization and Fabrication

Medical-Grade PCL Based Polyurethane System for FDM 3D Printing—Characterization and Fabrication

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

Synthesis and properties of castor oil‐based polyurethane containing short fluorinated segment

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