Physics, 10.07.2019 23:40, Goldenstate32
Asample of poly(1,4-phenylene sulphide) (pps) is known to have a glass transition tem- perature of 89°c, a cold-crystallization temperature of 137°c and a melting temperature of 278°c. sketch the heat-flux differential scanning calorimetry (dsc) trace you would expect to observe on heating a completely amorphous specimen of this pps from 25°c-325°c labelling the axes and each of the thermal events you show. a sample of this pps (15.3 mg) that had been annealed at 150°c for 1 h was analysed by dsc using a heating rate of 20°c min and the area of the melting endotherm found to be 192.55 mw k. melting of indium (23.2 mg) was used for calibration and gave a melting endotherm of area 216.87 mw k on heating at 20°c min. given that the enthalpy for melting of indium is 28.6 j g and that the enthalpy of melting for 100% crystalline pps is 55.9 j g, calculate (a) the dsc instrument calibration factor, kpsc (b) the enthalpy of melting and degree of crystallinity of the annealed sample of pss a 1 n- he
Answers: 2
Physics, 22.06.2019 07:20, raemyiajackson1
Use the information presented in the graph to answer the questions. which segments show acceleration? which segment indicates that the object is slowing down? what is the velocity of segment b? what is the acceleration of segment b?
Answers: 3
Physics, 22.06.2019 09:40, dakshshberry
Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?
Answers: 2
Asample of poly(1,4-phenylene sulphide) (pps) is known to have a glass transition tem- perature of 8...
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