PPS/PPSS ??????????????? ?????? ??? ?????? ??????

p-Dichlobenzene(DCB), p-dibromobenzene(DBB), p-diiodobenzene(DIB) ??? 4-chlorophenyl sulfone(CPS)??? ???????????????, ????????? N-methyl-2-pyrrolidinone(NMP)??? ????????? ???????????? ??????, ??????????????? poly(phenylene sulfide-co-phenylene sulfide sulfone), PPS/PPSS ??????????????? ???????????? ????????? ?????? ????????? ????????? ?????????????????? ?????? ??? ??????????????? ?????? ???????????????. PPS/PPSS ??????????????? ????????? [DBB]/[CPS] ??? [DIB]/[CPS] ???????????? ????????? ?????? [DCB]/[CPS] ???????????? ???????????? ?????? ????????? 190????????? ?????? ????????? ?????????????????? [DCB]/[CPS] ???????????? ????????? ????????? ????????? ?????? ????????? 230????????? ?????? ????????? ???????????? leaving group??? I > Br > Cl??? ????????? ????????? ????????? ??? ?????????????????? ?????????????????? ????????? ????????? nucleophilic aromatic substitution(SNAr) ????????? ???????????? ??? ??? ?????????. [DBB]/[CPS] ???????????? ??????????????? CPS??? ???????????? 10 mol%??? ??? ????????? PPS/PPSS ??????????????? ???????????? 8,330g/mol??? ?????? ?????? ????????????. CPS ???????????? ???????????? 30 mol% ????????? ?????? ???????????? PPS/PPSS ??????????????? Tm??? ???????????? ????????????, CPS??? ???????????? 10 mol%??? PPS/PPSS ???????????? ????????? ?????? Tg??? ??? 15??? ??????????????? Tm??? ??? 15??? ???????????? ?????? ????????? ???????????? ?????? ??? ??? ?????????. ??? ?????? ????????? 240?????? ???????????? [DBB]/[CPS]??? ???????????? 95/5 mol%??? ?????? ????????? PPS/PPSS ??????????????? PPS ?????? ??????????????? ???????????? ?????? ????????? PPS ?????? ???????????? ???????????? ??? ???????????? ???????????? PPS ?????? ???????????? ????????? ????????? ???????????? ???????????? ??? ?????? ???????????? ????????? ??? ????????? ???????????????. Poly(phenylene sulfide-co-phenylene sulfide sulfone), PPS/PPSS copolymers were synthesized from p-dichlobenzene(DCB), p-dibromobenzene(DBB), p-diiodobenzene(DIB), 4-chlorophenyl sulfone(CPS) and sodium sulfide as comonomers under high temperature and pressure utilizing N-methyl-2-pyrrolidinone(NMP) as solvent. The yield of PPS/PPSS copolymer shoed maximum at 190??? with [DBB]/[CPS] and [DIB]/[CPS] comonomer pair, while [DCB]/[CPS] pair exhibited maximum yield at 230???. The change of yield is in the order of I > Br > Cl as leaving groups were in accordance with nucleophilic aromatic substitution reaction mechanism suggested for the synthesis of PPS type polymers. The molecular weight of PPS/PPSS copolymer was the highest(Mw=8,330g/mol) with [DBB]/[CPS] comonomers in which [CPS] was 10 mole%. The PPS/PPSS copolymer made with 10 mole% of [CPS] showed about 15??? higher Tg and 15??? lower Tm than those of PPS homopolymer, which may be useful from the processing and thermal property point of view. The PPS/PPSS copolymer with 30 mole% of CPS or above did not exhibit Tm. The PPS/PPSS copolymer obtained with comonomer feed ratio of [DBB]/[CPS] = 95/5 mole% under 240??? showed even higher molecular weight(Mw=10,300g/mole) than PPS homopolymer made under similar reaction condition, retaining high crystallinity and thermal stability.clos

EsterImide 조성이 Poly(ester-imide) 경화물의 열적 특성에 미치는 영향

N,N`-(4,4`-diphenyl methane) bistrimellitimide (DIDa)와 dimethyl terephthalate (DMT), ethylene glycol 및 1,3,5-tris-(2-hydroxy ethyl) isocyanurate를 중합시켜, DIDa/DMT 공중합체를 합성하였다. 이 때 DIDa 단량체는 trimellitic anhydride와 methylene dianiline를 반응시켜 합성하였으며, DIDa와 DMT의 조성비를 100:0으로 변화시켜 공중합체를 합성하였다. 합성된 공중합체와 isocyanate 화합물을 반응시켜 가교시켰다. 단량체 및 공중합체의 구조는 원소분석 및 분광분석을 통하여 확인하였다. GPC 분석 결과 합성된 공중합체는 3000 미만의 중량 평균분자량 값을 나타내었으며, 공중합 유형은 4~5가지를 나타내었다. 공중합체의 조성과 경화제의 종류가 경화물의 열적특성에 미치는 영향을 DSC 및 TGA를 통하여 고찰하였으며, 이 때, Freeman-Carroll식을 이용하여 poly(ester-imide) 경화물의 열안정성을 고찰하였다. 경화물의 열안정성은 DIDa의 함량이 증가할수록 증가하였다.clos

???????????? ?????? ????????? Poly(ester-imide) ????????? ?????? ??? ??????

????????? ?????? ?????? coating??? ???????????? ?????? ????????? poly(ester-imide) (PEI)??? 1?????? ??? 2?????? ???????????? ?????????????????? ????????? ????????? ???????????????. Poly(ester-imide) ????????? ????????? ????????? trimellitic anhydride(TMA)??? methylene dianiline(MDA)???????????? imide ?????? ????????? ???????????? N,N''-(4,4''-diphenylmethane)bistrimellitimide(DID)??? ?????? ???????????? ??????????????? ????????? ????????? 2???????????? TMA, MDA, dimethyl terephthalate(DMT) ??? ethylene glyocol(EG), 1,3,5-tris-(2-hydroxy ethyl)isocyanurate(THEIC)??? ?????? m-cresol ????????? ?????? ??????????????? 1???????????? ????????? PEI ????????? ???????????? ????????? ??? ?????????. ????????? poly(ester-imide) ?????? ????????? xylene, phenol-formaldehyde ????????? P-5030K, TDI type blocked isocyanate??? TK-8 ??? tetrapropyltitanate(TPT)??? ???????????? ?????? ????????? ????????? ????????? ????????? ????????? ??? ???????????? ????????? ?????? ?????????????????? ??????, DMT??? ?????? ??? imide ?????? ????????? ????????? ????????? ?????? ????????? ????????? ????????? ????????? ???????????? ??? ??? ?????????. Poly(ester-imide)(PEI) for the electrical insulation coating was synthesized and evaluated with one-step method as well as two-step method. For the synthesis of poly(ester-imide), imide repeat unit of N,N`-(4,4`-diphenylmethane) bistrimellitimide(DID) was initially made from trimellitic anhydride(TMA) and methylene dianiline(MDA), followed by the second stage reaction of esterification. One-step reaction was performed by reaction of TMA, MDA, dimethyl terephthalate(DMT), ethylene glycol(EG), and 1,3,5-tris-(2-hydroxy ethyl) isocyanurate(THEIC) in m-cresol solvent at a time. The synthesized poly(ester-imide) was cured with xylene, P-5030K(phenol-formaldehyde resin), TK-8(TDI type blocked polyisocyanate) and tetrapropyltitanate(TPT). It was found that the content of hydroxyl group, amount of DMT, and imide repeat unit played important role for the properties of electrical insulation coating film.clos