Glass transition temperature goes up with the hard segment content increase. Heathistory affect on glass transition of polymers apparently.
受热史对聚合物的玻璃化温度有较大的影响，随着硬段含量的增加而变大。
2
In a system operated five days a week, small amounts of residual material in the extrusion system acquire substantial heathistory as the machine slowly cools and starts up again.
The Russian heat wave of 2010 is now estimated by the Centre for Research on the Epidemiology of Disasters to be the deadliest in human history, with 55, 736 deaths.