液晶嵌段共聚物PET/60PHB-b-PC的合成及结构与性能  

SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTALLINE BLOCK COPOLYMER PET/60PHB b PC

作　　者：张慧卿[1] 杜新宇[1] 刘德山[1] 周其庠[1] 

机构地区：[1]清华大学化工系

出　　处：《高分子学报》1998年第1期54-60,共7页Acta Polymerica Sinica

摘　　要：采用ＰＥＴ齐聚物的原位乙酰化法通过加入少量乙二醇（ＥＧ）合成了端羟基液晶聚合物ＰＥＴ／６０ＰＨＢ，并将其作为大单体，与双酚Ａ及碳酸二苯酯通过熔融酯交换法，进一步制得了液晶嵌段共聚物ＰＥＴ／６０ＰＨＢｂＰＣ．研究了合成规律，并借助粘度测定、ＤＳＣ、偏光显微镜、Ｘ光衍射和红外光谱分析等手段对合成的液晶嵌段共聚物进行了表征．研究表明，当ＰＥＴ齐聚物的ηｉｎｈ＝００５～００７ｄＬ／ｇ，Ａｃ２Ｏ／ＰＨＢ（ｍｏｌ／ｍｏｌ）＝１３，ＥＧ／ＰＥＴ（ｍｏｌ／ｍｏｌ）＝００６时能获得颜色、液晶性、溶解性均很好的端羟基液晶聚合物ＰＥＴ／６０ＰＨＢ，以此液晶聚合物为原料，采用合适的配方与工艺，能获得粘度较高、液晶性较好，并且熔体流动性很好的液晶嵌段共聚物ＰＥＴ／６０ＰＨＢｂＰＣ．通过偏光显微镜与Ｘ光衍射观察，证明此嵌段共聚物呈现向列型液晶织构，但其液晶态织构与纯ＰＥＴ／６０ＰＨＢ、ＰＥＴ／６０ＰＨＢ和ＰＣ的混合物明显不同．此外，还初步建立了用红外的分析手段鉴定液晶聚合物ＰＥＴ／６０ＰＨＢ端基的方法．Liquid crystal polymer segments with hydroxyl end group PET/60PHB were synthesized by in situ acetylation method in which the PET oligomer,p hydroxy benzoic acid and a little amount of EG were used.Then the liquid crystalline block copolymers PET/60PHB b PC were prepared by using LCP segment PET/60PHB obtained as a macromonomer and ester exchange synthetic technology of PC.The liquid crystalline block copolymers were also characterized by the aids of determination of inherent viscosity,DSC,polarizing microscope,X ray diffraction and FTIR etc..It is found that when the inherent viscosity of PET oligomer is 0 05～0 07dL/g,Ac 2O/PHB(mol/mol)=1 3,EG/PET(mol/mol)=0 06,the hydroxyl terminated LCPs PET/60PHB with light colour,good solubility and liquid crystalline properties can be obtained.The liquid crystalline block copolymers with high inherent viscosity and good liquid crystalline properties can be synthesized with above LCPs as a raw material through melt copolycondensation.It is indicated that the liquid crystalline block copolymers are nematic,but the texture of liquid crystalline state of the block copolymer is quite different from either the pure LCPs PET/60PHB or the mixture of PET/60PHB and PC.Furthermore,the analysis method of end group of LCP PET/60PHB is also established.

关 键 词：PET/60PHB PC 液晶嵌段共聚物 端基分析 

分 类 号：TB39[一般工业技术—材料科学与工程] O63[理学—高分子化学]