GCRC-SOP 2nd Year International Workshop
Open Proposal Project # 4
Development of High Impact Polyurethane
Rigid Foams for Ship
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Insulation foam used in ship & marine structure: Pipe, wall, LNG cargo & storage tank---PU foam exclusively used
Open Project No 4: High Impact Polyurethane Foam
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Materials k
Air 0.0250
CO2 0.0165
HFC-365mfc 0.0106
PU rubber 0.16
PU form 0.02
PS foam 0.03
Wood 0.2
Glass (Toughened) 1.0
Thermal Conductivity (W/mK) @298K
Why foam is used ? ▶ low k, low densityWhy PU foam? ▶ Strong, dimensionally stable,
easily processable
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• Polyurethanes
Polyol Isocyanate Polyurethane Heat
• Chemical Blowing Agent
• Physical Blowing Agent
HFC-365mfc: CF3CH2CFHCH3
Zero ODP and low GWP (Tb=41℃)
Open Project No 4: High Impact Polyurethane Foam
+ΔHR
4Open Project No 4: High Impact Polyurethane Foam
Synthesis of PU foam for ship applicationsBased on
Molecular design
Eecofriendly foaming agent
Chemical hybridizations with inorganic fillers
To facilitate
High mechanical strength
Dimensional stability
Thermal insulation &
Shape memory performance
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Topic 1: PU/Silica, PU/CNT Nanocomposite Foamsaugmented
modulus, strength, thermal stability,
shape memory properties as multifunctional cross-linksover the unfilled foam
Topic 2: PU/GF Rigid Forms enhanced
hardness, modulus, strength, thermal stability, and thermal conductivity
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Results of Topic 1
PU/Silica & PU/CNT Flexible Foams
Enter Project No: Project Title in Slide Master 7
Table 1. Formulations to prepare the PU/silica nanocomposite foams (unit: pphp).
SR-240, GP-300 Polyol (PPG)TA-350: Cell opener (Poly(PO/EO))L626: Silican surfactantA1, MC: Blowing catalystT9:Gelling catalystAerosil 200: Silica particle (Diameter 8nm)
Topic1-1 : Results
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Scheme 1. Isocyanate modification of silica particles.
Enter Project No: Project Title in Slide Master 9
Figure 2. SEM micrographs of the foams: (a) S0, (b) S2, (c) NS1, (d) NS2, and (e) NS5.
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Figure 4. Tensile properties of the foams for various silica contents.
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Figure 5. Compression properties of the foams for various silica contents.
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Figure 6. Dynamic mechanical properties of the foams for various silica contents.
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Figure 7. Thermomechanical cycles of the foams: (a) S0, (b) S2, and (d) NS2.
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Table 1. Formulations to synthesis CNT/polyurethane foam nanocomposites
CNT-COOH: Acid treated CNT
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Figure 3. Compressive strength of the composite foams.
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Figure 5. Thermomechanical cyclic behavior for the composite foams.
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Results of Topic 2
PU/GF Rigid Forms
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R
ΔTq
)k
X
k
X(R
G
i,Gn
1i W
i,W
)k
X
k
X(nR
G
G
W
i,W
)(G
G
k
XnR
For constant Xi
For kw>>kG
Foam is modeled as composite walls in series
XW,i XG,i
kW kG
Tq
q
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H. Lim et al, Express Polymer Letter, 2(3), 194-200 (2008.2)
Cell size vs thermal conductivity
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SamplesGlass mat
HR-450P HD-401HFC 365
mfcB 840
9PC 8 PMDI
G00 0
80 20 12 2 0.6 114.2G05 5
G10 10
G15 15
The formulation is based on 100 parts of the polyol by weight (pphp).HR-450P and HD-401: PPG having OH value of the number.HFC 365mfc (CF3CH2CF2CH3): Zero ODF blowing agent.PC 8: blowing catalyst. B8409: Silicon surfactant
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Figure 1. Density of PUF/glass fiber composites.
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Figure 2. SEM micrographs of PUF/glass fiber composites.
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Figure 3. Cell sizes and closed cell contents of PUF/glass fiber composites.
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Figure 6. Thermal conductivity of PUF/glass fiber composites.
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Figure 4. Compression strength of PUF/glass fiber composites.
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Figure 7. DSC thermograms of PUF/glass fiber composites(a) 0wt% (Tg: 126.7℃); (b) 5 wt% (Tg: 140.1℃); (c) 10 wt% (Tg: 143.4℃); (d) 15 wt% (Tg: 151.2℃).
Enter Project No: Project Title in Slide Master 27
Enter Project No: Project Title in Slide Master 28
CONCLUSIONS
Intensive works should be directed to reduce k bymolecular design of PU,cell size reduction and closed cell content increase….. along witheco-friendly, safety and sanitary designs---blowing agent, nonflammable, fungistatic and bacteriastatic agents,and retain or even reduce X by hybridization w/ inorganic materials.
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PublicationsInternational Journal (SCI)
1. S M Kang, M J Kim, S H Kwon, H Park, H M Jeong and B K Kim“Polyurethane foam/silica chemical hybrids for shape memory effects”J Mater Res, 27(22), 2012, pp 2837-2843.(GCRC solely acknowledged)
2. S M Kang, J H Park, S H Kwon, H Park, B K Kim
“Carbon Nanotube Reinforced Shape Memory Polyurethane Foam”Polym Bull, in press
(GCRC solely acknowledged)
EducationMS Graduates
J H Park, S J Lee, M J Kim
Open Project No 4: High Impact Polyurethane Foam
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