Radiation-induced graft copolymerization of methyl methacrylate on natural and modified wool. V. Crystalline and morphological structure. [. gamma. -rays]

Journal Article · Sat Mar 01 04:00:00 EST 1980 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1980.070250314· OSTI ID:5486650

Varma, D S; Sadhir, R K

X-ray diffraction patterns of the ..cap alpha..- and ..beta..-crystalline phases of natural, chemically modified, and MMA-grafted wool fibers were investigated. In the grafted fibers variation of the equatorial and meridional scattering intensity during the ..cap alpha..-..beta.. transformation was inhibited. This indicated that the grafting had stabilized the structure to the ..cap alpha..-..beta.. transformation. The average crystallite size was found to increase with the extent of grafting, and the degree of orientation appeared to decrease with percent graft-on. SEM studies revealed little damage to the surface topography of wool fibers after chemical treatments. Graft copolymerization with MMA made the fiber surface regular and smooth, mainly because of deposition of polymer in the escarpment, thus reducing the sharpness of the scaly structure. Scanning electron micrographs of the peeled-off surface and cross sections of the grafted fibers indicated that a significant amount of polymer was deposited in the medullae of the fibers.

• Research Organization: Indian Inst. of Technology, New Delhi
• OSTI ID: 5486650
• Journal Information: J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 25:3; ISSN JAPNA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
CARBOXYLIC ACID ESTERS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COPOLYMERIZATION
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
ESTERS
GAMMA RADIATION
GRAFT POLYMERS
IONIZING RADIATIONS
METHACRYLIC ACID ESTERS
METHYL METHACRYLATE
MORPHOLOGY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERIZATION
POLYMERS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
WOOD