Weekly topic: 5 Wealth points for correct answers, 2 Wealth points for participation； Question 132
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Short answer: At what temperature should the polymer be stretched in order to obtain an oriented structure through stretching during processing? Answer: It should be between the glass transition temperature and the melting point of the polymer, because molecules only have sufficient mobility above Tg; this allows them, under tensile stress, to be pulled apart from random coils, straightened out, and to move relative to one another.
It should be done between the glass transition temperature and the melting point of the polymer, as molecules only possess sufficient mobility above Tg; this allows them, under tensile stress, to be pulled apart from their random coils, straightened out, and to move relative to one another.
At what temperature should the polymer be stretched to obtain an oriented structure during processing? It should be between the glass transition temperature and the melting point of the polymer, because molecules only have sufficient mobility above Tg; this allows them, under tensile stress, to be pulled apart from random coils, straightened out, and to move relative to one another.
Viscoplastic stretching: The condition is T > Tf; due to the high temperature, the alignment is rapid, resulting in a low effective degree of alignment； Also, due to the high temperature and low viscosity, it is easy for the liquid flow to be interrupted. Therefore, within this range, the stretching must be constant, with no pauses. This kind of stretching mainly occurs during spinning. Plastic stretching: the condition is Tg
Answer: It should be between the glass transition temperature and the melting point of the polymer, because molecules only have sufficient mobility at temperatures above the glass transition temperature; this allows them, under tensile stress, to be pulled apart from their entangled states, straightened out, and to move relative to one another.
It should be between the polymer’s glass transition temperature and melting point. Because molecules only possess sufficient mobility at temperatures above the glass transition temperature; thus, under tensile stress, they can be pulled apart from their disordered clusters, straightened out, and move relative to one another.
Answer: It should be between the glass transition temperature and the melting point of the polymer, because molecules only have sufficient mobility above Tg; this allows them, under tensile stress, to be pulled apart from random coils, straightened out, and to move relative to one another.
It should be between the glass transition temperature and the melting point of the polymer, because molecules only have sufficient mobility above Tg; this allows them, under tensile stress, to be pulled apart from random coils, straightened out, and to move relative to one another.
It should be done between the glass transition temperature and the melting point of the polymer, as molecules only possess sufficient mobility above Tg; this allows them, under tensile stress, to be pulled apart from their random coils, straightened out, and to move relative to one another.
It should be done between the glass transition temperature and the melting point of the polymer, as molecules only possess sufficient mobility above Tg; this allows them, under tensile stress, to be pulled apart from their random coils, straightened out, and to move relative to one another.