Mechanical Properties and Atomic Force Microscopic Cross Sectional Analysis of Injection Molded Poly(ethylene terephthalate-co-4,4'-bibenzoate)

D. A. Schiraldi; Joshua J. Lee; S.A.C. Gould; M.L. Occelli

Journal of Industrial and Engineering Chemistry, Vol.7, No.2, 67-71, March, 2001

D. A. Schiraldi^†, Joshua J. Lee¹, S.A.C. Gould², and M.L. Occelli³

KoSa, P.O. Box 5750, Spartanburg SC, 29301, USA
¹Pitzer College, Claremont, CA, 91711, USA
²The Claremont Colleges, Claremont, CA 91711, USA
³MLO Consulting, 6105 Blackwater Tr., Atlanta, GA 30328, USA

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A series of poly(ethylene terephthalate-co-4,4'-bibenzoate), PETBB, copolymers were prepared using isomeric 2,4'-, 3,4'-, and 4,4'-bibenzoate monomers. Only the 4,4'-bibenzoate copolymers produced the desired, high temperature, semicrystalline materials. As a result, a PETBB copolymer containing 55 mole% 4,4'-bibenzoate was scaled up and injection molded, along with poly(ethylere terephthalate), PET, and poly(butylene terephthalate), PET, homopolymers. The PETBB copolymer was demonstrated to give shorter injection molding cycle times than PET (known for its short cycle times), and exhibited better thermal properties than either homopolymer. The PETBB copolymer exhibited 40-50% higher tensile and modulus properties when compared to PBT injection molding resin. An examination of cross-sections of the PETBB molded bars by atomic force microscopy showed these bars to be morphologically homogeneous, with no discernable surface skin effects. Details of the PETBB morphology are shown in the AFM images presented.

Keywords:Polyester;Rigid-Rod;Bibenzoate;Atomic Force Microscopy;Structure;Properties

[References]

East AJ, Golder M, Kirk-Othmer Encyclopedia of Chemical Technology, 4(th) ed, J.I. Korschwitz Ed., Vol. 19, pp. 641-647, Wiley-Interscience, New York (1999)
Lee DK, Tsai HB, J. Appl. Polym. Sci., 65(5), 893 (1997)
Jackson WJ, Morris JC, in Liquid Crystalline Polymers; ACS Symp. Ser. 453, pg. 16, American Chemical Society, Washington, D.C. (1990)
Jackson WJ, Morris JC, U.S. Patent, 4,959,450 (1988)
Jackson WJ, Morris JC, U.S. Patent, 5,011,878 (1990)
Jackson WJ, Morris JC, U.S. Patent, 5,037,946 (1990)
Krigbaum WR, Asrar J, Torkiumi H, Ciferri A, Preston J, J. Polym. Sci. C-Polym. Lett., 20, 109 (1982)
Mang MN, Brewbaker JL, U.S. Patent, 5,138,022 (1991)
Alms GR, Samuels MR, Waggomer MG, U.S. Patent, 5,250,654 (1992)
Choe EW, Flint JA, U.S. Patent, 5,453,321 (1994)
Brown DM, Clary RS, Lee CD, Monroe WG, Vaughn DA, Ragheb RT, Erter JW, Schiraldi DA, Polym. Prepr., 41(1), 123 (2000)
Tsai HB, Lee DK, Liu JL, Tsao YS, Tsai RS, J. Appl. Polym. Sci., 59(6), 1027 (1996)
Schiraldi DA, Occelli ML, Gould SAS, J. Appl. Polym. Sci., accepted for publication
Sherman SC, Iretskii AV, White MG, Schiraldi DA, Chem. Innovation, 30(7), 25 (2000)
Brown DM, Clary RS, Lee CD, Monroe WG, Vaughn DA, Ragheb RT, Erter JW, Schiraldi DA, Green Chem., submitted for publication
Occelli ML, Schiraldi DA, Gould SAC, CHEMTECH, 28(1), 35 (1998)
Gould SAC, Shulman JB, Schiraldi DA, Occelli ML, J. Appl. Polym. Sci., 74(9), 2243 (1999)
Schiraldi DA, Gould SAC, Occelli ML, J. Appl. Polym. Sci., accepted for publication
Polyakova A, Stepanov EV, SekelikD, Schiraldi DA, Hiltner A, Baer E, J. Polym. Sci. B: Polym. Phys., submitted for publication

[Referenced By]

[1] East AJ, Golder M, Kirk-Othmer Encyclopedia of Chemical Technology, 4(th) ed, J.I. Korschwitz Ed., Vol. 19, pp. 641-647, Wiley-Interscience, New York (1999)

[2] Lee DK, Tsai HB, J. Appl. Polym. Sci., 65(5), 893 (1997)

[3] Jackson WJ, Morris JC, in Liquid Crystalline Polymers; ACS Symp. Ser. 453, pg. 16, American Chemical Society, Washington, D.C. (1990)

[4] Jackson WJ, Morris JC, U.S. Patent, 4,959,450 (1988)

[5] Jackson WJ, Morris JC, U.S. Patent, 5,011,878 (1990)

[6] Jackson WJ, Morris JC, U.S. Patent, 5,037,946 (1990)

[7] Krigbaum WR, Asrar J, Torkiumi H, Ciferri A, Preston J, J. Polym. Sci. C-Polym. Lett., 20, 109 (1982)

[8] Mang MN, Brewbaker JL, U.S. Patent, 5,138,022 (1991)

[9] Alms GR, Samuels MR, Waggomer MG, U.S. Patent, 5,250,654 (1992)

[10] Choe EW, Flint JA, U.S. Patent, 5,453,321 (1994)

[11] Brown DM, Clary RS, Lee CD, Monroe WG, Vaughn DA, Ragheb RT, Erter JW, Schiraldi DA, Polym. Prepr., 41(1), 123 (2000)

[12] Tsai HB, Lee DK, Liu JL, Tsao YS, Tsai RS, J. Appl. Polym. Sci., 59(6), 1027 (1996)

[13] Schiraldi DA, Occelli ML, Gould SAS, J. Appl. Polym. Sci., accepted for publication

[14] Sherman SC, Iretskii AV, White MG, Schiraldi DA, Chem. Innovation, 30(7), 25 (2000)

[15] Brown DM, Clary RS, Lee CD, Monroe WG, Vaughn DA, Ragheb RT, Erter JW, Schiraldi DA, Green Chem., submitted for publication

[16] Occelli ML, Schiraldi DA, Gould SAC, CHEMTECH, 28(1), 35 (1998)

[17] Gould SAC, Shulman JB, Schiraldi DA, Occelli ML, J. Appl. Polym. Sci., 74(9), 2243 (1999)

[18] Schiraldi DA, Gould SAC, Occelli ML, J. Appl. Polym. Sci., accepted for publication

[19] Polyakova A, Stepanov EV, SekelikD, Schiraldi DA, Hiltner A, Baer E, J. Polym. Sci. B: Polym. Phys., submitted for publication