Premium
Monolayer formation of chitin derivatives containing PMMA side‐chains
Author(s) -
Ren LongDi,
Goto Yasutomo,
Kaneko Hiroaki,
Shirai Akihiro,
Nishi Norio,
Nishimura ShinIchiro,
Yamagishi Akihiko,
Tokura Seiichi
Publication year - 1994
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1994.210350401
Subject(s) - monolayer , surface pressure , lysozyme , phase (matter) , chitin , materials science , phase transition , polymer chemistry , aqueous solution , derivative (finance) , chemical engineering , chemistry , crystallography , organic chemistry , chitosan , nanotechnology , thermodynamics , biochemistry , physics , mechanics , financial economics , engineering , economics
The monolayer behaviour of poly(methyl methacrylate) (PMMA)‐grafted chitin derivatives was studied on an air–water interface by measuring surface pressure–area isotherms. The formation of a stable monolayer indicates the well‐defined packing and orientation of the chitin derivative, which can be regulated by the main‐chain length under appropriate experimental conditions. The isotherms exhibit a transition point from a liquid expanded phase to a condensed phase at a surface pressure of approximately 15mN/m for almost all monolayers examined. The transition pressure decreases with increase of temperature from 10 to 20°C. The properties of the sub‐phase affected the formation of a monolayer greatly. The collapse of a surface film takes place at lower pressure on the sub‐phase of a 0.1 M NaCI solution. After introducing lysozyme at a concentration at 2.4 × 10 −8 M to the sub‐phase, the monolayer showed an extensively expanded phase with a longer transition region. This indicates that the monolayer was degraded by the lysozyme, resulting in a disordered structure. The results are contrasted with those of an aqueous phase where N ‐acetylglucosamine residues may be inaccessible to lysozyme so that the degradation of the chitin derivative occurs at a very slow rate.