Exploring the Influence of Methylene Diphenyl Diisocyanate as a Modifier for Ethylene Vinyl Acetate/Thermoplastic Polyurethane Blends

Dutta, Joyeeta; Chatterjee, Tuhin; Ramachandran, Padmanabhan; Naskar, Kinsuk

doi:10.1080/03602559.2017.1410847

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…As is well-known, the performance of TPVs strongly depends on their final morphology, which are affected by many factors, such as cross-linking degree, composition ratio, viscosity ratio of the two individual components, the processing condition, etc. [9,10,11,12,13]. Machado et al [11] studied the effect of cross-linking on the phase inversion of polypropylene (PP) and ethylene-propylene-diene rubber (EPDM) blends and found that the position of the phase inversion region is essentially governed by the composition ratio and is independent of the viscosity ratio of PP/EPDM blends.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Yang

Guo

2019

Polymers

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As a special class of “green” elastomers, thermoplastic vulcanizates (TPVs) have been widely used in industries due to the combination of the excellent resilience of conventional elastomers and the easy recyclability of thermoplastics. Here, the morphology evolution of TPVs based on polyamide 6/ethylene-propylene-diene rubber (PA6/EPDM) blends was investigated by varying the content of the curing agent, phenolic resin (PF). With the incorporation of 6 wt% PF, the gel content of the EPDM phase reaches a high value of 49.6 wt% and a typical sea-island structure is formed with EPDM domain in a micro-nano size. The dynamic rheology behaviors of TPVs showed that with the curing degree of EPDM phase increasing, a denser network of EPDM particles is formed in PA6 matrix. Additionally, a lower crystal degree and crystal peak temperature are observed, indicating that there exists a growth restriction of PA6 crystal plate induced by a thinner plastic layer between the adjacent EPDM particles. However, the crystal form of PA6 is not changed with the increasing curing degree of the EPDM phase. This study provides an effective strategy to realize a new kind of TPVs, which can be easily introduced into industrial applications.

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Section: Introductionmentioning

confidence: 99%

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Yang

Guo

2019

Polymers

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“…However, due to the more rubbery nature of EVA, such modified grades showed a much higher extension than others (evident from the tensile data of CC0 where the maximum elongation increased from 516.32% F I G U R E 1 Fourier transform infrared (FTIR) spectra of pristine and a modified thermoplastic polyurethane (TPU) to 962%). 67 Although the tensile strength of uncut samples having a higher content of TPU (in the masterbatch) showed a steady decrease, the samples with 70:30 and 80:20 blend ratios exhibited an enhanced tensile strength along with the healing cycles. This can be exemplified with CC0 (blend ratio = 70:30) that showed an increase in the tensile strength from 11.57 MPa to 16.35 MPa after the fifth healing cycle (Figure 2.3a).…”

Section: Tensile Propertiesmentioning

confidence: 92%

“…Since the extent of networking was small, it finally broke at a higher frequency and recorded a lower complex viscosity. 67 CC0 thus emerged as one of the best compositions in the series delineating maximum healing efficiency due to controlled viscoelastic flow across the interfacial region of the cut surface (one may note that one representative of the chosen two samples CC0 and BB0 were tested for demonstration).…”

Section: Rheological Studymentioning

confidence: 99%

Fabrication of self‐healable thermoplastic polyurethane by masterbatch technology

