Characterization of block copolymers

Meehan, E. and O Donohue, S., Characterization of block copolymers using size exclusion chromatography with multiple detectors, in Chromatographic Characterization of Polymers, Hyphenated and Multidimensional Techniques, Provder, T., Barth, H. G., and Urban, M. W., Eds., American Chemical Society, Washington, D.C., 1995, chap. 18. 

Synthesis and Characterization of Block Copolymers Containing Acid and Ionomeric Functionalities... 

Characterization of Block Copolymer Micelles - Experimental Techniques... 

In the following discussion, we would like to briefly highlight the different methods used for morphological characterization of block copolymer micelles emphasizing advantages and limitations. This will be illustrated by selected examples from our own investigations on various block copolymer micelles. 

D. Berek, Mater. Res. Innovat. 4, 365, 2001 Round Table Discussion Characterization of block copolymer with liquid chromatography under critical conditions of enthalpic interactions, in International Conference on Coupled, Hyphenated and Multidimensional Liquid Chromatographic Procedures for Separation of Macromolecules, Bratislava, Slovakia, 2001. 

Hazer B (1989) Synthesis and characterization of block copolymers. In Cheremsinoff NP (ed) Handbook of polymer sciences and technology. Marcel Dekker, New York, Chap IY, p 133... 

Characterization of Block Copolymers Using Size-Exclusion Chromatography with Multiple Detectors... 

Lieske A, Jaeger W. Synthesis and characterization of block copolymers containing cationic blocks. Macromol Chem Phys 1998 199 255—260. 

Characterization of Block Copolymers. The copolymers were characterized by velocity ultracentrifugation, osmotic pressure, and ordinary element analysis in order to determine the molecular weight monodispersity of the copolymers and the degree of contamination with the corresponding homopolymers, the number average molecular weight (Mn), and the fractional compositions of the block copolymers, respectively. 

Synthesis and characterization of block copolymers. Polyisobutylene b-polyiteru butyl methacrylate) (PIB-b-PtBMA) block copolymers were synthesized by using the PIB-DPE" macroanion as initiator for the polymerization of tBMA. 

Raust, J.A. Houillot, L. Save, M. Charleux, B. Moire, C. Farcet, C. Pasch, H. Two dimensional chromatographic characterization of block copolymers of 2-ethylhexyl acrylate and methyl acrylate, P2EHA-b-PMA, produced via RAFT-mediated polymerization in organic dispersion. Macromolecules 2010, 43 (21), 8755-8765. 

M.-H. Huang, S. Li, J. Coudane, M. Vert, Synthesis and characterization of block copolymers of e-caprolactone and DL-lactide initiated by ethylene glycol or polyfethylene glycol). Macromol. Chem Hiys. 204 (2003) 1994-2001, doi 10.1002/macp.200350054. 

Structural characterization of block copolymer aggregates by dynamic and static light scattering (DLS and SLS) in combination with small angle neutron scattering (SANS) at variable ionic strength and pH in the solution enables one to discriminate between frozen and dynamic (equilibrium) micelles. In particular, SANS provides direct information about the core size and shape because of relatively low scattering density of the corona. 

Synthesis and Characterization of Block Copolymers Containing Poly(aryl ester ketone) and Liquid Crystalline Polyester Segments. Chem. J. Chin. Univ, 26(3), 589-591. 

S.M. Mai, A. Abbot, D. Norton, R. McKean, A.J. Ryan, Synthesis and characterization of block copolymers of polyoxyethylene and polylactide with different architectures, Macromolecular Chemistry and Physics 210 (10) (2009) 840-851. 

Major effort has been made on LCCC separation at the critical condition of one block. It is based on the assumption that a block can be made chromatographi-cally invisible at its critical condition and the retention of the block copolymer is determined solely by the other block that is not under critical condition [55,128, 129). This assumption is only valid if the retention of the homopolymer of the invisible block is indeed independent of molecular weight at the critical condition and if the retention of the visible block is not affected by the presence of the invisible block. If these conditions were satisfied, LCCC would undoubtedly be a powerful tool for the characterization of selected blocks within block copolymers. The applications of LCCC for the characterization of block copolymers made so far can be divided into two categories. 

AH of these works appear to support the applicability of LCCC for the characterization of selected block of block copolymers, but the precision of the method was not tested rigorously. A 10% error in the accuracy of an individual block molecular weight would not be uncommon in the characterization of block copolymers with conventional characterization methods. Therefore the apparent consistency found with several independent block copolymers would not constitute the validity of the method. In order to test the method rigorously, it is highly desirable to use a custom-made set of block copolymers. 

Combining these results it can be concluded that the LCCC experiments permit a reasonable estimation of the individual block length of diblock copolymers but the feasibility of the precise characterization of block copolymers remains questionable. A more systematic study with a variety of block copolymers and chroma-... 

Cai-Yuan, P. and Chun-I n, H. (2004) Synthesis and characterization of block copolymers prepared via controlled radical polymerization methods. In I.W. Hamley (ed.). Developments in Block Copolymers - Science and Technology. WUey, Chichester, New York, Weinheim, Brisbane, Toronto, Singapore, pp. 71-125. 

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