Two-stage rocket-electrophoresis on cellulose acetate films

A. A. Sokolenko; G. I. Abelev

doi:10.1007/bf00799293

A modified replication technique to study the morphology of cured epoxy resin

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074100 ◽

1983 ◽

Vol 41 ◽

pp. 36-37

Author(s):

V. B. Gupta ◽

L. T. Drzal ◽

R. Omlor

Keyword(s):

Electron Microscope ◽

Epoxy Resin ◽

Cellulose Acetate ◽

Transmission Electron Microscope ◽

Polyacrylic Acid ◽

Two Stage ◽

Extreme Caution ◽

Replication Method ◽

Transmission Electron ◽

Replication Technique

There is a great deal of interest in the study of the morphology of cured epoxy resin. Generally the surfaces of the cured samples or fracture surfaces, unetched or suitably etched, are examined on the transmission electron microscope using the two-stage replica method. The replicating fluid commonly used is 25% polyacrylic acid (MW ∼ 250,000) solution in water. It dries to a brittle replica which is removed by mechanical prying with the help of tweezers; extreme caution is required to ensure that it is not damaged. It has been shown that for fractographic studies of epoxy resin, replication based on PAA can give rise to artifacts and hence it is necessary to back it uo with other evidence, e.g. from the SEM. The standard replicating fluid, containing 10% cellulose acetate in acetone, gives a softer and easily removable replica but the acetone can affect the surface of epoxy resin. To circumvent the latter problem, a modified replication method was developed and is described here.

Download Full-text

Enzyme-linked immunoassay rocket electrophoresis on cellulose acetate membrane

Journal of Reproductive Immunology ◽

10.1016/0165-0378(89)90240-4 ◽

1989 ◽

Vol 15 ◽

pp. 115

Author(s):

Chen Quing-Hui

Keyword(s):

Cellulose Acetate ◽

Cellulose Acetate Membrane ◽

Rocket Electrophoresis

Download Full-text

Two-stage phase separation of cellulose acetate membranes modified with plasma-treated natural zeolite: Response surface modeling

Polymers for Advanced Technologies ◽

10.1002/pat.4522 ◽

2018 ◽

Vol 30 (4) ◽

pp. 889-901 ◽

Cited By ~ 2

Author(s):

Mahdie Safarpour ◽

Jalal Barzin ◽

Alireza Khataee ◽

Zahra Kordkatooli

Keyword(s):

Phase Separation ◽

Cellulose Acetate ◽

Response Surface ◽

Natural Zeolite ◽

Surface Modeling ◽

Response Surface Modeling ◽

Two Stage ◽

Cellulose Acetate Membranes

Download Full-text

Cellulose Acetate Reverse Osmosis Membrane Structure

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100095893 ◽

1972 ◽

Vol 30 ◽

pp. 528-529

Author(s):

H. K. Plummer ◽

E. Eichen ◽

C. D. Melvin

Keyword(s):

Cellulose Acetate ◽

Reverse Osmosis ◽

Membrane Structure ◽

Freeze Drying ◽

Dense Layer ◽

Water Removal ◽

Reverse Osmosis Membrane ◽

Correct Interpretation ◽

Electron Image ◽

Scanning Electron

Much of the work reported in the literature on cellulose acetate reverse osmosis membranes has raised new and important questions with regard to the dense or “active” layer of these membranes. Several thickness values and structures have been attributed to the dense layer. To ensure the correct interpretation of the cellulose acetate structure thirteen different preparative techniques have been used in this investigation. These thirteen methods included various combinations of water substitution, freeze drying, freeze sectioning, fracturing, embedding, and microtomy techniques with both transmission and scanning electron microscope observations.It was observed that several factors can cause a distortion of the structure during sample preparation. The most obvious problem of water removal can cause swelling, shrinking, and folds. Improper removal of embedding materials, when used, can cause a loss of electron image contrast and, or structure which could hinder interpretation.

Download Full-text

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100153816 ◽

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.

Download Full-text