Part Ⅰ : Synthesis and characterization of polyimides from unsymmetrical diamine with cyano group = Part Ⅰ : 시아노기를 가진 비대칭 다이아민을 이용한 폴리이미드의 합성 및 특성에 관한 연구 ;

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A new diamine monomer containing cyano group, 2-cyano-4,4``-diaminophenyl ether, was synthesized and polymerized to polyimides with several aromatic anhydrides via two kinds of imidization methods, namely, thermal or solution imidization methods. By the thermal imidization method, tough, flexible and creasable polyimide films were obtained, except the polyimide from pyromellitic dianhydride. The polyimides had high $T_g$ values and they are stable up to 500℃ in air. The polyimides prepared by solution imidization method are partially soluble in polar aprotic solvent with heating, but the reprecipitated polymer after dissolved in concentrated $H_2SO_4$ were well dissolved in polar aprotic solvents. Four kinds of core molecules, which have tetra- or octa-hydroxyl functional group, were synthesized from bisphenol A, 4,4``-biphenol and hydroquinone. These cores and neopentyl glycol were used as an initiator for the stannous octoate catalyzed living ring opening polymerization, and linear and star poly(e-caprolactone)s were synthesized. The linear polymer is more viscous than star polymers with similar molecular weights. Melting points of the polymers decreased with the increasing number of arms and decreasing DP. The 10% weight loss temperature is dependent on molecular weight but not on the number of arms. N,N-Substituted acrylamides including N-acryloylpiperidine (N-AP), N-phenyl acrylamide (PAA), and N-methyl-N-phenyl acrylamide (MPAA) were polymerized in various conditions using trialkylaluminums. N,N-Substituted acrylamide monomers were prepared from acryloyl chloride with piperidine, aniline and N-methylaniline, respectively. Polymerization of N,N-substituted acrylamides is faster at high temperature than at low temperature, except PAA. The molecular weights of the polymers initiated by triethylaluminum are higher than those of the polymers initiated by tyriisobutylaluminum.
Advisors
Kim, Sang-Youlresearcher김상율researcher
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2000
Identifier
158639/325007 / 000983019
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 2000.2, [ viii, 83 p. ]

Keywords

Polyacrylamide; Star polymer; Cyano group; Polyimide; Aluminumalkyls; 알루미늄알킬; 폴리아크릴아마이드; 성형고분자; 시아노기; 폴리이미드

URI
http://hdl.handle.net/10203/31836
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=158639&flag=dissertation
Appears in Collection
CH-Theses_Master(석사논문)
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