A series of different urethane/urea polyester polyurethanes (polyester-PU) with various diols were synthesized by poly(2-methyl-2

4-pentadiol adipate) diol as soft segment

2

4-2

6 mixed toluene diisocyanate (TDI T-80)

isophorone diamine (IPDA)

glycol (EG)

1

2-propylene glycol (PG)

1

4-butanediol (BDO) and neopentyl glycol as hard segment.Fourier transform infrared (FTIR) spectroscopy was used to investigate the effect of ester carbonyl

carbamate/urea linkages

and mixed toluene diisocyanate structures on carbonyl hydrogen bonding under the constant total hard segment content. The results showed that in the role of polyester polyol ester carbonyl group

there are six absorption peaks in the infrared spectra of urethane carbonyl and ester carbonyl region of polyester polyurethane resin. —C=O

int

not formed hydrogen bonds

and —C=O

ext

part formed hydrogen bonds

the degree of —C=O

ext

hydrogen bond increases from 5% to 9% with the increase of the chain extension ratio of small molecule diol. When the hard segment content of polyester polyurethane resin was about 20%

free urethane carbonyl and ester carbonyl were mainly 60%.With the increase of urethane/urea

under the combined influence of the asymmetric structure of 2

4-TDI

the degree of H-bonded urethane carbonyl and urea carbonyl in the polyester-PU decreased

free urethane carbonyl

ester carbonyl and urea carbonyl increased

which indicated that the microphase seperation of the polyester-PU was weakened

the mixing of soft and hard segments was enhanced. The degree of H-bonded urea carbonyl overall was a small proportion 6%.

P

was 0.25

the degree of H-bonded urethane carbonyl in P-PU was larger

and then decreased.