2 edition of Association of block copolymers of ethlene oxide and butylene oxide in aqueous solution. found in the catalog.
Association of block copolymers of ethlene oxide and butylene oxide in aqueous solution.
Thesis (Ph.D.), - University of Manchester, Department of Chemistry.
|Contributions||University of Manchester. Department of Chemistry.|
|The Physical Object|
|Number of Pages||278|
ethylene oxide unit and B denotes a butylene oxide unit, 18 and 9 being the number of repeat units respectively) in aqueous solution over a range of ﬁve different concentrations (, , , , and % (by mass fraction)) and eight temperatures (10 to 90 C). The ϕ value can mathematically be made equivalent to where C m is the concentration of copolymer molecules in associated (micellized) form and has an unit in terms of mol dm − The micelles of copolymers or surfactants in water consist of hydrophobic core surrounded by hydrophilic corona. The scattering length densities of polyoxybutylene ( × 10 10 cm −2), SDS (− × 10
Kelarakis, Antonios ORCID: , Havredaki, Vasiliki, Viras, Kyriakos, Mingvanish, Withawat, Heatley, Frank, Booth, Colin and Mai, Shao-Min () Aqueous solutions and gels of diblock copolymers of 1,2-butylene oxide and ethylene oxide studied by light scattering and rheology. The Journal of Physical Chemistry B, (31). p. Ellipsometric characterization of ethylene oxide-butylene oxide diblock copolymer adsorption at the air-water interface the amount of EB16 adsorbed at the air-water interface was found to be almost identical to that adsorbed from aqueous solution onto a hydrophobic solid surface. also briefly discuss within which limits the Gibbs.
The association number of the micelles was found to vary as a function of copolymer composition following a similar scaling law to that observed, by others, in aqueous solution. Reaction-induced macrophase separation was observed in some BEB systems at elevated temperature, but not in . Alexandridis P, Hatton TA. Poly(Ethylene Oxide)-Poly(Propylene Oxide)-Poly(Ethylene Oxide) Block-Copolymer Surfactants in Aqueous-Solutions and at Interfaces - Thermodynamics, Structure, Dynamics, and Modeling. Colloid Surface A. ; –
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Association Properties of Diblock Copolymers of Ethylene Oxide and 1,2-Butylene Oxide in Aqueous Solution. Copolymers with Oxyethylene-Block Lengths in the Range − Chain Units.
The Journal of Physical Chemistry B(51), DOI: /jp+.Cited by: The association behavior of a triblock ethylene oxide (E) and butylene oxide (B) copolymer with a very long middle E block (B12EB12) in aqueous solution has been investigated by means of laser light scattering.
The flower-like closed association behavior of BEB−type triblock copolymers in aqueous solution can be altered to form open, branched, associated structures because of the very Cited by: The association properties of triblock copolymers of ethylene oxide and 1,2-butylene oxide in aqueous solution were investigated.
The critical micelle temperatures were obtained from plots of. Association Properties of Diblock Copolymers of Ethylene Oxide and 1,2-Butylene Oxide in Aqueous Solution. Copolymers with Oxyethylene-Block Lengths in the Range − Chain Units Withawat Mingvanish, Shao-Min Mai, Frank Heatley, and Colin Booth, David AttwoodCited by: The association behavior of a triblock ethylene oxide (E) and butylene oxide (B) copolymer with a very long middle E block (B12EB12) in aqueous solution has.
Effect of block architecture on the micellisation and gelation of block copolymers of ethylene oxide and 1,2-butylene oxide in aqueous solution Antonis Kelarakis, Vasiliki Havredaki, Leo Derici, Ga-Er Yu, Colin Booth and Ian W. Hamley. Zhang K, Lindman B, Coppola L: Melting of block copolymer self-assemblies Induced by a hydrophilic surfactant LangmuirLad K, Bahadur A, Pandya K, Bahadur P: Clouding and aggregation behaviour of ethylene oxide/propylene oxide/ethylene oxide block copolymers in aqueous media in the presence of sodium dodecyl sulphate.
(English) In: Polymer, ISSNE-ISSNVol. 38, p. Article in journal (Refereed) Abstract [en] Three copolymers of ethylene oxide (EO) and 1,2-butylene oxide (BO) were prepared by anionic polymerization to have similiar molar masses (Mn ≈ g mol-1), molar mass distributions (Mw/Mn.
