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2. Thermoplastic - Wikipedia

   en.wikipedia.org/wiki/Thermoplastic

   Polyphenylene oxide (PPO), which is obtained from the free-radical, step-growth oxidative coupling polymerization of 2,6-xylenol, has many attractive properties such as high heat distortion and impact strength, chemical stability to mineral and organic acids, and low water absorption. PPO is difficult to process, and hence the commercial resin ...

3. Thermosetting polymer - Wikipedia

   en.wikipedia.org/wiki/Thermosetting_polymer

   Left: individual linear polymer chains Right: Polymer chains which have been cross linked to give a rigid 3D thermoset polymer. In materials science, a thermosetting polymer, often called a thermoset, is a polymer that is obtained by irreversibly hardening ("curing") a soft solid or viscous liquid prepolymer (). [1]

4. Diabetic shoe - Wikipedia

   en.wikipedia.org/wiki/Diabetic_shoe

   Many diabetic shoes have velcro closures for ease of application and removal. Diabetic shoes (sometimes referred to as extra depth, therapeutic shoes or sugar shoes) are specially designed shoes, or shoe inserts, intended to reduce the risk of skin breakdown in diabetics with existing foot disease and relieve pressure to prevent diabetic foot ulcers.