6Kamm B, Kamm M. Principles of biorefineries [ J ]. Appl Mi- crobiol Biotechnol, 2004, 64(2) : 137 - 145.
7Tsutsumi N, Mizutani T, Sakai W. Internal electric field and second-order optical nonlinearity of ferroelectric nylon 11 [ J ]. Macromolecules, 1997, 6 (30) : 1637- 1642.
8Roerdink E, Warnier J M M. Preparation and properties of high molar mass nylon-4,6: a new development in nylon polymers [J]. Polymer, 1985, 26(10) : 1582 - 1588.
9Beramudez M, Leon S, Aleman C J,et al. Structure and mor- phology of nylon 46 lamellar crystals: Electron microscopy and energy calculations[ J]. J Polym Sci B- Polym Phys,2000, 38 (1) : 41 -52.