Trilayered Morphology of an ABC Triple Crystalline Triblock Terpolymer
文献类型：期刊论文
| 作者 | Palacios, Jordana K.1,2; Tercjak, Agnieszka3; Liu, Guoming4; Wang, Dujin4; Zhao, Junpeng5; Hadjichristidis, Nikos6; Muller, Alejandro J.1,2,7 |
| 刊名 | MACROMOLECULES
 |
| 出版日期 | 2017-09-26 |
| 卷号 | 50期号:18页码:7268-7281 |
| 英文摘要 | Triple crystalline triblock terpolymers are materials with remarkable semicrystalline superstructures. In this work, we report for first time the alternating triple lamellar morphology that self-assembles inside spherulites of a triblock terpolymer composed of poly(ethylene oxide) (PEO), poly(e-caprolactone) (PCL), and poly(L-lactide) (PLLA). The morphology of the PEO-b-PCL-b-PLLA triblock terpolymer is compared to an analogous PCL-b-PLLA diblock copolymer. Both diblock and triblock form a single phase in the melt. Two crystallization protocols were employed to create particular crystalline morphologies. In both cases, the isothermal crystallization of the PLA block is induced first (at 81 degrees C, a temperature above the melting points of both PCL and PEO blocks) and PLLA spherulites form a template, whereupon cooling the other two blocks can crystallize within the PLLA interlamellar spaces. WAXS analysis demonstrated the double crystalline and triple crystalline nature of the materials. The lamellar structure was evaluated by AFM observations and SAXS measurements. Moreover, theoretical SAXS curves of one-dimensional structural models were calculated. AFM micrographs of the triblock terpolymer evidenced the three different lamellae of PLLA, PCL and PEO that coexist together within the same spherulite. Three different lamellar thickness were determined, and their dimensions suggested that all blocks crystallized in chain-folded conformations. The evolution of the triple lamellar morphology during heating of tricrystalline samples was followed by in situ synchrotron SAXS measurements. The theoretical analysis of the SAXS.curves of the triblock terpolymer allowed us to propose a stacking morphological model, in which a particular trilayer structure exists, where one lamella of PCL or one lamella of PEO is inserted randomly between two adjacent PLLA lamellae. |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/41083]  |
| 专题 | 化学研究所_工程塑料实验室 |
| 作者单位 | 1.Univ Basque Country UPV EHU, POLYMAT, Donostia San Sebastian 20018, Spain 2.Univ Basque Country UPV EHU, Polymer Sci & Technol Dept, Fac Chem, Donostia San Sebastian 20018, Spain 3.Univ Basque Country UPV EHU, GMT, Dept Chem & Environm Engn, Fac Engn, Donostia San Sebastian 20018, Spain 4.Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China 5.South China Univ Technol, Fac Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China 6.KAUST, KAUST Catalysis Ctr, Phys Sci & Engn Div, Thuwal, Saudi Arabia 7.Basque Fdn Sci, Ikerbasque, Bilbao, Spain |
| 推荐引用方式 GB/T 7714 | Palacios, Jordana K.,Tercjak, Agnieszka,Liu, Guoming,et al. Trilayered Morphology of an ABC Triple Crystalline Triblock Terpolymer[J]. MACROMOLECULES,2017,50(18):7268-7281. |
| APA | Palacios, Jordana K..,Tercjak, Agnieszka.,Liu, Guoming.,Wang, Dujin.,Zhao, Junpeng.,...&Muller, Alejandro J..(2017).Trilayered Morphology of an ABC Triple Crystalline Triblock Terpolymer.MACROMOLECULES,50(18),7268-7281. |
| MLA | Palacios, Jordana K.,et al."Trilayered Morphology of an ABC Triple Crystalline Triblock Terpolymer".MACROMOLECULES 50.18(2017):7268-7281. |
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来源：化学研究所
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