Dasgupta

Basak

Sengupta

et al. 2021

J of Applied Polymer Sci

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This paper reports development of self-healable thermoplastic polyurethane (TPU) compound through the mixing of masterbatches of TPU and EVA (poly [ethylene-co-vinyl acetate]) (EVA) having various mole compositions. The aim was to promote a limited chemical interaction between TPU and EVA in the pristine compound that can enhance viscoelastic flow across the cut surface for autonomic healing. The healing was externally stimulated through microwave irradiation and the healing efficiency was determined from changes in tensile properties and complemented by image analysis. Infrared spectroscopy was used to detect TPU-EVA crosslinking in the TPU compound, which was further delineated from viscoelastic and swelling results. Tensile properties demonstrated a drop in tensile modulus, strength, and elongation at break than original TPU on increasing EVA concentration, but those, at the same time, were retained until the fifth healing cycles with higher EVA concentration in the masterbatch. The healing mechanism was attributed to the destruction of the hard domain in TPU leading to a marked increase in viscoelastic mobility at the interface of the cut section. The pristine TPU modified with higher amount of EVA in the masterbatch exhibited the highest range of healing efficiency (sample CC0-93%, sample BB0-97%, respectively)), reinstated the hypothesis of mixing a higher amount of EVA to promote autonomic healing. EVA based TPU compounds with superior self-healing property makes them an ideal candidate for applications in cable insulation and shape-memory devices.

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“…Poor fluid absorption properties of TPS0 samples without spirulina may be caused by lower water molecule access between partly cross-linked chains. [60] However, the addition of hydrophilic-based spirulina led to a significant increase in swelling values (around 262 %).It is suggested that wound exudate be absorbed effectively and that the wound site be kept clean. [61] The swelling activity absorbs wound exudates, keeping the wound dry and preventing bacteria from growing.…”

Section: Interactions With Media (Fluid Absorption Test)mentioning

confidence: 99%

Spirulina Biomass‐Loaded Thermoplastic Polyurethane/Polycaprolacton (TPU/PCL) Nanofibrous Mats: Fabrication, Characterization, and Antibacterial Activity as Potential Wound Healing

Parın

2022

ChemistrySelect

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The development of antibacterial products with therapeutic properties has become a popular human health trend. Herein, for the first time, we described an effective antibacterial thermoplastic polyurethane/polycaprolacton (TPU/PCL) composite nanofibers loaded with the spirulina biomass by electrospinning method for wound care applications. The chemical, microstructural, mechanical, wettability properties and antibacterial activities of produced electrospun TPU/PCL/spirulina fibers with varied spirulina concentrations (1, 3, and 5 %, w/v to polymer solution) were investigated by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), UV-VIS Spectroscopy, optical tensiometer and tensile testing machine. The SEM micrographs revealed that all resultant fibers have an average fiber diameter of 228-312 nm and a significant porosity (86-90 %). FT-IR spectrum pointed out no chemical bonding between spirulina and polymer matrixes.Increasing the spirulina content caused an increased swelling capacity of the nanofibers. Furthermore, TPU/PCL/spirulina samples indicated superhydrophilic property with contact angle values almost 36°, 0°, and 0°, respectively. The resultant TPU/PCL/spirulina fibers, released 36.89 ppm, 59.4 ppm, and 209.1 ppm of the spirulina after 8 hours, respectively and showing the effect of interactions between the TPU/PCL matrix and the spirulina on its release of the TPU/PCL matrix. Fluid absorption value have increased as incorporation of spirulina into the polymer matrix. All TPU/PCL/spirulina fibers and spirulina have antibacterial efficiency against E.colibacteria.TPU/ PCL nanofiber with the highest amount of spirulina (5 %) has the highest tensile strength with 3.89 � 0.19 MPa.The electrospun TPU/PCL/spirulina nanofibers appear to be a potential candidate material for tissue engineering and wound care applications, based on our results.

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Exploring the Influence of Methylene Diphenyl Diisocyanate as a Modifier for Ethylene Vinyl Acetate/Thermoplastic Polyurethane Blends

Cited by 6 publications

References 46 publications

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Fabrication of self‐healable thermoplastic polyurethane by masterbatch technology

Spirulina Biomass‐Loaded Thermoplastic Polyurethane/Polycaprolacton (TPU/PCL) Nanofibrous Mats: Fabrication, Characterization, and Antibacterial Activity as Potential Wound Healing

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