Polymer morphology: the arrangement of
polymer molecules.
− Thermoplastics have either amorphous or
semi-crystalline structures.
• Amorphous thermoplastics
consist of amorphous region with
randomly arranged polymer
chains. Amorphous polymers are
softer, have lower melting points,
and are penetrated more by
solvents than are their crystalline
counterparts.
• Semi-crystallinity is a desirable
property for most plastics
because they combine the
strength of crystalline polymers
with the flexibility of amorphous.
Semi-crystalline polymers can be
tough with an ability to bend
without breaking.
• The so-called semi-crystalline plastics include
polyethylene, polypropylene, poly (vinyl chloride),
polyamides (nylons), polyesters and some
polyurethanes.
Polymer morphology: the arrangement ofpolymer molecules.− Thermoplastics have either amorphous or semi-crystalline structures.• Amorphous thermoplastics consist of amorphous region with randomly arranged polymer chains. Amorphous polymers are softer, have lower melting points, and are penetrated more by solvents than are their crystalline counterparts.• Semi-crystallinity is a desirable property for most plastics because they combine the strength of crystalline polymers with the flexibility of amorphous. Semi-crystalline polymers can be tough with an ability to bend without breaking.• The so-called semi-crystalline plastics include polyethylene, polypropylene, poly (vinyl chloride), polyamides (nylons), polyesters and some polyurethanes.
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