课件高分子选论浙大非平衡缩聚.pdfVIP

Non-EquilibriumPolycondensation

1Introduction

1.Classificationofpolycondensation

1.Bythekindsofmonomer

1)homopolycondensation

HNRCOOH

2

-aminoacid

2)heteropolycondensation

HNRNH+HOOCRCOOH

22

diaminediacid

3)copolycondensation

HNRCOOH+HNRCOOH

22

HNRNH+HNRNH+HOOCRCOOH

2222

1.1.2Bythestructureofpolymer

1)linearpolycondensation

2-system,2-2system

2)network(threedimensional)polycondensation

2-3or2-4system

1.1.3Bythetypesofthefunctionalgroup

polyesterification-COO-

polyamidation-CONH-

polyetherification-O-

polyurethanation-OCONH-

1.1.4Bythethermodynamiccharacteristicsofreaction

k1

na-A-a+nb-B-bk2a[AB]b+(n-1)ab

n

equilibriumpolycondensation(reversible)

degradationorereaction

K=k/ksmall

12

non-equilibriumpolycondensation(irreversible)

nodegradationorereaction

K103

ex.Kevlar,poly(p-phenyleneterephthalamide)

nClOC--COCl+nHN--NH

22

terephthaloylchloridep-phenylenediamine

[NH--NH-CO--CO]+2nHCl

n

1.2Factorscausingnon-equilibriumpolycondensation

1)chemicalfactors

*highly-activ