4. Which one, HDPE or LDPE, is more amorphous?
5. Are polymer crystals more regular than the low molecular weight ones?
12. Передайте основное содержание текстов урока на русском и английском языках.
Unit 4
PHASE BEHAVIOR OF POLYMERS
1. Прочитайте текст вслух.
Consider a polymer which is slowly cooling down. At a certain temperature, the average kinetic energy of macromolecules no longer exceeds the binding energy between neighbouring molecules and the growth of organized solid crystal begins. Formation of an ordered system takes a certain amount of time since the molecules must move from their current location to energetically preferred points at crystal nodes.
Конец ознакомительного фрагмента.