5-1《材料导论I》

an amorphous (disorderly) structure. arrangement of an amorphous polymer

polymers are semicrystalline in varying degrees

other polymers may have a high degree of the amorphous

structured polymers

Oriented polymer fibers are obtained by

drawing an amorphous polymer through a

die,which improves their strengths or

P232 7para

The cross-linked network polymers do not linear chains

•the branched polymers are not as symmetrical and

consequently will not achieve the degree of

Heating of thermoplastics causes these weaker

bonds to lose their hold, and thus movement of the