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Manipulation of Crystallization Sequence in PEO-b-PCL Films Using Solvent Interactions
Macromolecules ( IF 5.5 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acs.macromol.7b02004
Natasha Brigham 1 , Christopher Nardi 1 , Allison Carandang 1 , Kristi Allen 1 , Ryan M. Van Horn 1
Affiliation  

The physical structure of polymer films is important for understanding the observed macroscopic properties. In crystalline–crystalline block copolymers, the hierarchical nature of assembly is even more influential. Controlling this assembly process is crucial for tailoring film properties. In materials where crystallization of each block occurs nearly simultaneously, the ability to manipulate crystallization order is desirable. Poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) films were monitored via ATR-FTIR to determine the crystallization order during drying from varying solvents. PCL crystallized first from most solvents except toluene and ethyl acetate, where PEO nucleation occurred first. Moreover, after melting the sample to remove solvent–polymer interaction effects, PCL was first to crystallize from the melt, as has been previously reported. Differences in the films’ morphologies based on crystallization order were observed using polarized optical microscopy. These results demonstrate that the order of crystallization and the assembly within the film were controllable when casting symmetric diblock PEO-b-PCL films from different solvents.

中文翻译:

PEO - b- PCL薄膜中溶剂相互作用的结晶序列调控

聚合物膜的物理结构对于理解所观察到的宏观性能很重要。在晶体-晶体嵌段共聚物中,组装的层级性质更具影响力。控制该组装过程对于调整薄膜性能至关重要。在每个嵌段的结晶几乎同时发生的材料中,需要具有控制结晶顺序的能力。聚环氧乙烷-b-聚ε-己内酯(PEO- b-PCL)薄膜通过ATR-FTIR进行监控,以确定从不同溶剂干燥过程中的结晶顺序。PCL首先从除甲苯和乙酸乙酯之外的大多数溶剂中结晶,其中首先发生PEO成核。此外,如先前所报道,在熔化样品以消除溶剂-聚合物相互作用影响之后,PCL首先从熔体中结晶出来。使用偏振光学显微镜观察了基于结晶顺序的膜形态的差异。这些结果表明,当用不同的溶剂流延对称的二嵌段PEO - b- PCL薄膜时,薄膜中的结晶顺序和组装是可控制的。
更新日期:2017-11-07
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