Change in chain stiffness in viscometric and ultracentrifugal fields: Cellulose diacetate in N, N-dimethylacetamide dilute solution

1998 ◽  
Vol 108 (14) ◽  
pp. 6014-6025 ◽  
Author(s):  
Hiroyuki Kawanishi ◽  
Yoshisuke Tsunashima ◽  
Shinichi Okada ◽  
Fumitaka Horii
Keyword(s):  
Dilute Solution ◽  
Cellulose Diacetate ◽  
Chain Stiffness

Chain stiffness of heteropolysaccharide fromAeromonas gum in dilute solution by dynamic light scattering

Biopolymers ◽  
2002 ◽  
Vol 65 (6) ◽  
pp. 387-394 ◽  
Author(s):  
Xiaojuan Xu ◽  
Lina Zhang ◽  
Yo Nakamura ◽  
Takashi Norisuye
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Dilute Solution ◽  
Chain Stiffness

Dilute solution properties of cellulose diacetate in mixed solvents

2000 ◽  
Vol 85 (3) ◽  
pp. 331-350 ◽  
Author(s):  
Boẑica Pintarić ◽  
Marko Rogošić ◽  
Helena Jasna Mencer
Keyword(s):  
Mixed Solvents ◽  
Solution Properties ◽  
Dilute Solution ◽  
Cellulose Diacetate ◽  
Dilute Solution Properties

Dilute solution properties, chain stiffness, and liquid crystalline properties of cellulose propionate

1995 ◽  
Vol 33 (10) ◽  
pp. 1537-1544 ◽  
Author(s):  
G. A. Casay ◽  
A. George ◽  
N. Hadjichristidis ◽  
J. S. Lindner ◽  
J. W. Mays ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Solution Properties ◽  
Dilute Solution ◽  
Chain Stiffness ◽  
Dilute Solution Properties ◽  
Cellulose Propionate

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.

Sign in / Sign up

Export Citation Format

Share Document