Tma is a kind of main raw material of fine chemicals . the plasticizer - totm that is made up of tma enjoys outstanding resistance to high temperature , cold , aging , and oil , and excellent electric insulation . totm , used as the plasticizer of pvc can greatly improve the high - , and cold - temperature performance of pvc cable , 以偏酐tma为原料生产的增塑剂偏苯三酸三辛脂totm ,具有耐热耐寒耐老化等性能，电绝缘性耐油优良，是用途广泛的pvc增塑剂，可使pvc电缆材料耐热达150 ，并在40低温下具有良好的柔软性，增加电缆在高低温下的使用寿命。
The pmma ' s craze damage is observed on line in different temperature and invariable load , which show that the change pricks up with the increase of time and temperature . with the disposal of the image , we get a changing rule that the change of the sample of pmma ' s surface crazing damage density follow the change of time and stress . then the data from experiment is to match in non - linearity , pmma ' s density of crazing damage changing with time and stress is available 对pmma在恒定荷载作用下，不同基温下的pmma银纹损伤进行了实时在线观测，结果表明： pmma试件的银纹随持荷时间增加，而且随着温度的升高，可以加剧这种银纹随时间的变化；经图像处理，得到了不同基温下、不同应力水平下， pmma试件银纹损伤面密度值；进而，对所得数据进行非线性拟合，得到pmma试件银纹损伤密度随时间演化规律，以及应力水平依赖性； 3
