Soft segment 88-series adhesives

Figure L The low-temperature dynamic mechanical spectrum of Halthane 73-14 is typical of the 73-series polyurethane adhesives. Two secondary relaxations, Tp and Ty, are shown as peaks in the loss modulus at —100° and —150°C. The soft segment glass transition, Tg(SS), occurs at about —50°C. The frequency of oscillation was held constant during the measurement at 0.1 Hz.

C)8 Pa as compared to 10 Pa) over the temperature range between hard and soft segment glass transitions. Table IV lists the transition temperatures for 87- and 88-series adhesives. 

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