China 
Africa 
Explore chapters and articles related to this topic
Development and Mechanical Characterization of Coir Fiber-Based Thermoplastic Polyurethane Composite
Published in Atul Babbar, Ranvijay Kumar, Vikas Dhawan, Nishant Ranjan, Ankit Sharma, Additive Manufacturing of Polymers for Tissue Engineering, 2023
Jaspreet Kaur, Dharmpal Deepak, Harnam Singh Farwaha, Sulakshna Dwivedi, Nishant Ranjan
Thermoplastic polyurethane (TPU) is one of the course groups of polyurethane plastics with various properties, such as transparency, elasticity and resistance oil and abrasion, and grease (Behniafar and Azadeh, 2015). Scientifically, thermoplastic elastomers contain linear segmented block copolymers poised of soft and hard segments (Yuan et al., 2019). This is partly because TPU is a linear segment block polymer composed of smooth and complex components. Its hard element can either be aromatic or aliphatic (Mi et al., 2017). Aromatic TPUs are based on isocyanates like methylene diphenyl diisocyanate (MDI), whereas aliphatic TPUs are based on isocyanates like H 12 MDI. When these isocyanates are combined with short-chain diols, they become the hard block. Generally, it is aromatic, but retention in sunlight exposure is a priority by color and clarity, an aliphatic hard segment is often used (Gryshchuk, 2005).
Gamma Radiation Studies on Thermoplastic Polyurethane/Nanosilica Composites
Published in Shakeel Ahmed, Saiqa Ikram, Suvardhan Kanchi, Krishna Bisetty, Biocomposites, 2018
V.K. Abitha, Rane Ajay Vasudeo, Krishnan Kanny, Sabu Thomas, M.R. Niji, K. Rajkumar
Thermoplastic polyurethane (TPU) provides opportunities to the modern industry by its outstanding versatility, by improving the performance of any product from shoe soles to seals, films, conveyor belts, and cables. TPUs have high elongation and tensile strength, elasticity, and ability to resist oils, greases, solvents, chemicals, and abrasion. TPUs are classified as polyether-based and polyester- based, and they have the following characteristics within them. Polyester TPUs are unaffected by oils and chemicals, provide excellent abrasion resistance, offer a good balance of physical properties, and are perfect for use in polyblends. On the other hand, polyester TPUs are slightly lower in specific gravity than polyester TPUs and offer low temperature flexibility, good abrasion and tear resilience. They are also durable against microbial attack and provide excellent hydrolysis resistance, making them suitable for applications where water is a consideration. The mentioned work deals with preparation of composites based on TPU (polyester) and nanosilica via melt-blending process in a laboratory mixer. The prepared nanocomposites were tested for mechanical/thermal/electrical properties, and also irradiation properties were determined.
3D Printed structures for nanoscale research
Published in Adedeji B. Badiru, Vhance V. Valencia, David Liu, Additive Manufacturing Handbook, 2017
If we consider the most inexpensive and readily available 3D-printing processes, plastic is a common material to use. With a variety of manufacturers now producing 3D printers, the printers currently available typically have the ability to use one or two kinds of plastics—PLA and ABS. A third type, TPU is a more recent addition to this list and is slowly working its way into use. These are all polymers, and the exact material properties of any given type will vary depending on the manufacturer and method of fabrication. For example, one prototyping company currently offers five different types of ABS alone. In general however: Polylactic acid (PLA)—This is the most rigid of the three materials and typically more prone to fracturing rather than plastic deformation when under load. This material also generally exhibits less change in dimensions during printing, making PLA more suitable for size-critical applications (gears, enclosures, circuit mounting, etc.) This material is also biodegradable and thus is used in plastic drinking cups and fibers used in teabags and diapers [16,17].Acrylonitrile butadiene styrene (ABS)—This plastic is typically softer than PLA, exhibiting more flexibility under stress and leading to more plastic deformation before breaking. This material tends to have more variability in its material properties when manufactured and deposited but typically is easier to process. As it has a slightly lower melting point than PLA, it is slower to cool, and thus it remains more pliable during the cooling process. This characteristic makes it a more common choice for injection molding and is commonly used in consumer products such as toys, kitchen appliances, and so on, where durability, strength, and flexibility are more critical than precise mechanical dimensions [18,19].Thermoplastic polyurethane elastomers (TPU)—This most recent addition to the list of printable plastics is being marketed as a flexible printing material, with a consistency very similar to rubber. It is highly durable and resistant to a moderate range of temperatures. While it is suitable for applications like gaskets and tubing, it is already in use in textiles and clothing (clothing, shoes, handbags, etc.) [20,21].
Study on 3D printed auxetic structure-based non-pneumatic tyres (NPT’S)
Published in Materials and Manufacturing Processes, 2022
Narasimhulu Andriya, Varnali Dutta, Vemula Vijaya Vani
TPU – Various companies are using Polyurethanes for airless tyre prototype production because of their reasonable structural properties. TPU (Thermoplastic Polyurethane) is a subset of polyurethane polymers that have desired flexibility, transparency, non-toxicity, and oil/grease abrasion resistance (refer Table 1). They are truly flexible in nature and useful in printing objects which undergo a lot of bending, stretching, and compression, and wear in general.
Study on structure and property of PP/TPU melt-blown nonwovens
Published in The Journal of The Textile Institute, 2019
Mengna Peng, Huiying Jia, Liang Jiang, Yanfen Zhou, Jianwei Ma
Thermoplastic polyurethane (TPU) is an excellent thermoplastic block linear copolymer with tensile strength up to 50 MPa and elongation at break of above 500%, which makes it to be a good candidate for producing elastic fabrics (Cheng, Jiao, & Kang, 2006; Frick & Rochman, 2004; Lambertz et al., 2016). Thermoplastic polyurethane (TPU) melt-blown nonwovens have also been developed. It was proved that TPU elastic melt-blown nonwovens have good air permeability (U.S. Patent No. 538, 5775, 1991). Minnesota Mining and Manufacturing has produced many elastic melt-blown nonwovens using elastomer materials, of which TPU melt-blown nonwovens have the best performance (U.S. Patent No. 495, 7795, 1990). In Japan, Kanebo Co., Ltd, Asahi Chemical Co., Ltd and Kuraray Co., Ltd has produced high value-added melt-blown nonwovens, of which Kanebo Co., Ltd Using TPU to prepare thick melt-blown nonwovens known as Espansione, the fiber diameter of 20–40 μm, good elasticity and good air permeability, used as medical bandages and other medical materials (Kin, 1996). Kanebo Co., Ltd has produced work gloves with high heat resistance, dirt resistance, and smooth surface, using two TPU melt-blown nonwovens stacking together. TPU melt-blown nonwovens made by the Tennessee University of USA were used for military defense linings. The Donghua University of China blended TPU and PP pellets to produce micro-nanofibers with helical structure using as oil absorb materials, which had small fiber diameter, large specific surface area, and high porosity. However, although melt spinning technology of TPU has been industrialized so far, high melt viscosity and poor flowability afflict it to be melt-blown independently (Safranski et al., 2016). Blending provides the feasibility not only for obtaining polymer materials with excellent properties, but also for improving their processing capability and reducing the product cost (Hui et al., 2014). Based on this, the fabrication of PP/TPU hybrid melt-blown nonwovens were studied in this work. Meanwhile, the structure and property of the obtained nonwovens were investigated. Particularly, elastic recovery of the melt-blown nonwovens was addressed.