Viscometric Study of Poly(ester Urethane) Solutions: 2. Influence of Hard-Segment Composition on the Unperturbed Dimensions

Abstract

Using viscometry, we have studied the dilute solution property of segmented poly(ester urethane)s obtained by the reaction of aromatic diisocyanates with poly(ethylene glycol)adipate and 4,4′-dihidroxydiethoxydiphenyl sulphone as chain extender, using a multistep polyaddition process. A new method proposed by Qian et al. was utilized for the determination of unperturbed dimensions of poly(ester urethane)s having different hard segments by the measurement of the intrinsic viscosity at non-theta conditions only. The influence of the hard segments on the unperturbed dimensions of these polymers was observed. The diisocyanates with methyl substituents in the hard segments, such as 2,4-tolylene diisocyanate, have smaller unperturbed dimensions compared with the samples containing 4,4′-methylene diphenylene diisocyanate, which are believed to possess significant chain rigidity because of the high cohesive energy and bulkiness of the benzene ring.

Keywords

Segmented poly(ester urethane)s intrinsic viscosity unperturbed dimensions

Get full access to this article

View all access options for this article.

References

1 Yamazaki E , Hanahata H , Hiwabari J and Kitahama Y 1997 Polym. J. 29 811

2 Speckhard T and Cooper S L 1986 Rubber. Chem. Technol. 59 405

3 Koberstein J T and Russel T P 1986 Macromolecules 19 149

4 Lee H S , Wang Y K and Hsu S L 1987 Macromolecules 20 2089

5 Heuse C W , Yang X , Yang D and Hsu S L 1992 Macromolecules 25 925

6 Lelah M D and Cooper S L 1996 Polyurethanes in Medicine ( Boca Raton, FL: CRC Press )

7 Wang T L and Hsiech T H 1996 Polym. J. 28 839

8 Grigoriu A , Macocinschi D , Filip D and Vlad S 2001 Bul. Inst. Polit. Iasi VIII 1-2 109

9 Grigoriu A , Macocinschi D , Filip D and Vlad S 2001 Rev. Rom. Text. 1-2 325

10.

10 Petrovic Z S and Ferguson J 1991 Prog. Polym. Sci. 16 695

11.

11 Ioan S , Grigorescu G and Stanciu A 2000 J. Opt. Adv. Mat. 2 397

12.

12 Ioan S , Grigorescu G and Stanciu A 2002 Int. J. Polym. Anal. Characterization 7 221

13.

13 Ioan S , Grigorescu G and Stanciu A 2000 Polymer 42 3633

14.

14 Ioan S , Grigorescu G and Stanciu A 2002 Eur. Polym. J. 38 2295

15.

15 Einstein A 1911 Ann. Phys. 34 519

16.

16 Qian J W , Wang M , Han D L and Cheng R S 2001 Eur. Polym. J. 37 1403

17.

17 Macocinschi D , Grigoriu A and Filip D 2002 Eur. Polym. J. 38 1025

18.

18 Hanahata H , Yamazaki E and Kitahama Y 1997 Polym. J. 29 818

19.

19 Ioan S , Taranu A and Macocinschi D Eur. Polym. J. in press

20.

20 Qian J W and Rudin A 1992 Eur. Polym. J. 28 773

21.

21 Simek L , Tuzar Z and Bohdanecky M 1980 Makromol. Chem. Rapid. Commun. 1 215

22.

22 Tsitsilianis C , Staikos G and Dondos A 1990 Makromol. Chem. 191 2309

23.

23 Dondos A and Papanagopoulos D 1996 J. Polym. Sci. Polym. Phys. 32 1281