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  • Open Access

    ARTICLE

    Studies on Compressive Loading-characteristics of PU Foam Materials Used in Footwear for Obese

    S. MATHIVANAN*, R. MOHAN, RAMES C PANDA, P. BALACHANDER1

    Journal of Polymer Materials, Vol.39, No.3-4, pp. 195-204, 2022, DOI:10.32381/JPM.2022.39.3-4.2

    Abstract Optimum-designed footwear with polyurethane (PU) material for comfort is an important requirement for obese. Investigations on compressive behavior of varied designed footwear using 120 D PU material have been carried out. The energy absorption primarily depends on heel height, slope angle and load applied or body mass index of obese. Statistical analysis has been used to formulate the prediction of absorbed energy wherein a heel height of 30 mm with 20-degree angle provides optimum value with the incorporation of 120 D PU material. A coefficientof-determination (R2 ) value of 0.9406 confirms the suitability of the statistical regression model. Hence, the… More >

  • Open Access

    ARTICLE

    Effects of Forefoot Shoe on Knee and Ankle Loading during Running in Male Recreational Runners

    Jingying Lu1, Datao Xu1, Wenjing Quan1,2, Julien S. Baker3, Yaodong Gu1,*

    Molecular & Cellular Biomechanics, Vol.19, No.2, pp. 61-75, 2022, DOI:10.32604/mcb.2022.019978

    Abstract Objectives: Although overuse running injury risks for the ankle and knee are high, the effect of different shoe designs on Achilles tendon force (ATF) and Patellofemoral joint contact force (PTF) loading rates are unclear. Therefore, the primary objective of this study was to compare the ATF at the ankle and the PTF and Patellofemoral joint stress force (PP) at the knee using different running shoe designs (forefoot shoes vs. normal shoes). Methods: Fourteen healthy recreational male runners were recruited to run over a force plate under two shoe conditions (forefoot shoes vs. normal shoes). Sagittal plane ankle and knee kinematics… More >

  • Open Access

    ARTICLE

    Biobased Additives as Biodegradability Enhancers with Application in TPU-Based Footwear Components

    Isabel Patrícia Fernandes1, Mariana Barbosa1, Joana Soares Amaral2, Vera Pinto3, José Luís Rodrigues3, Maria José Ferreira3, Maria Filomena Barreiro1*

    Journal of Renewable Materials, Vol.4, No.1, pp. 47-56, 2016, DOI:10.7569/JRM.2015.634126

    Abstract Among the wide variety of materials employed in the manufacture of shoes, thermoplastic polyurethanes (TPUs) are one of the most widely used. Given its widespread use, and associated waste management problems, the development of more biodegradable and evironmentally compatible solutions is needed. In this work, a polyester-based TPU used in the footwear industry for outsoles production was modifi ed by compounding with lignin, starch and cellulose at content of 4% (w/w). The biodegradability was evaluated by using agar plate tests with the fungi Aspergillus niger ATCC16404, the Gram-negative bacteria Pseudomonas aeruginosa ATCC9027 and an association of both (consortium), and soil… More >

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