Scanning electron microscopy copolymers

When P[(St-NHCOCH3)-g-AAM] was hydrolyzed in the basic solution no PAAM was released. The scanning electron microscopy (SEM) micrograph of the copolymer shows that the hydrolyzed grafted beads are still covered with PAAMs with salient micrographs. The results reveal that AAM graft copolymerization is initiated by the nitrogen radical rather than any other radical. 

Figure 9.5. Mesoporous Ti02 films templated by the KLE block copolymer, (a) Scanning electron microscopy (T = 600 °C, i.e., above the crystallization temperature) and (b) Krypton physisorption of films heat-treated at 570 °C (filled circles) and 650 °C (triangles). It is seen that the porosity of films, prepared by the advanced block copolymer template, is still intact even after treatment at temperatures that convert the amorphous Ti02 matrix into the crystalline (anatase) one. The films were prepared based on the recipe in Ref. 80.

Scanning electron microscopy (SEM) techniques have proven to be suitable for the visualization of block copolymer micelles, as illustrated in, e.g., the recent work of Erhardt et al. on Janus micelles (Sect. 7.3) [55]. 

Graft and block copolymers of cotton cellulose, in fiber, yam, and fabric forms, were prepared by free-radical initiated copolymerization reactions of vinyl monomers with cellulose. The properties of the fibrous cellulose-polyvinyl copolymers were evaluated by solubility, ESR, and infrared spectroscopy, light, electron, and scanning electron microscopy, fractional separation, thermal analysis, and physical properties, including textile properties. Generally, the textile properties of the fibrous copolymers were improved as compared with the properties of cotton products. 

Recently, scanning electron microscopy has been used in our laboratory to investigate the effects of abrasion on the morphology of fibrous cellulose copolymers (36). For example, cotton cellulose was woven into fabric form (print cloth construction and weight). Cellulose copolymer fabrics were prepared by irradiating a sample of this fabric, followed by copolymerization of the irradiated fabric with a binary mixture of acrylo-... 

The authors also reported on the supramolecular self-assembly from rod—coil—rod triblock copolymers prepared by copolymerization of 5-acetyl-2-aminob-ezophenone with diacetyl functionalized polystyrene with low polydispersity (Scheme 12).110 In contrast to the rod—coil diblock copolymers which exhibit multiple morphologies, the triblock copolymers were found to spontaneously form only microcapsules or spherical vesicles in solution as evidenced by optical polarized, fluorescence optical, and scanning electron microscopies (Figure 33). 

Figure 12.8 Scanning electron microscopy photomicrographs of quiescently coarsened and ice water quenched specimens of impact polypropylene copolymer (hiPP). Magnifications are given above each photomicrograph. (From Reference 28 with permission from John Wiley Sons, Inc.)...

Characterization of graft copolymers constitutes an important component of graft copolymerization research. It includes different techniques such as FT-IR, C-NMR, scanning electron microscopy (SEM) and X-ray diffraction (XRD). 

Fig. 22.2 Edge view by scanning electron microscopy of a T-peel test done on a block copolymer based PSA. Photo courtesy of Ken Lewtas (Exxon Mobil Chemical).

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