Sequential crystallization and morphology of triple crystalline biodegradable PEO-b-PCL-b-PLLA triblock terpolymers

	Sequential crystallization and morphology of triple crystalline biodegradable PEO-b-PCL-b-PLLA triblock terpolymers
	Palacios, Jordana K.1; Mugica, Agurtzane 1; Zubitur, Manuela 2; Iturrospe, Amaia 3; Arbe, Arantxa 3; Liu, Guoming 4; Wang, Dujin 4; Zhao, Junpeng 5; Hadjichristidis, Nikos 5; Mueller, Alejandro J.1,6
刊名	RSC ADVANCES
	2016
卷号	6 期号:6 页码:4739-4750
英文摘要	The sequential crystallization of poly(ethylene oxide)-b-poly(epsilon-caprolactone)-b-poly(L-lactide) (PEO-b-PCL-b-PLLA) triblock terpolymers, in which the three blocks are able to crystallize separately and sequentially from the melt, is presented. Two terpolymers with identical PEO and PCL block lengths and two different PLLA block lengths were prepared, thus the effect of increasing PLLA content on the crystallization behavior and morphology was evaluated. Wide angle X-ray scattering (WAXS) experiments performed on cooling from the melt confirmed the triple crystalline nature of these terpolymers and revealed that they crystallize in sequence: the PLLA block crystallizes first, then the PCL block, and finally the PEO block. Differential scanning calorimetry (DSC) analysis further demonstrated that the three blocks can crystallize from the melt when a low cooling rate is employed. The crystallization process takes place from a homogenous melt as indicated by small angle X-ray scattering (SAXS) experiments. The crystallization and melting enthalpies and temperatures of both PEO and PCL blocks decrease as PLLA content in the terpolymer increases. Polarized light optical microscopy (PLOM) demonstrated that the PLLA block templates the morphology of the terpolymer, as it forms spherulites upon cooling from the melt. The subsequent crystallization of PCL and PEO blocks occurs inside the interlamellar regions of the previously formed PLLA block spherulites. In this way, unique triple crystalline mixed spherulitic superstructures have been observed for the first time. As the PLLA content in the terpolymer is reduced the superstructural morphology changes from spherulites to a more axialitic-like structure.
收录类别	SCI
语种	英语
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/30137]
专题	化学研究所_工程塑料实验室
作者单位	1.Univ Basque Country UPV EHU, Fac Chem, POLYMAT & Polymer Sci & Technol Dept, Paseo Manuel Lardizabal 3, Donostia San Sebastian 20018, Spain 2.Univ Basque Country UPV EHU, Polytech Sch, Chem & Environm Engn Dept, Donostia San Sebastian 20018, Spain 3.Mat Phys Ctr MPC, Ctr Fis Mat CSIC UPV EHU, Paseo Manuel Lardizabal 5, 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.KAUST, KAUST Catalysis Ctr, Phys Sci & Engn Div, Thuwal, Saudi Arabia 6.Basque Fdn Sci, IKERBASQUE, Bilbao, Spain
推荐引用方式 GB/T 7714	Palacios, Jordana K.,Mugica, Agurtzane,Zubitur, Manuela,et al. Sequential crystallization and morphology of triple crystalline biodegradable PEO-b-PCL-b-PLLA triblock terpolymers[J]. RSC ADVANCES,2016,6(6):4739-4750.
APA	Palacios, Jordana K..,Mugica, Agurtzane.,Zubitur, Manuela.,Iturrospe, Amaia.,Arbe, Arantxa.,...&Mueller, Alejandro J..(2016).Sequential crystallization and morphology of triple crystalline biodegradable PEO-b-PCL-b-PLLA triblock terpolymers.RSC ADVANCES,6(6),4739-4750.
MLA	Palacios, Jordana K.,et al."Sequential crystallization and morphology of triple crystalline biodegradable PEO-b-PCL-b-PLLA triblock terpolymers".RSC ADVANCES 6.6(2016):4739-4750.