Smart Core-Shell Microgel for Dehumidifying Membrane: Synthesis, Characterization and Performance

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研究生：	Oka Pradipta Arjasa Oka - Pradipta Arjasa
論文名稱：	Smart Core-Shell Microgel for Dehumidifying Membrane: Synthesis, Characterization and Performance Smart Core-Shell Microgel for Dehumidifying Membrane: Synthesis, Characterization and Performance
指導教授：	林析右 Shi-Yow Lin 陳崇賢 Chorng-Shyan Chern
口試委員:	洪儒生 Lu-Sheng Hong
學位類別：	碩士 Master
系所名稱：	工程學院 - 化學工程系 Department of Chemical Engineering
論文出版年：	2012
畢業學年度：	100
語文別：	英文
論文頁數：	67
外文關鍵詞：	smart material, microgel, N-isopropylacrylamide, dehumidifying membrane, water uptake, fast regeneration.
相關次數：	點閱：141 下載：1
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High relative humidity of indoor air will tend to increase the risk of health problems. The indoor humidity level can be controlled by using dehumidifying devices. Incorporating nano particle and smart materials into the dehumidifying devices can improve the efficiency and the performance of the devices. The properties of microgels which enable them to undergo such changes under a controlled condition put them into the category of smart materials. Smart materials basically are materials that have one or more properties that can be significantly changed in a controlled fashion by external stimuli, such as stress, temperature, moisture, pH, electric or magnetic fields.
In this study two different core-shell microgels were synthesized and characterized. The performance being a dehumidifying membrane was tested. The parameters affecting the core-shell synthesis were studied and optimized. The crosslinked microgel of poly(N-isopropylacrylamide co methylacrylic acid) (P(NIPAM-co-MAA) was used as shell. Two different cores, P(MMA-co-2-EHA) and silica nanopartices (SNs) were used.
The synthesis condition for relatively high solids content core-shell microgel suspension of about 15 wt% solids content was optimized. The SNs in this study was synthesized using diethylenetriamine (DETA) as the weak base and resulted in good stability during the synthesis process in aqueous phase. The method used was able to get as high as 10 wt% of solid content of around 100-150 nm SNs with relatively narrow particle size distribution. The SNs produced was then used as the second core.
High crosslink density of polymer core-shell microgels (5 wt% BIS) and SNs inverted core-shell microgel (3 wt% BIS) as dehumidifying membranes have better performance compare to other materials found during the literature search. Relatively high absorption rate, good water uptake and fast regeneration was observed.

Abstract	...........................................................i
List of Figures	..........................................................iv
List of Tables	.........................................................vii
I.	Introduction	...................................................1
I.1.	How Indoor Humidity Affecting Human’s Life	...................1
I.2.	Smart Material of Microgel/Nanogel	...........................2
I.3.	Aims of the Investigation	...................................3
II.	Literature Survey	...........................................5
II.1.	Colloid	...........................................................5
II.2.	Emulsion and Polymerization	...................................7
II.2.1.	Surfactant	...................................................8
II.2.2.	Emulsion Polymerization	..........................................11
II.2.3.	Miniemulsion Poymerization	..................................12
II.2.4.	Microemulsion Polymerization	..................................13
II.3.	Seeded dispersion Polymerization	..........................13
II.3.1.	Fundamental Knowledge	..........................................13
II.3.2.	Hybrid Inorganic/Organic Core-Shell	..........................15
II.4.	Microgel Suspension	..........................................17
III.	Experimental Techniques	..........................................20
III.1.	Seed Latex Synthesis	..........................................20
III.1.1.	Materials	..........................................20
III.1.2.	Synthesis Procedures	..................................20
III.2.	The Core-Shell Particles Synthesis	..........................21
III.2.1.	Materials	..........................................21
III.2.2.	Synthesis procedures	..................................21
III.2.3.	Experimental set up	..................................22
III.3.	The Silica Nanoparticles Synthesis and Surface Modification	..23
III.3.1.	Materials	..........................................23
III.3.2.	Synthesis Procedures	..................................23
III.3.3.	Experimental set up	..................................25
III.4.	Membrane Dehumidifying Performance	..........................26
III.4.1.	Materials	..........................................26
III.4.2.	Experiments procedures	..................................26
III.4.3.	Dehumidification chamber	..........................28
III.5.	Instruments	..................................................28
IV.	Result and Discussion	..........................................29
IV.1.	High Solids Content Colloidal Thermoresponsive Core-Shell
        Particles	..................................................29
IV.1.1.	The seed particles synthesis	..................................29
IV.1.2.	The core-shell synthesis: the effect of different cross-linker
        concentration.....................................................30
IV.1.3.	The core-shell synthesis: the effect of different surfactant
        concentration	..................................................34
IV.1.4.	The core-shell synthesis: the effect of different monomer to seed
        ratio	..........................................................36
IV.2.	High Solid Content Silica Nanoparticles in Aqueous Phase	..38
IV.2.1.	The Effect of Cosolvent	  ........................................39
IV.2.2.	The Effect of DETA Concentration	..........................41
IV.2.3.	The Synthesis of High Solid Content SNs: The Effect of TEOS
        Concentration	..................................................43
IV.2.4.	The Core-Shell Microgel Synthesis Using SNs as the Seed	..........46
IV.3.	The Core-Shell Microgels Behavior (Swelling/Deswelling; Phase
        Transition) and Their Performance as Dehumidifying Membrane	..47
IV.3.1.	The Swelling/Deswelling Behaviour	..........................48
IV.3.2.	The LCST Behaviour	..........................................55
IV.3.3.	The Core-Shell Microgel Performance as Dehumidifying Membrane	..55
V.	Conclusion	..................................................60
VI.	References	..................................................61

                                

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