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Polyimide/silica nanocomposite membranes for CO 2 separation - PowerPoint PPT Presentation


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CO 2. 2) Preparation scheme (Part I: in-situ polymerization). Diamine in DMAc. Stirring 30 min. Dianhydride. Stirring 2 hr. APTES. Stirring 6 hr. H 2 O. PAA/Si in DMAc. H 2 O. Film casting, drying at 60 o C, 6hr. Mixing 6hr. PAA/SiO 2 film. Curing (200 o C, 1hr; 300 o C, 1hr).

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slide1

CO2

2) Preparation scheme (Part I: in-situ polymerization)

Diamine in DMAc

Stirring 30 min

Dianhydride

Stirring 2 hr

APTES

Stirring 6 hr

H2O

PAA/Si in DMAc

H2O

Film casting, drying

at 60oC, 6hr

Mixing 6hr

PAA/SiO2 film

Curing (200oC,

1hr; 300oC, 1hr)

PAA/SiO2 film

Polyimide/silica nanocomposite membranes

for CO2 separation

총괄과제명: 이산화탄소 분리용 막소재개발

위탁과제명: 이산화탄소 분리용 유/무기복합막소재개발

주관기관: 한양대학교

주관연구책임자 : 이 영 무

위탁기관: 한남대학교 화학공학과

위탁연구책임자: 임 지 원

Motive and Backgrounds

고분자막소재의 문제점: 이산화탄소에 의한 가소화(plasticization)

 실제 혼합물(CO2/N2)에서 선택도의 급격한 감소

 고온 및 고압에서 더욱더 심화됨

(b)

(a)

가소화에 대한 해결방안

고분자소재의 가교(crosslinking)을 통한 사슬간의 간격 및 유동성 감소

가소화 방지효과는 있으나 근본적인 해결책 되지 않음.

탄소막 혹은 다공성 세라믹막의 경우 높은 투과선택도를 지니고 있지만

경제성 및 현실적인 이용에는 현재까지 한계가 있음.

유기고분자소재에 실리카 및 clay와 같은 무기물의 도입에 의한 고분자사슬의

유동성 제한 및 가소화 방지  본 연구의 목표

Experimental Section

Preparation of polyimide/silica membrane

derived from sol-gel reaction

(c)

(d)

  • Fig.2 Polyimide/silica SEM images:
  • silica 15wt% (b) silica 30wt% without coupling agent
  • and (c) silica 15wt% (d) silica 30wt% with coupling agent

1) Materials

Dianhydride

2) Preparation scheme (Part II: Introduction of silica particle)

6FDA

PMDA

BTDA

Soluble polyimide or poly(amic acid)

Diamine

TEOS:HCl:EtOH

ODA

PDMS

PDA

Silica Precursor

Coupling agent

300nm

Mixing

Silica sol

TEOS

APTES

50nm

Polyimide/silica nanocomposite

600nm

Fig.2 Silica particle having various sizes derived from

sol-gel reaction

Results

FT-IR Spectra of PI/Silica

29Si-NMR Spectra of PI/Silica

TGA of PI/Silica

Fig.3 FT-IR spectra of polyimide/silica

(a) silica 10wt% (b) silica 20wt% (c) silica 30wt%

Fig.4 Si-NMR spectra of polyimide/silica

(a) silica 10wt% (b) silica 20wt% (c) silica 30wt%

Fig.5 TGA thermograms of polyimide/silica

(a) silica 10wt% (b) silica 20wt% (c) silica 30wt%