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실로산 가교와 우레탄 가교 고체고분자 전해질의 열 및 전도특성
노시태,정태화,권종옥 한국공업화학회 1998 응용화학 Vol.2 No.1
Crosslink in solid polymer electrolytes(SPE) affect the improvement of mechenical properties, the destruction of crystallinity, and the elevation of conductivity. We investigated two types of SPE films which have different crosslinking structures. First, siloxane crosslinked SPE films prepared by sol-gel method have inorganic filler. Second, urethane crosslinked SPE films have the simple chemical crosslink. It has been known that inorganic-filled SPE films have excellent thermal, electrical stability and mechnical properties. In this study, we investigated the thermal and conductive properties of the SPE films having siloxane crosslink or urethane crosslink with the change of temperature and salt contents. We could prepare transparent and amorphous polymer electrolyte films. With the increase of salt content T_g increased. Comparing PEG600 to PEG1000, the T_g of PEG1000 was lower than that of PEG600. The T_g of urethane crosslink was lower than that of siloxane crosslink for PEG600. LiClO₄ was used as salt. In futher study, we will investigate the thermal and conductive properties with the inter-crosslink molecular weight of urethane crosslink.
( Minkyung Lim ),( Yoorim Jang ),( Jeong-ohk Kweon ),( Yang-ho Seol ),( Hakjune Rhee ),( Si-tae Noh ) 한국공업화학회 2020 공업화학 Vol.31 No.3
Energetic thermoplastic elastomers (ETPEs) based on glycidyl azide polymer (GAP) and carboxylated GA copolymers [GAP-ETPE and poly(GA-carboxylate)-ETPEs] were synthesized using isophorone diisocyanate (IPDI), dibutyltin dilaurate (DBTDL), 1,4-butanediol (1,4-BD), and soft segment oligomers such as GAP and poly(GA-carboxylate). The synthesized GAP-ETPE and poly(GA-carboxylate)-ETPEs were characterized by Fourier transform infrared (FT-IR), gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), universal testing machine (UTM), calorimetry and sensitivity towards friction and impact. DSC and TGA results showed that the introduction of carboxylate group in GAP helped to have better thermal properties. Glass transition temperatures of poly(GA-carboxylate)-ETPEs decreased from -31 ℃ to -33 ℃ compared to that of GAP-ETPE (-29 ℃). The first thermal decomposition temperature in poly(GA<sub>0.8</sub>-octanoate<sub>0.2</sub>)-ETPE (242 ℃) increased in comparison to that of GAP-ETPE (227 ℃). Furthermore, from calorimetry data, poly(GA-carboxylate)-ETPEs exhibited negative formation enthalpies (-6.94 and -7.21 kJ/g) and higher heats of combustion (46713 and 46587 kJ/mol) compared to that of GAP-ETPE (42,262 kJ/mol). Overall, poly(GA-carboxylate)-ETPEs could be good candidates for a polymeric binder in solid propellant due to better energetic, mechanical and thermal properties in comparison to those of GAP-ETPE. Such properties are beneficial to application and processing of ETPE.