Browse > Article
http://dx.doi.org/10.12772/TSE.2013.50.225

Miscibility and Compatibilization by Encapsulation of Polycarbonate/Syndiotactic Polystyrene Blends  

Park, Eun Ju (School of Applied Chemical Engineering, Chonnam National University)
Jo, Soo Bong (Advanced Chemicals and Engineering, Chonnam National University)
Lee, Moo Sung (School of Applied Chemical Engineering, Chonnam National University)
Publication Information
Textile Science and Engineering / v.50, no.4, 2013 , pp. 225-231 More about this Journal
Abstract
The miscibility of the blends of polycarbonate (PC) and syndiotactic polystyrene (s-PS) was investigated by using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The blends exhibit two different glass transition temperatures ($T_g$) close to those of the pure components, indicating immiscibility at the melt mixing temperature of $280^{\circ}C$. Morphological studies of the blends shows large dispersed particles and significant cavities between the matrix and the dispersed phase, especially for the PC matrix blends. To reduce such detrimental effects, poly(methyl methacrylate) (PMMA) or styrene-maleic anhydride copolymer (SMA) was added as a compatibilizer to the PC/s-PS blends. Both polymers contribute to enhancing the interfacial adhesion between PC and s-PS and reduce the particle size of the dispersed phase. Especially when PMMA was added, morphological studies showed that PMMA encapsulates the dispersed s-PS phase in the PC matrix. The elastic modulus of the PC/s-PS blend increased on adding PMMA or SMA, mainly because of enhanced interfacial adhesion. The pencil hardness of PC increased at least three times from that of neat PC as a result of compatibilization and surface enrichment of the s-PS phase, whose surface tension is lower than that of PC.
Keywords
syndiotactic polystyrene; polycarbonate; blend; miscibility; compatibilization; encapsulation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 W. J. D. Steendam and R. Puyenbroek, "Scratch Resistant Polycarbonate Compositions", US Patent, 0124749 A1 (2009).
2 L. A. Utracki, Ed., "Polymer Blends Handbook", Kluwer Academic Publishers, Dordrecht, 2002, Vol.2, p.1082.
3 W. N. Kim and C. M. Burns, "Thermal Behavior, Morphology, and the Determination of the Flory-Huggins Interaction Parameter of Polycarbonate-polystyrene Blends", J Appl Polym Sci, 1987, 34, 945-967.   DOI   ScienceOn
4 C. Z. Chuai, K. Almdal, I. Johannsen, and J. L. Lyngaae- Jorgensen, "Miscibility Evolution of Polycarbonate/polystyrene Blends during Compounding", Polym Eng Sci, 2002, 42(5), 961-968.   DOI   ScienceOn
5 C.-J. Chou, "Compatibilized Polycarbonate Syndiotactic Vinyl Aromatic Polymer Blends", US Patents, 5,241,015 (1993).
6 S. H. Hobbs, M. E. J. Dekkers, and V. H. Watkins, "Effect of Interfacial Forces on Polymer Blend Morphologies", Polymer, 1988, 29, 1598-1602.   DOI   ScienceOn
7 Y. Koseki, M. S. Lee, and C. W. Macosko, "Encapsulation in Ternary Elastomer Blends", Rubber Chem Technol, 1999, 72(1), 109-118.   DOI
8 L. A. Utracki, Ed., "Polymer Blends Handbook", Kluwer Academic Publishers, Dordrecht, 2002, Vol.1 and 2.
9 U. Sundararaj and C. W. Macosko, "Drop Breakup and Coalescence in Polymer Blends: The Effects of Concentration and Compatibilization", Macromolecules, 1995, 28, 2647-2657.   DOI   ScienceOn
10 P. Potschke and D. R. Paul, "Formation of Co-continuous Structures in Melt-Mixed Immiscible Polymer Blends", J Macromol Sci: Part C-Polym Rev, 2003, C43(1), 87-141.
11 J. Kolarik, "Simultaneous Prediction of the Modulus and Yield Strength of Binary Polymer Blends", Polym Eng Sci, 1996, 36(20), 2518-2524.   DOI   ScienceOn
12 C. Xiang, H.-J. Sue, J. Chu, and B. Coleman, "Scratch Behavior and Material Property Relationship in Polymers", J Polym Sci: Part B: Polym Phys, 2001, 39, 47-59.   DOI   ScienceOn
13 http://www.sabreen.com/surface_wetting_pretreatment_methods.pdf