High molecular weight linear polyethylenimine and poly(N-methylethylenimine) Tanaka, Ryuichi ; Ueoka, Isao ; Takaki, Yasuhiro ; Kataoka, Kazuya ; Saito, Shogo Abstract Publication: Macromolecules Pub Date: June 1983 DOI: 10.1021/ma00240a003 Bibcode: 1983MaMol..16..849T