An open letter from Vin Lananna. Thank you to the citizens of Portland and Oregon for welcoming over 500 track and field athletes from 144 countries to our city, our state and our country to experience the sport at its absolute best during the 2016 IAAF World Indoor Championships.
Rochester Public Utilities (RPU) is a municipally-owned electric and water utility located in Rochester, MN. RPU serves more than 50,000 electric customers and 39,000 water customers. RPU operates under the direction of a five member, mayor-appointed Utility Board and under the Rochester City Council.
A TPU is a multi-phase block copolymer that is created when three basic raw materials are com-bined together in a specificway. The individual components required to produce a TPU are:â¢ A polyol or long-chain diolâ¢ A chain extender or short-chain diolâ¢ A diisocyanate Figure 1.0 depicts the basic chemistry of TPU. The soft block, built out of a polyol and an isocyanate, is responsible for the flexibilityand elastomeric character of a TPU. The hard block, constructed from a chain extender and isocyanate, gives a TPU its toughness and physical performance properties. 6 2. TPU chemistry Figure 2.0 highlights the cross-linking structure of a thermoplastic elastomer versus a thermoset rubber.