Preparation and Characterization of Footwear Soling Materials Based on Biodegradable Polyurethane

Saraswathy, G.; Srinivasan, K.; Mohan, Resmi; Das, B.; Mandal, Asit Baran

doi:10.1080/03602559.2015.1036443

Cited by 17 publications

(14 citation statements)

References 21 publications

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“…The aim was to assess their resistance in soil, rather than their degradability (Urgun- et al 2007) . But the same procedure can be followed to study the susceptibility of PUF to biodegradation and the samples can be assessed for weight loss, tensile strength, and molecular break down (Gnanasundaram et al 2015).…”

Section: Biodegradation Test By Soil Burial Methodsmentioning

confidence: 99%

“…The pre-polymer method was used to prepare polyurethane because this method is currently used by footwear insole/sole manufacturing industries and shoe manufacturing industries to develop insoles by reaction injection molding (RIM) technique (Gnanasundaram et al 2015). The synthesis was carried out in a 250 ml glass reactor at normal pressure and agitation rate 500 rpm (by standard tri-blade impeller) to ensure homogeneous mixing.…”

Section: Synthesis Of Pre-polymermentioning

confidence: 99%

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Novel Insole Material for Weight-Bearing Monitoring Medical Device to Be Used in Fractured Bone Clinic

Rubstova¹

2021

Preprint

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Partial Weight-Bearing (PWB) regime is a part of a recreation process for patients with lower limb fractures/strains/sprains. In order to avoid a frequent foot overloading and achieve better patient compliance with requirement of PWB, the application of Weight-Bearing Monitoring System (WBMS) is highly attractive. However, it is challenging to find an affordable material for protective insole cover that is also a good shock-absorber. In this regard, a new formulation for protective covering material that preserves and isolates the sensors of WBMS device is suggested in this thesis. Twenty one samples of renewably sourced Polyurethane Foam (PUF) composed of poly (trimethylene ether) glycol (PO3G) and unmodified castor oil (CO) were synthesized and evaluated according to predetermined criteria. Response surface methodology of Box – Behnken design was applied to study the effect of the following parameters (polyols ratio, isocyanate index (II), and blowing agent ratio) on the properties (hardness, density) of PUFs. Results showed that CO/PO3G/TDI PUFs with hardness Shore A 17-22 and density of 0.19-0.25 g/cm3 demonstrate the required characteristics and can potentially be used as a durable and functional insole material. Phase separation studies have found the presence of well-segregated structure in PUFs having polyols ratio CO:PO3G 1:3 and low II, which further explains their extraordinary elastic properties (400% elongation). Analysis of cushioning performance of PUF signified that 5 samples have Cushioning Energy (CE) higher than 70 N·mm and Cushioning Factor (CF) in the range of 4-8, hence are recommended for application in WBMS due to superior weight-bearing and pressure-distributing properties. Moreover, the developed formulation undergoes anaerobic soil bacterial degradation and can be categorized as “green” bio-based material.

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Section: Biodegradation Test By Soil Burial Methodsmentioning

confidence: 99%

Section: Synthesis Of Pre-polymermentioning

confidence: 99%

Novel Insole Material for Weight-Bearing Monitoring Medical Device to Be Used in Fractured Bone Clinic

Rubstova¹

2021

Preprint

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“…Tensile properties signify the durability of a sole [11]. It was believed that materials with low tensile strength and elongation may crack or break due to flexing [3].…”

Section: Physical Propertiesmentioning

confidence: 99%

“…This will affect the shape of the sole i.e. sole is worn out hence, making it uncomfortable for walking [3]. The DIN abrasion test was conducted to predict the wearing resistance of the composite which also corresponds to the life expectancy of the sole.…”

Section: Abrasion Resistancementioning

confidence: 99%

“…For instance, the use of PU as a base material for sole production may cause inhomogeneous filler distribution [2] which leads to poor physical properties. Polyester based PU has poor aging resistance due to hydrolysis which leads to embrittlement and cracking surfaces [3]. PVC and NBR have high hardness [2,4] that may result in wearing discomfort and low slip resistance.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Epoxidised Natural Rubber on the Oil Resistance Property of NBR/ENR Blends used for Safety Footwear Application

Hanif¹,

Yong²

2019

IJET

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Epoxidised natural rubber, ENR has emerged as a sustainable material for many applications due to its unique properties. This study sets out to investigate the effects of ENR on the oil resistance property of nitrile rubber, NBR composites used for safety footwear application. Blends of NBR/ENR i.e. 100/0, 90/10, 80/20, 70/30, 60/40 and 50/50 were prepared and tested for their oil resistance property and other physical properties such as hardness, tensile properties and abrasion loss. Results showed that varying the amount of ENR did not significantly affect the hardness and tensile properties of the composites. Nonetheless, it was found that ENR content highly influences the abrasion loss of the composites in which the abrasion resistance decreased with further addition of ENR contents. Despite the increase in oil swelling of the composites with increasing ENR content, the oil swelling values are considered low (< 5% volume change), indicating superior oil resistance property of the composites. These results confirm the possibility of ENR as a sustainable material for the production of eco-friendly composites with high oil resistance property for the footwear industry.

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Biodegradable waterborne polyurethane‐urea dispersion adhesives with high biocontent

Patel,

Rajput,

Hai

et al. 2023

J of Applied Polymer Sci

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Non‐biodegradable petroleum‐based plastic wastes have become a leading environmental concern, and new efforts are underway to prepare biobased and biodegradable replacements. We have explored the preparation of adhesives suitable for use in consumer products, and here we report the development of waterborne, biodegradable adhesives from biobased monomers resulting in adhesives exceeding 70% biocontent. Using water as the polymer medium, viscosity challenges and the use of volatile organic solvents are avoided. Material properties of the polyurethane dispersions, resulting films, and laminates produced showed Mw ranging between 56,000 and 124,000. Lastly, the biodegradability of films and laminates was evaluated. The resulting metrics indicate that the adhesives produced meet the desired mechanical and biodegradability targets, indicating that high renewability content solvent‐free polyurethane dispersions are a viable solution for lamination adhesives.

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Preparation and Characterization of Footwear Soling Materials Based on Biodegradable Polyurethane

Cited by 17 publications

References 21 publications

Novel Insole Material for Weight-Bearing Monitoring Medical Device to Be Used in Fractured Bone Clinic

Novel Insole Material for Weight-Bearing Monitoring Medical Device to Be Used in Fractured Bone Clinic

Effects of Epoxidised Natural Rubber on the Oil Resistance Property of NBR/ENR Blends used for Safety Footwear Application

Biodegradable waterborne polyurethane‐urea dispersion adhesives with high biocontent

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