Chain folding in semicrystalline oxybutylene/oxyethylene/oxybutylene triblock copolymers studied by Raman spectroscopy

Article Abstract:

Low-frequency Raman spectroscopy in combination with small-angle X-ray scattering and differential scanning caloimetry is used to study the chain-folding behavior of short oxybutylene/oxyethylene/oxybutylene triblock copolymers with one crystallizable E block and two noncrystallizable B blocks. The result point to folded-chain conformations in which the oxythylene blocks are orientated normal to the lamellar end plane.

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Rheology and Structures of Aqueous Gels of Diblock (Oxyethylene/Oxybutylene) Copolymer E(sub 22)B(Sub 7)

Article Abstract:

The phase behavior of an oxyethylene/oxybutylene diblock copolymer (E(sub 22)B(sub 7) in aqueous solution is studied using three properties, which are yield stress (by rheometry and tube inversion), dynamic modulus (by rheometry), and structure (by small angle X-ray scattering). By all three methods the boundary of immobile structured gel is detected.

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Aqueous solutions and gels of diblock copolymers of 1,2-butylene oxide and ethylene oxide studied by light scattering and rheology

Article Abstract:

The dependence of the micellar properties(association number and radius) of E/B diblock copolymers on E-block length is investigated for copolymers with E-block lengths upto E(sub 610). E-block length enables to predict the requirements for properties of very dilute aqueous gels.

Cyclic Crude and Intermediate Manufacturing, Ethylene, Butylenes, Butylene

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