Dynamic mechanical thermal analysis (DMTA) of virgin TR-55 silicone rubber specimens was conducted. Two dynamic temperature sweep tests, 25 to -100 C and 25 to -70 to 0 C (ramp rate = 1 C/min), were conducted at a frequency of 6.28 rad/s (1 Hz) using a torsion rectangular test geometry. A strain of 0.1% was used, which was near the upper limit of the linear viscoelastic region of the material based on an initial dynamic strain sweep test. Storage (G{prime}) and loss (G{double_prime}) moduli, the ratio G{double_prime}/G{prime} (tan {delta}), and the coefficient of linear thermal expansion ({alpha}) were determined as a function of temperature. Crystallization occurred between -40 and -60 C, with G{prime} increasing from {approx}6 x 10{sup 6} to {approx}4 x 10{sup 8} Pa. The value of {alpha} was fairly constant before ({approx}4 x 10{sup -4} mm/mm- C) and after ({approx}3 x 10{sup -4} mm/mm- C) the transition, and peaked during the transition ({approx}3 x 10{sup -3} mm/mm- C). Melting occurred around -30 C upon heating.

Iraq has largely completed a formal political transition from the dictatorship of Saddam Hussein to a plural policy that encompasses varying sects and political factions. However, grievances and disputes among these groups remain over the relative claim of each on power and economic resources. These disputes permeate and complicate almost every issue in Iraq, including security, the terms and framework for elections, economic design making, and foreign policy.

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Newsletter published by the Texas State Office of Risk Management discussing news, events, and activities of the agency as well as other topics related to risk management for state employees. This issue includes information about driving safety, online training, Article VII agencies profiling, and SIF reimbursements.

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