The effect of polymer hardness, pore size, and porosity on the performance of thermoplastic polyurethane-based chemical mechanical polishing pads

Abstract

Abstract

A new approach to the structure–properties relationship evaluation for porous polymer composites

“…Drozdov and Christiansend reported the decrease of Young's modulus with the increasing extent of porosity for different thermoplastic foams [19]. The similar relation between porosity and hardness of thermoplastic polyurethanes was evidenced by Prasad et al [20].…”

“…Accordance results between real data and data calculated by Eqs (18)(19)(20)(21). Slopes values belong to linear functions going throw beginning and containing dependences of real data on those calculated.…”

“…The determination of mechanical properties of individual components of prepared composites is important for the evaluation of composites behaviour as well as structural parameters as mentioned above. Therefore the pure PUR matrices without GR were prepared in the 20 20-80 20-90 20-90 P 85 -G 5 -CO 10 20-90 20-90 20-90 P 65 -C 35 20-90 20-90 20-90 P 49 -CO 26 -LO 25 20-90 20-90 20-90 P 33 -CO 17 first phase whereas their composition was designed in order to achieve different mechanical properties and different bulk porosity. Values of mechanical properties, porosity and density of PUR matrices are listed in Table 3.…”

Preparation of fluorescent thermoplastic polyurethane microcellular foam films blown by supercritical CO2

“…The physical blowing agent, i.e., the compressed CO 2 , used in TPU microcellular foaming exhibits a high gas diffusion rate, and the saturated gas at surface will diffuse out of sample's surface, which will restrain cell nucleation and cell growth, and then leads to the formation of unfoamed skin. 41 During the solid-state foaming process, by controlling the desorption time, which is the time gap between the vessel pressure releasing and the water heating of the saturated sample, the thickness of the unfoamed skin can be adjusted. Figure 11 shows the images of TPU/ FP0.5 foams under sunlight and UV light; the foams were prepared by changing the desorption time from 0.2 to 15 min.…”

Microscopic morphology, thermodynamic and mechanical properties of thermoplastic polyurethane fabricated by selective laser sintering

“…Thermoplastic polyurethanes (TPU) has been widely used in daily life (e.g., apparel accessories, footwear, toy models), industrial supplies (e.g., cable and wire, bearing, hose, and tube), and medical supplies (e.g. medical instrument cables, healthcare mattresses, and compression stockings) because of its excellent properties such as high elasticity, high energy absorption capability, prominent abrasion resistance, flame retardancy, and tearing resistance [1][2][3][4][5][6]. The commercial TPU products are manufactured according to the standard specifications by conventional systems, for instance, injection moulding, extrusion and blow moulding [1,2,7,8].…”