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Xigao Jian, Xiuling Zhu
Department of Polymer Science & Materials, Dalian University of Technology,
Dalian 116012, China
Introduction
High performance polymers that exhibit excellent comprehensive properties including good thermostability, unique mechanical property, chemical solvent-resistance and low density are of great interest in the world. However, poor solubility limited their uses in many fields1. In our previous papers, we reported the phthalazinone-based high performance polymers as shown in Scheme 1 and they exhibit enhanced solubility, high thermostability and excellent mechanical properties due to their twist non-coplanar moieties in polymers’ main chain2~5. Thus they extend their applications in various fields such as aerospace and electronics due to their unique properties.
The phthalazinone-based polymer’s family: poly(aryl ether)s, poly(ether amide)s and poly(ether imide)s
1,2-dihydro-4-(4-hydroxyphenyl)(2H)-2,3-phthalazinone-1 (DHPZs) novel compound and series of substituted diamines (DAms) and dianhydrides (DAns) phthalazinone-based were synthesized successfully in our research lab. Thus, classes of novel poly(aryl ether)s (PPEK, PPES, PPESK, PPEKK, PPENS, PPENK), poly(ether amide)s (PPEA), poly(ether imide)s (PPEI) and poly(ether amide imide)s (PPEAI) containing phthalazinone moieties in polymers’ main chain were prepared by reaction of DHPZs with activated dihalides, or reaction of DAms, DAns with various diacids / diamines respectively via solution polycondensation (Scheme 1).
Scheme 1. The family of phthalazinone-based high performance polymers
Extensive research work in our lab disclosed that DHPZ has twist non-coplanar configuration by chemical 3D model. The kink biphenyl unit and aza-hetero ring in polymers’ backbone devoted much to the their excellent heat-resistance (Tg=263~350℃), outstanding mechanical properties and good solubility 3.
The modification and separation membrane of poly(phthalazinone ether)s
Poly(aryl ether)s based on phthalazinone (PPEK, PPES, PPESK) are organosoluble and they are challenging heat-resistant membrane materials6~8. The membranes made up of PPESK, PPEA showed good separation and permeation properties for O2 / N2 and CO2 / N2. A novel sulfonated 1,2-dihydro-4 (4-hydroxyphenyl)(2H)-2,3-phthalazinone-1(SDHPZ), sulfonated 4,4’-dichlorodiphenylsulfone (SDCDP), and sulfonated poly(phthalazinone ether sulfone ketone) ( SPPESK ) were synthesized respectively and made into ultrafiltration membranes or composite nanofiltration membranes. Study on the synthetic procedure and performance of membrane showed prospective future of this kind of heat-resistant membrane materials.
Much research work has been devoted to improvement of melting processability towards phthalazinone-based PPEKs, PPESs, PPESKs because of their high melting viscosity9, 10. These materials were modified by blending with PPESK oligomer, TLCP and commercial poly(phenylene sulfide) (PPS) while maintaining good thermostability. Study on the PPESK used as heat-resistant matrices of composites also showed the prospective future.
References
[1] Cassidy P E. Thermally Stable Polymers, Marcel Dekker Inc., New York and Basel, 1980, 67.
[2] Y J LIU, X G JIAN, S J LIU. Synthesis and characterization of novel poly(phthalazinone ether ketone ketone). Journal of Applied Polym. Sci, 82(4), 823-826, 2001
[3] Chen L. Z., Jian X. G., Zhu X. L., Polym. J., 31(4), 393, 1999.
[4] Meng Y. Z., Hay A. S., Jian X. G. et al, J. Appl. Polym. Sci., 66, 425, 1997.
[5] Zhu X L, Jian X G, Wang R L, Chin. Chem. Lett., 12 (6), 517, 2001.
[6] Y Dai, X G Jian et al, Synthesis and Characterization of Sulfonated Poly(phthalazinone ether sulfone ketone ) for Ultrafiltration and Nanofiltration Membranes, J.Applied Polym. Sci., 79,1685-1692 (2001)
[7] Jian X. G., Dai Y., He G. H., Chen G. H., J. Membrane Sci., 4182, 1-7, 1999.
[8] Jian X. G., Zhang S H, Dai Y et al, Chinese Membrane. Sci & Tech.,21(1), 11, 2001.
[9] Liao G X, Jian X G, Jin Q F et al, Acta of Polymeric Sinica, (3), 394~397, 2002.
[10] Liao G X, Jian X G, He W, IUPAC World Polymer Congress, 7, 648, 2002, Beijing.
论文来源：Preprints of Third East Asian Polymer Conference,June,2004 |
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