Spectroscopic Evaluation of Models for Polyelectrolyte Chain Conformation in Dilute Solution

1996 ◽  
Vol 29 (23) ◽  
pp. 7514-7520 ◽  
Author(s):  
Wanda J. Walczak ◽  
David A. Hoagland ◽  
Shaw L. Hsu
Keyword(s):  
Chain Conformation ◽  
Dilute Solution ◽  
Polyelectrolyte Chain

Analysis of polyelectrolyte chain conformation of polarized Raman-spectroscopy

1992 ◽  
Vol 25 (26) ◽  
pp. 7317-7323 ◽  
Author(s):  
Wanda J. Walczak ◽  
David A. Hoagland ◽  
Shaw L. Hsu
Keyword(s):  
Raman Spectroscopy ◽  
Chain Conformation ◽  
Polyelectrolyte Chain ◽  
Polarized Raman Spectroscopy ◽  
Polarized Raman

Chain Conformation of Hyperbranched Polymers with Uniform Branching Subchains in Dilute Solution near the θ Point

2020 ◽  
Vol 53 (18) ◽  
pp. 7980-7987 ◽  
Author(s):  
Mo Zhu ◽  
Jinxian Yang ◽  
Liangyi Li ◽  
Xiaozheng Duan ◽  
Lianwei Li
Keyword(s):  
Hyperbranched Polymers ◽  
Chain Conformation ◽  
Dilute Solution ◽  
Θ Point

pH-Dependent Complexation and Polyelectrolyte Chain Conformation of Polyzwitterion-Polycation Coacervates in Salted Water

Soft Matter ◽  
2021 ◽  
Author(s):  
Kehua Lin ◽  
Benxin Jing ◽  
Yingxi Zhu
Keyword(s):  
Aqueous Solution ◽  
Phase Behavior ◽  
Cationic Polyelectrolyte ◽  
Chain Conformation ◽  
Conformational Structure ◽  
Charge Fraction ◽  
Polyelectrolyte Chain ◽  
Ph Dependent

The phase behavior and chain conformational structure of biphasic polyzwitterion-polyelectrolyte coacervates in salted aqueous solution are investigated with a model weak cationic polyelectrolyte, poly(2-vinylpyridine) (P2VP), whose charge fraction can be...

Evolution of Single Chain Conformation for Model Comb-Like Chains with Grafting Density Ranging from 0 to ∼100% in Dilute Solution

2019 ◽  
Vol 8 (12) ◽  
pp. 1535-1540 ◽  
Author(s):  
Xuejun Pan ◽  
Muhammad Waqas Ishaq ◽  
Ahmad Umair ◽  
Muhammad Waqas Ali ◽  
Lianwei Li
Keyword(s):  
Chain Conformation ◽  
Dilute Solution ◽  
Single Chain ◽  
Grafting Density

Computer averaging of lattice images of poly-4-methyl-pentene-1 (P4mp1): Noise created artifacts

1987 ◽  
Vol 45 ◽  
pp. 388-389
Author(s):  
P. Pradère ◽  
J.F. Revol ◽  
R. St. John Manley
Keyword(s):  
Low Dose ◽  
Polymer Concentration ◽  
Processing System ◽  
Limiting Factor ◽  
Dilute Solution ◽  
New Techniques ◽  
Dose Unit ◽  
Lattice Images ◽  
Dose Imaging ◽  
Imaging Conditions

Although radiation damage is the limiting factor in HREM of polymers, new techniques based on low dose imaging at low magnification have permitted lattice images to be obtained from very radiation sensitive polymers such as polyethylene (PE). This paper describes the computer averaging of P4MP1 lattice images. P4MP1 is even more sensitive than PE (total end point dose of 27 C m-2 as compared to 100 C m-2 for PE at 120 kV). It does, however, have the advantage of forming flat crystals from dilute solution and no change in d-spacings is observed during irradiation.Crystals of P4MP1 were grown at 60°C in xylene (polymer concentration 0.05%). Electron microscopy was performed with a Philips EM 400 T microscope equipped with a Low Dose Unit and operated at 120 kV. Imaging conditions were the same as already described elsewhere. Enlarged micrographs were digitized and processed with the Spider image processing system.

Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

1989 ◽  
Vol 47 ◽  
pp. 368-369
Author(s):  
Sengshiu Chung ◽  
Peggy Cebe
Keyword(s):  
Single Crystals ◽  
High Performance ◽  
Dilute Solution ◽  
Two Stage ◽  
Annealing Behavior ◽  
High Performance Polymers ◽  
Seeding Method ◽  
Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

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