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- W1786324593 abstract "Dynamic mechanical measurements of polyimide (PI) and polyamideimide (PAI) films are carried out using a dynamic viscoelastometer in the temperature range from −150 to 250°C. Two relaxations were observed in each polymer at 3.5 Hz. One of them occurs at −107°C (PI) and −80°C (PAI) and is attributed to the water bound to the carbonyl group. The location of the maxima and their activation energies are related to the water content. The other relaxation, due to coupled oscillations of p-phenylene rings, takes place at 80°C (PI) and 46°C (PAI). Their different activation energies are explained in connection with the structure of each polymer. Dynamisch-mechanische Messungen an Polyimid-(PI) und Polyamidimid-Filmen (PAI) wurden unter Verwendung eines dynamischen Viskoelastometers im Temperaturbereich von −150 bis 250°C durchgeführt. Zwei Relaxationen wurden in jedem Polymeren bei 3, 5 Hz beobachtet. Eine tritt bei −107°C(PI) bzw. −80°C(PAI) auf und wird durch Wasser, das an die Carbonylgruppe gebunden ist, verursacht. Die Lage der Maxima und die Aktivierungsenergien hängen vom Wassergehalt ab. Die andere Relaxation, verursacht von gekoppelten Schwingungen der Phenylenringe, tritt bei 80°C (PI) bzw. 46°C (PAI) auf. Ihre verschiedenen Aktivierungsenergien werden aus der unterschiedlichen Struktur der Polymeren verständlich." @default.
- W1786324593 created "2016-06-24" @default.
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- W1786324593 date "1982-07-15" @default.
- W1786324593 modified "2023-09-29" @default.
- W1786324593 doi "https://doi.org/10.1002/apmc.1982.051060105" @default.
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