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Self‐Assembled Mesomorphic Structure in Complexes of Branched Poly(ethyleneimine) with Octadecanoic Acid
Author(s) -
Cai Yuanli,
Wang Dujin,
Hu Xianbo,
Xu, Yizhuang,
Zhao Ying,
Wu Jinguang,
Xu Duanfu
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20010401)22:7<504::aid-marc504>3.0.co;2-j
Subject(s) - ethyleneimine , lamellar structure , alkyl , crystallography , chemistry , polymer chemistry , stereochemistry , materials science , organic chemistry , polymer
Self‐assembled lamellar mesophases were observed in complexes (PEI(OA) x ) of branched poly(ethyleneimine) (PEI) with octadecanoic acid (OA). The packing mode of alkyl tails between neighboring PEI layers varies from interdigitation ( x ⩽ 1.02) to end‐to‐end ( x ⩾ 1.17). A fractional increase in the trans conformation of alkyl chains for PEI(OA) x with small x causes an increase in the lamellar spacing of alkyl tails. Macrophase separation of excess free OA from complexes occurs when x is larger than 1.64.