液晶/高分子混摻系統相分離及結晶化動力學之研究｜國立臺灣科技大學博碩士論文系統

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研究生：	江吉雄 Gi-Shiung Chiang
論文名稱：	液晶/高分子混摻系統相分離及結晶化動力學之研究 A study on kinetics of phase separation and crystallization in liquid crystal/polymer blending systems
指導教授：	洪伯達 Po-Da Hong
口試委員:	莊偉綜 Wei-Tsung Chuang 陳志堅 Jyh-Chien Chen 廖文彬 Wen-Bin Liau
學位類別：	碩士 Master
系所名稱：	工程學院 - 材料科學與工程系 Department of Materials Science and Engineering
論文出版年：	2008
畢業學年度：	96
語文別：	英文
論文頁數：	68
中文關鍵詞：	高分子、液晶、相分離、結晶化動力學
外文關鍵詞：	polymer, liquid crystal, phase separation, crystallization kinetics
相關次數：	點閱：311 下載：6
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上一筆

為瞭解8CB/PS和EBBA/PCL混摻系統的相變熱力學及動力學,我們分別以理論及實驗的方式建立了它們的相圖，我們以Flory-Huggins理論及Maier-Saupe理論分別來描述液-液混合及nematic相轉變的自由能變化，接著我們也透過POM觀察了8CB/PS相分離、EBBA/PCL中的PCL結晶及各液晶相的形態。在8CB/PS的SALS實驗中發現了兩個散射環分別代表一開始就相分離出來的小滴集團和後面才粗化才形成的較大集團，而這兩著環之間強度的重疊使其分析結果和理論預測不盡相同。以其最後形成的形態EBBA/PCL的morphology map可以分為(A)球晶生長區域；(B)EBBA之nematic相區域；(C)結晶化誘導nematic相區域；(D)nematic相誘導結晶化區域。在球晶生長區域EBBA分子存在於PCL球晶之Interlamellar區域內，在結晶化誘導nematic相區域中則有非線性的PCL結晶化行為。非線性的結晶化行為是因為EBBA/PCL(4/6)之混摻的濃度場改變了其局部過冷卻度，此濃度場在結晶化的初期影響並不顯著，此石的結晶化行為符合二次成核理論並在311K處有regimeIII到regimeII的轉變。

To understand the thermodynamics and kinetics of the phase transition of the system of 4'-octyl-4-cyanobiphenyl/Polystyrene (8CB/PS) blends and N-(4-Ethoxybe- nzylidene)-4’-butylaniline/poly(e-caprolactone) (EBBA/PCL), we have established the equilibrium phase diagrams theoretically and experimentally. Flory-Huggins theory and Maier-Saupe theory have been both taken into account to evaluate the free energy change of the phase transition of isotropic phases and also nematic liquid crystal. Morphology of the phase separation in 8CB/PS, crystal morphology in EBBA/ PCL and two liquid crytal phases were then investigated with polarized optical microscopy. Correlations between both initial small droplet domains and later bigger coarsening domains are found through small angle light scattering in 8CB/PS. Both domains exhibited one-dimensional growth behavior and formed a non-equilibrium structure. Overlap of the two rings made the phase behavior different from the theoretical prediction. The Morphology map for EBBA/PCL is separated into four regions: (A) Spherulite; (B) Nematic droplets; (C) Crystallization induces nematic transition; (D) Nematic transition induces crystallization. In spherulite region EBBA molecules existed in Interlamellar zone of PCL crystallite. Non-linear PCL crystallization occurred in Crystallization induces nematic transition region. Concentration field in EBBA/PCL system leads to the non-linear growth behavior and the change of local degree of undercooling. Concentration filed in crystallization early stage of EBBA/PCL (4/6) is not obvious and thus the growth behavior agrees with secondary nucleation theory, and a transition temperature from regime II to regime III was found at 311K.

Abstract	I
Thanks	II
Contents	IV
Directory of figures and tables	VI
Meaning of symbols	IX
Chapter 1  Preface	1
1-1  The phase behavior of blends of polymers	1
1-2  Liquid crystal	2
1-3  Blends of polymer with liquid crystal	4
1-4  Liquid-liquid phase separation	5
1-5  Small angle light scattering on the phase separation investigation	7
1-6  Morphology of blend system of crystalline/ amorphous polymer	8
1-8  Polymer crystallization dynamics	10
1-9  The effect self-generated field has on polymer crystallization	14
1-10  Small angle X-ray scattering analysis on microstructure of materials	15
1-11  Research objective	18
Chapter 2 Phase behavior and morphology of blends of small molecule liquid crystal and polymer	19
2-1  Introduction	19
2-2  Experiment	20
2-2-1  Material	20
2-2-2  Experiment method	21
2-3  Result and discusion	22
2-3-1  Heat analysis of the blend system	22
2-3-2  Establishment of phase diagram of blend system	26
2-3-3  Effect of composition to the morphology of polymer crystallite	41
2-3-4  Small angle X-ray analysis of micro-structure in blend system	44
Chapter 3 Study of phase separation kinetics in polymer/small molecule liquid crystal blend system	47
3-1  Introduction	47
3-2  Experiment	47
3-3  Result and discussion	48
Chapter 4 Study of polymer crystallization kinetics in blend system	54
4-1  Introduction	54
4-2  Experiment	54
4-3  Result and discussion	55
Chapter 5 Summary	65
Reference	67

                                

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