The grafting polymerization reaction of Hemp fibers and acrylonitrile was studied in this paper, discussed hyperchromatic solution of Hemp fibers. The morphology, structure and chemical composition of Hemp fiber after and before grafting polymerization treatment were analyzed through SEM, XRD and FTIR. Results showed that grafting percentage and dyeing percentage were all enhanced because of grafting polymerization treatment on Hemp fiber.
sub-region stitching measurement of asphere by using the combination of digital moire patterns without compensator, auxiliary mirror and other assistant modules. This paper illustrated the principal theory. And use of digital filtering, phase shifting, the least square method and Zernike polynomial fitting to establish the reasonable mathematical model. Meanwhile the computer simulation experiment was carried on. the PV and RMS of the full aperture phase distribution residual error are 0.058λand 0.0087λ After this method processing.
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