Cellulose photomicrograph

The elastomers exhibited rubber-like behavior. From an examination of electron photomicrographs of cross sections of the elastomers, the fibrillar structure of the cellulose fibers apparently formed a network, and poly (ethyl acrylate) was distributed uniformly among the fibrils. The rigid crystalline regions of the cellulose fibers apparently stabilized the amorphous, grafted poly (ethyl acrylate) to determine the mechanical properties of the elastomers (43, 44). For example, typical elastic recovery properties for these elastomers are shown in Table X. 

Figure 3.17 SEM photomicrographs of the bottom surface of cellulose acetate membranes cast from a solution of acetone (volatile solvent) and 2-methyl-2,4-pentanediol (nonvolatile nonsolvent). The evaporation time before the structure is fixed by immersion in water is shown [44]. Reprinted from J. Membr. Sci., 87, L. Zeman and T. Fraser, Formation of Air-cast Cellulose Acetate Membranes, p. 267, Copyright 1994, with permission from Elsevier...

Figure 3 shows photomicrographs of viscose fibres containing grafted PAN (50% of the cellulose mass) after cellulose was etched away in such a manner that the chemical composition and the structure of the grafted polymer were not affected50. ... 

Microscopical Examination. Solutions were aged at 25 C. A portion of each cellulose solution was carefully placed between a microscope slide and a cover slip and then examined between the crossed polarizers of an Olympus microscope. Model BHSP. Cholesteric pitch sizes were measured from photomicrographs showing the characteristic fingerprint pattern (3). 

Scanning Electron Microscopy fSEM). An IS1-40 SEM was used to take photomicrographs of cellulose fibers fractured in liquid nitrogen and coated with a gold-palladium alloy. 

Figure 5. Polarized light microscopy photomicrograph of wet mount of waterlogged wood from a prehistoric habitation site, 100 B.C.-lOO A.D., Japan. The hydrated wood shows differential degradation of cell types. Only a few isolated cells have retained birefringent cellulose.

Fig. 4.1. Electron photomicrograph of Pt-C preshadowed carbon replica of the surface of a skin layer of a Loeb-Sourirajan-type cellulose acetate membrane. Reprinted from Polymeric Gas Separation Membranes by R.E. Resting and A.K. Fritzsche, p 228. Copyright 1993, with kind permission from Wiley...

Figure 6. SEM photomicrographs of tensile fi acture surfaces of 40% cellulose-polyhydroxybutyrate composite.

---