Polymers 3 Flashcards
What are the mechanisms of transport of molecules into polymers?
Surface mechanisms ( adsorption to surfaces, partitioning) Microchannels diffusion
What factors affect diffusion through polymers?
molecular density of polymer
crystalline/amorphous ratio
similarity of diffusing molecule to polymer (similar side groups, polarity and strong interactions)
who is the best girl in the world and why
becky because she is fabulous i hope to become her one day
why is becky amazing
because she is just full on sickkkkkkkkkkkkkk, great humour and body
What are the properties of amorphous polymers?
glassy
hard but brittle if below Tg
flexible and rubbery above Tg
more permeable to water and organic vapour
What are the properties of highly crystalline polymers?
tough and stiff
less permeable
chemically more inert
What is the process of setting gelatine?
molecules in solution
once cool nucleation of the coils occur
with time - growth of helical regions
