[Study on extracts of active substances from larch bark by FTIR spectroscopy].

The present study is to compare and analyze extracts of active substances from larch bark using ultrasonic wave quickly and undamagedly via Fourier transform infrared spectroscopy, second derivative IR spectroscopy and two dimensional spectroscopy. In the spectra of active substances from larch bark, there are four main components as the structural unit, and (+)-catechin, (-)-epicatechin, gallic acid and vitisinol represented a series of poly polyphenolic compounds. Furthermore the linkage between unit in proanthocyanidins dimmers was confirmed at position C(4)-C(8).

[Spectral property of one-dimensional rodlike nano cellulose].

The object of the present paper was researching a kind of nano cellulose prepared by the pretreatment of diluted acid and the physical method of high pressure homogenization. The cellulose pulp was pretreated by diluted acid and then prepared by high pressure homogenization. The one-dimensional rodlike nano cellulose was obtained.

[Study on spectroscopic characterization and property of PES/ micro-nano cellulose composite membrane material].

In the present paper, the functional groups of PES/micro-nano cellulose composite membrane materials were characterized by Fourier transform infrared spectroscopy (FTIR). Also, changes in crystallinity in composite membrane materials were analyzed using X-ray diffraction (XRD). The effects of micro-nano cellulose content on hydrophilic property of composite membrane material were studied by measuring hydrophilic angle.