Liquid Crystalline Polymers: 2. Synthesis and Thermotropic Studies of Poly(Arylidene-Ether)s Containing a Cyclopentanone Moiety in the Main Chain

Abstract

A novel series of poly(arylidene-ether)s containing cyclopentanone was synthesized by polycondensation of 4, 4′-diformyl-α, ω-diphenoxyalkane and 4, 4′-diformyl-2, 2′-dimethoxy-α, ω-diphenoxyalkane with cyclopentanone. The polymers were characterized by elemental and spectral analyses, inherent viscosity, solubility and thermal analyses. Their thermotropic liquid crystalline properties were examined by DSC, optical polarizing microscopy using a heated stage and thermogravimetric analyses. Almost all the polymers exhibited thermotropic liquid crystalline properties. In most cases the mesophase extends up to 358°C, where thermal decomposition prevents further observations. In addition, the crystallinity of some polymers was examined by x-ray analysis; all showed some degree of crystallinity. The morphology of one polymer was examined by scanning electron microscopy (SEM).

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References

[1] Chapoy L L (ed) 1986 Recent Advances in Liquid Crystalline Polymers (London: Elsevier)

[2] Blumstein A (ed) 1985 Polymeric Liquid Crystals (New York: Plenum)

[3] Griffin A G and Johnson J F (ed) 1984 Liquid Crystals and Ordered Fluids (New York: Plenum)

[4] Jackson W J Jr 1989 Mol. Liq. Cryst. 169 23-23

[5] Griffen A C and Haren S J 1986 J. Polym. Sci. - Polym. Phys. 19 951-951

[6] Angeloni A S , Laus M , Burgin E , Galli G and Chiellini E 1985 Polym. Bull. 13 131-131

[7] Shaffer T D and Percec V 1985 Polym. Bull. 14 367-367

[8] Shaffer T D and Percec V 1986 Makromol. Chem. 187 1431-1431

[9] Tanaka M and Nakaya T 1986 Makromol. Chem. 187 2345-2345

10.

[10] Mahabad H-K and Alexandru L 1985 US Patent 4543 313 (to Xerox Corp.)

11.

[11] Jackson W J Jr and Kuhfuss H F 1980 US Patent 4182-4182 842-842 (Eastman Kodak Co.)

12.

[12] Aly K I 1998 Polym. Int. 47 483-483

13.

[13] Aly K I 1998 High Perform. Polym. 10 353-353

14.

[14] Aly K I 1994 High Perform. Polym. 6 149-149

15.

[15] Aly K I and Abd-Alla M A 1992 Polym. J. (Japan) 24 164-164

16.

[16] Abd-Alla M A and Aly K I 1991 J. Macromol. Sci-Chem. A28 251-251

17.

[17] Perrin D D , Armarego W L F and Perrin D R 1980 Purification of Laboratory Chemicals 2nd edn (New York: Pergamon)

18.

[18] Aly K I 1999 J. Appl. Polym. Sci. 74 2369–2377

19.

[19] Aly K I and Khalaf A A 1999 J. Appl. Polym. Sci. accepted

20.

[20] Abd-Alla M A , El-Zohary M F and Osman M A 1991 Polym. Bull. 25 287-287

21.

[21] Mandelkern L 1964 Crystallization of Polymers (New York: McGraw-Hill)

22.

[22] Tager A 1972 Physical Chemistry of Polymers (Moscow: Mir)

23.

[23] Antoun S , Lenz R W and Jin J-I 1981 J. Polym. Sci., Polym. Chem. Ed. 19 1901-1901

24.

[24] Roviello A and Sirigu A 1979 Makromol. Chem. 180 2543-2543

25.

[25] Morgan P W , Kwolek S L and Pletcher T C 1987 Macromolecules 20 729-729

26.

[26] Economy J , Volsken W , Viney C , Geiss R , Seimens R and Karis T 1988 Macromolecules 21 2777-2777

27.

[27] Kyotani M and Kanetsuna H 1983 J. Polym. Sci., Polym. Chem. Ed. 20 379-379

28.

[28] Kotex R and Krigbaum R W 1988 J. Polym. Sci., Polym. Phys. Ed. 26 1173-1173

29.

[29] Li C H and Chang T C 1991 Eur. Polym. J. 27 35-35

30.

[30] Ozcayir Y and Blumstein A 1986 J. Polym. Sci. Polym. Chem. Ed. 24 1217-1217

31.

[31] Ober Ch K , Jin J I and Lenz R W 1984 Liquid Crystal Polymers vol I (Berlin: Springer) p 103-103

32.

[32] Liang A L , Hsu K Y , Li C H and Chang T C 1992 Polymer 33 2217-2217

33.

[33] Liang A L , Hsu K Y and Chang T C 1992 Eur. Polym. J. 28 783-783