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Revealing Interfacial Interactions in Random Copolymer Adsorbed Layers by Solvent Leaching.
Macromolecular Rapid Communications ( IF 4.6 ) Pub Date : 2020-02-09 , DOI: 10.1002/marc.201900582
Mary J B Davis 1 , Katelyn Randazzo 1 , Biao Zuo 1, 2 , Rodney D Priestley 1, 3
Affiliation  

Annealing a supported polymer film in the melt state results in the growth of an irreversibly adsorbed layer, which has been shown to influence thin film properties such as diffusion and glass transition temperature. Adsorbed layer growth is attributed to many simultaneous interactions between individual monomer units and the substrate, stabilizing chains against desorption. In this study, adsorbed layers of polystyrene (PS), poly(methyl methacrylate) (PMMA), and their random copolymers are isolated by select solvents. While PS adsorbed layer thickness is largely unaffected by the choice of washing solvent, the PMMA adsorbed layer completely desorbs when washed with tetrahydrofuran and chloroform, as opposed to toluene. Scaling relationships between adsorbed layer thickness and degree of chain adsorption at the substrate enable the use of adsorbed layer thickness to probe specific polymer-substrate interactions. Composition-dependent desorption trends indicate non-preferential adsorption between styrene and methyl methacrylate repeat units at the substrate, despite differences in substrate interaction strength. This insight contributes to the developing mechanism for the adsorption of random copolymers during melt-state annealing, further extending the ability to predict processing-inducted changes to the properties of polymer thin films to heterogeneous systems.

中文翻译:

通过溶剂浸出揭示无规共聚物吸附层中的界面相互作用。

对处于熔融状态的负载型聚合物薄膜进行退火会导致不可逆吸附层的生长,这已显示出会影响薄膜性能,例如扩散和玻璃化转变温度。吸附层的生长归因于各个单体单元与底物之间的许多同时相互作用,从而稳定了链的解吸。在这项研究中,聚苯乙烯(PS),聚(甲基丙烯酸甲酯)(PMMA)及其无规共聚物的吸附层通过选择溶剂分离。尽管PS吸附层的厚度在很大程度上不受洗涤溶剂的选择的影响,但与甲苯相反,当用四氢呋喃和氯仿洗涤时,PMMA吸附层完全脱附。吸附层厚度和基材上链吸附度之间的比例关系使得能够使用吸附层厚度来探测特定的聚合物-基材相互作用。取决于成分的解吸趋势表明,尽管底物相互作用强度有所不同,但苯乙烯和甲基丙烯酸甲酯重复单元之间在底物上的吸附不是优选的。这一见解有助于在熔融态退火过程中吸附无规共聚物的机理,进一步扩展了预测由加工引起的聚合物薄膜性能变化的能力。取决于成分的解吸趋势表明,尽管底物相互作用强度有所不同,但苯乙烯和甲基丙烯酸甲酯重复单元之间在底物上的吸附不是优选的。这一见解有助于在熔融态退火过程中吸附无规共聚物的机理,进一步扩展了预测由加工引起的聚合物薄膜性能变化的能力。取决于成分的解吸趋势表明,尽管底物相互作用强度有所不同,但苯乙烯和甲基丙烯酸甲酯重复单元之间在底物上的吸附不是优选的。这种见解有助于在熔融态退火过程中吸附无规共聚物的发展机理,进一步扩展了预测由加工引起的聚合物薄膜性能变化的能力。
更新日期:2020-02-10
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