聚乳酸体型开孔发泡材料的制备
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摘要
利用超临界二氧化碳(CO_2)发泡技术制备皮层开孔的聚合物发泡材料一直是个难题。本文创新性地选择超临界CO_2发泡技术和水滴模板法技术相结合,成功制备出皮层和内部均开孔的聚乳酸(PLA)体型开孔材料。实验结果表明,利用超临界CO_2发泡技术可以制备聚乳酸开孔发泡材料,通过改变发泡温度可实现内部孔径从8μm到32μm之间的调控。另一方面,利用水滴模板法技术可以进一步在聚乳酸发泡材料皮层形成开孔结构,通过简单的改变混合溶剂中氯仿和甲醇体积比,可以实现皮层孔径从2μm到6μm范围的调控。
To produce open and skinless polymer foams by using carbon dioxide(CO_2)foaming technology is apuzzle.In this work,CO_2 foaming technology and breath figures method were combined to prepare open and skinless polymer foams.The cell size in the range of 8~32μm in core zone of the foams could be adjusted by changing foaming temperature.On the other hand,porous structures on skin layer of foams were obtained by breath figures method.Moreover,by simply changing the volume ratio of chloroform and methanol,the porous size on skin layer could be altered from 2μm to 6μm.
To produce open and skinless polymer foams by using carbon dioxide(CO_2)foaming technology is apuzzle.In this work,CO_2 foaming technology and breath figures method were combined to prepare open and skinless polymer foams.The cell size in the range of 8~32μm in core zone of the foams could be adjusted by changing foaming temperature.On the other hand,porous structures on skin layer of foams were obtained by breath figures method.Moreover,by simply changing the volume ratio of chloroform and methanol,the porous size on skin layer could be altered from 2μm to 6μm.
引文
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[14]orisaki M,Ito T,Hayvai M,et al.Preparation of skinless polymer foam with supercritical carbon dioxide and its application to a photoinduced hydrogen evolution system[J].Polymer,2008,49:1611-1619.
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[2]Martina M,Hutmacher D W.Biodegradable polymers applied in tissue engineering research:a review[J].Polym.Int.,2007,56:145-157.
[3]祁冰,许志美,刘涛,等.超临界二氧化碳发泡制备可控形貌的聚乳酸微孔材料[J].高分子材料科学与工程,2010,26(3):138-141.Qi B,Xu Z M,Liu T,et al.Preparation of morphology-controllable microcellular polylactide acid by supercritical carbon dioxide[J].Polymer Materials Science&Engineering,2010,26(3):138-141.
[4]刘阳,史学涛,张广成,等.聚乳酸及其增韧共混体系超临界CO2发泡行为[J].高分子材料科学与工程,2015,31(4):61-67.Liu Y,Shi X T,Zhang G C,et al.Foaming process of polylactide and toughened polylactide blends using supercritical CO2[J].Polymer Materials Science&Engineering,2015,31(4):61-67.
[5]晏梦雪,周南桥.发泡工艺对超临界CO2/PLA微孔发泡泡孔形态的影响[J].塑料工业,2010,38(11):41-45.Yan M X,Zhou N Q.Effect of foaming technology on cell morphology in microcellular foaming of supercritical CO2/PLA[J].China Plastics Industry,2010,38(11):41-45.
[6]Rizvi A,Chu R K,Lee J H,et al.Superhydrophobic and oleophilic open-cell foams from fibrillar blends of polypropylene and polytetrafluoroethylene[J].Acs Appl.Mater.Interfaces,2014,6:21131-21140.
[7]Arora K A,And A J L,Mccarthy T J.Preparation and characterization of microcellular polystyrene foams processed in supercritical carbon dioxide[J].Macromolecules,1999,31:4614-4620.
[8]Kohlhoff D,Ohshima M.Open cell microcellular foams of polylactic acid(PLA)based blends with semi-interpenetrating polymer networks[J].Macromol.Mater.Eng.,2011,296:770-777.
[9]Xia L,Nawaby A V.Solvent free generation of open and skinless foam in poly(L-lactic acid)/poly(D,L-lactic acid)blends using carbon dioxide[J].Ind.Eng.Chem.Res.,2012,51:6722-6730.
[10]Boker A,Lin Y,Chiapperini K,et al.Hierarchical nanoparticle assemblies formed by decorating breath figures[J].Nat.Mater.,2004,3:302-306.
[11]Hernandez-Guerrero M,Stenzel M H.Honeycomb structured polymer films via breath figures[J].Polym.Chem.,2012,3:563-577.
[12]Lin C C,Co C C,Ho C C.Micropatterning proteins and cells on polylactic acid and poly(lactide--glycolide)[J].Biomaterials,2005,26:3655-3662.
[13]Bui V T,Ko S H,Choi H S.Large-scale fabrication of commercially available,nonpolar linear polymer film with a highly ordered honeycomb pattern[J].Acs Appl.Mater.Interfaces,2015,7:10541-10547.
[14]orisaki M,Ito T,Hayvai M,et al.Preparation of skinless polymer foam with supercritical carbon dioxide and its application to a photoinduced hydrogen evolution system[J].Polymer,2008,49:1611-1619.
[15]Wang S,Wang K,Pang Y,et al.Open-cell polypropylene/polyolefin elastomer blend foams fabricated for reusable oil-sorption materials[J].J.Appl.Polym.Sci.,2016,133:43812-43822.