Crystallization Kinetics And Nucleation Mechanisms In The Presence Of Melt
Polymer crystallization proceeds by nucleation and growth for a recent review of homopolymer crystallization, including kinetics and mechanism, see Schultz 2001 . If the polymer is free of contaminants, homogeneous nucleation initiates crystallization. Homogeneous nucleation requires the formation of a critical nucleus the process is thermally activated and has a large energy barrier. A large undercooling is therefore expected for homogeneous nucleation to occur at a substantial rate. In...
REFERENCES Hcb
1. Leibler, L. Macromolecules 13, 1602 1980 . 2. Bates, F. S. and Fredrickson, G. H. Annu. Rev. Phys. Chem. 41, 525 1990 . 3. Khandpur, A. K., F rster, S., Bates, F. S., Hamley, I. W., Ryan, A. J., Bras, W., Almdal, K. and Mortensen, K. Macromolecules 28, 8796 1995 . 4. Zhao, J., Majumdar, B., Schulz, M. F., Bates, F. S., Almdal, K., Mortensen, K., Hajduk, D. A. and Gruner, S. M. Macromolecules 29, 1204 1996 . 5. Floudas, G., Vazaiou, B., Schipper, F., Ulrich, R., Wiesner, U., Iatrou, H. and...
REFERENCES Nms
1 Molau, G. E. 1970 In Block Polymers Aggarwal SL, Ed., Plenum Press, New York 2 Hashimoto, T., Fujimura, M., Saijo, K., Kawai, H., Diamant, J. and Shen, M. 1979 In Multiphase Polymers Cooper, S. L. and Estes, G. M., Eds., ACS Advances in Chemistry Series, American Chemical Society, Washington, DC, 257-275. 3 Bates, F. S. and Fredrickson, G. H. 1990 Annu. Rev. Phys. Chem. 41 525-557. 4 Bates, F. S. 1991 Science 251 898-905. 5 Sakurai, S. 1995 Trends Polym. Sci. 3 90-98. 6 Holden, G., Legge, N....
MetalCatalyzedControlled Polymerizations
A wide variety of block copolymers can be prepared by metal-catalyzed controlled radical polymerizations. Most of the block copolymers consist of methacrylates and or acrylates and or styrene St , LB-1 to LB-8 in Scheme 3.2 and can be synthesized both via sequential controlled radical polymerizations and via controlled radical polymerization using macroinitiators 21-31 . CH2-CH n CH2-CH -m - CH CH n CH CH m Controlled radical polymerization of MMA followed by n-BuMA produces linear AB diblock...
Anionic Vinyl Polymerization
The carbanionic terminal groups in a living anionic polymerization can be transformed into carbon-halogen bonds suited for radical generation. Two approaches for the transformation mechanism have been proposed. First, ethylene oxide or one of its derivatives is used to quench the living anionic polymerization, resulting in hydroxyl-terminated polymers. After treatment with an appropriate reagent, a carbon-halogen terminal group is formed and used in a subsequent controlled radical...
Nonlinear Block Copolymers
Distinct from linear block copolymers, such as AB diblocks, ABA triblocks, etc., nonlinear block copolymers, such as star block copolymers, miktoarm stars, umbrella polymers, etc., are formed by joining linear blocks at their center. Nonlinear block copolymers have attracted a great deal of industrial attention due to their potential applications as thermoplastic elastomers, tough plastics, compatibilizing agents for polymer blends, polymer micelles, etc. Academic interest arises, primarily,...