) and compositions (80mol% oxythylene) but different chain structures. Recent work on water-soluble block copolymers of ethylene oxide and 1,2-butylene oxide is described.
Small-angle X-ray and neutron scattering have been used to probe the structures of aqueous micellar mesophases, with particular attention paid to the. Copolymers of ethylene oxide with propylene oxide, 1,2‐butylene oxide or styrene oxide are considered, including aspects of their preparation. Experimental methods for determination of critical conditions for micellisation, micelle association.
The E m S n E m copolymers were prepared in 30–50 g quantities by oxyanionic polymerisation of styrene oxide starting from a difunctional initiator to form the central block, followed by ethylene oxide to form the end blocks (Yang et al., a).Copolymer E 62 P 39 E 62 (F87) was a gift from ICI Surfactants, now Uniqema.
The molecular characteristics of the copolymers are. The dependence of log(cmc) on hydrophobic block length n was examined for EmBn copolymers (E=oxyethylene, B=oxybutylene, subscripts denote number-aver. Request PDF | Diblock copolymers of ethylene oxide and 1,2-butylene oxide in aqueous solution Formation of unimolecular micelles | The dependence of log(cmc) on hydrophobic block length n was.
Ethylene oxide and 1,2-butylene oxide were sequentially polymerised to form the diblock copolymer E13B10 (E=oxyethylene, B=oxybutylene, subscripts denote number-average block. The dependence of CMC on temperature, together with differential scanning calorimetry experiments, indicates that the micellization process of PEO PPO PEO copolymers in water is endothermic and driven by a decrease in the polarity of ethylene oxide (EO) and propylene oxide (PO) segments as the temperature increases, and by the entropy gain in.
Ethylene oxide and 1,2-butylene oxide were sequentially polymerised to form the diblock copolymer E 13 B 10 (E = oxyethylene, B = oxybutylene, subscripts denote number-average block lengths in repeat units). Dynamic and static light scattering over the temperature range 10–30 °C demonstrated a transition from compact (spheroidal) micelles to larger, more elongated (worm-like).
Block copolymers were prepared by copolymerization of ethylene oxide and butylene oxide to have identical overall composition and chain length but to differ in their distributions of oxyethylene. Focuses on copolymers made from sequential block polymerizations of ethylene oxide, propylene oxide and 1, 2-butylene oxide.
This text presents the latest applications of polyoxyalkylene block copolymers in areas such as medicine, coal and petroleum, plastics, emulsion polymerization, paper, photography, personal care and cleaner systems. It offers in-depth coverage of the subject from.
the block length, and the block architecture allows close control of properties. Commercially available block co-polymers of ethylene oxide with propylene oxide or 1,2-butylene oxide have been available for some time and have provided materials for academic research, and the range has been significantly extended by laboratory.
Triblock polyethyelene oxide–polybutylene oxide-based block copolymers overcome some of the synthetic drawbacks of commercially available Pluronic block copolymers as well as providing a more hydrophobic environment to solubilise poorly aqueous-soluble compounds. These facts can be exploited to use this class of co.
Values of the micelle association number are used to define a critical hydrophobic block length for micellisation (n cr) for each class of diblock copolymers, values of which apply equally well to the half-length of the central block of corresponding E m A n E m triblock copolymers.in aqueous solutions of a triblock copolymer of ethylene oxide and 1,2-butylene oxide, E 64 B 20 E 64 Songklanakarin J.
Sci. Technol.,25(6): Block copolymer E 64 B 20 E 64, where E denotes oxyethylene, OCH 2 CH 2, B denotes oxybutylene, OCH 2 CH (C 2 H 5), and the subscripts denote number-average block lengths in repeat units.Triblock copolymer E 72 B 27 E 72 was prepared by sequential anionic polymerisation of butylene oxide followed by ethylene oxide.
Some of this copolymer was cyclised via acetal closure to yield a cyclic diblock copolymer, cyclo-B 27 E Gel-phase chromotography (GPC) and NMR were used to characterise the copolymers.
Aqueous solutions of both block copolymers were micellar at very .