JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.101 P.330-334

http://doi.org/10.1631/jzus.2006.AS0330

Additive effects of N,N,N′,N′-tetraalkyl terephthalamide on crystalline morphology and mechanical properties of polypropylene

Author(s): Shentu Bao-Qing, Li Ji-Peng, Weng Zhi-Xue
Affiliation(s): Polymer Reaction Engineering Division, State Key Laboratory of Chemical Engineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China
Corresponding email(s): shentu@zju.edu.cn
Key Words: Polypropylene (PP), N, N, N&prime

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Abstract: The effect of N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N,N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N,N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N′,N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>N′-tetraalkyl terephthalamide (TATA) on the crystallization of polypropylene (PP) was studied by means of differential scanning calorimetry, wide angle X-ray diffraction and polarized optical microscopy. It was found that the addition of TATA effectively induced the formation of β-crystalline form of PP. With the increase of TATA content both the total crystallinity degree (x) and crystallinity degree for β-crystalline form (x_β) of PP increased significantly, while the crystallinity degree for α-crystalline form (x_α) decreased. Polarized optical micrographs indicated that the addition of TATA led to a substantial decrease in the size of spherulites of PP and the boundaries of spherulites were hardly distinguished. TATA could significantly improve the impact strength, flexural strength and modulus of PP, while the tensile strength of PP did not change greatly with TATA content.

Reference

[1] Avella, M., Dell Erba, R., Martuscelli, E., 1993. Influence of molecular mass, thermal treatment and nucleating agent on structure and fracture toughness of isotactic polypropylene. Polymer, 34(14):2951-2960.

[2] Grein, C., Plummer, C.J.G., Kausch, H.H., Germain, Y., Beguelin, P., 2002. Influence of β-nucleation on the mechanical properties of isotactic polypropylene and rubber modified isotactic polypropylene. Polymer, 43(11):3279- 3293.

[3] He, M.J., Chen, W.X., Dong, X.X., 1998. Polymer Physics. Fudan University Press, Shanghai, China, p.38-48 (in Chinese).

[4] Kawai, T., Iijima, R., Yamamoto, Y., Kimura, T., 2002. Crystal orientation of β-phase isotactic polypropylene induced by magnetic orientation of N,N′-dicyclohexyl-2,6-naphthalenedicarboxamide. Polymer, 43(26):7301- 7306.

[5] Labour, T., Gauthier, C., Seguela, R., Vigier, G., Bomal, Y., Orange, G., 2001. Influence of β-crystalline phase on the mechanical properties of unfilled and CaCO₃-filled polypropylene. I. Structural and mechanical characterization. Polymer, 42(16):7127-7135.

[6] Leugering, H., Einflu, B., 1967. Der kristallstruktur and der uberstruktur aufeinige eigenschaften von polypropylene. Die Makromolekulare Chemie., 109(1):204-216.

[7] Mubarak, Y., Martin, P.J., Harkin-Jones, E., 2000. Effect of nucleating agents and pigments on crystallization, morphology, and mechanical properties of polypropylene. Plastic, Rubber and Composites, 29(7):307-315.

[8] Nitta, K., Shin, Y., Hashiguchi, H., Tanimoto, S., Terano, M., 2005. Morphology and mechanical properties in the binary blends of isotactic polypropylene and novel propylene-co-olefin random copolymers with isotactic propylene sequence 1. Ethylene-propylene copolymer. Polymer, 46:965-975.

[9] Raab, M., Scudla, J., Kolarik, J., 2004. The effect of specific nucleation on tensile mechanical behaviour of isotactic polypropylene. European Polymer Journal, 40(7):1317- 1323.

[10] Tjong, S.C., Shen, J.S., Li, R.K.Y., 1996. Mechanical behavior of injection molded β-crystalline phase polypropylene. Polymer Engineering and Science, 36(1):100-105.

[11] Zhang, X.D., Shi, G.Y., 1992. Effect of β-nucleator content on the crystallization and melting behavior of β-phase polypropylene. Acta Polymerica Sinica, (3):293-297.

[12] Zhang, Q.X., Yu, Z.Z., Xie, X.L., Mai, Y.W., 2004. Crystallization and impact energy of polypropylene/CaCO₃ nanocomposites with nonionic modifier. Polymer, 45(17):5985-5994.

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