Evolution of Reaction‐Induced Phase Segregations in Bi‐Soft Segment Urethane Oligomers,Macromolecular Chemistry and Physics

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Evolution of Reaction‐Induced Phase Segregations in Bi‐Soft Segment Urethane Oligomers
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-01-29 , DOI: 10.1002/macp.201900458
Christian Wenning ₁ , Annette M. Schmidt ₂ , Marc C. Leimenstoll ₁

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Oligomeric bi‐soft segment isocyanate‐terminated polyurethanes (ITPUs) are semi‐finished goods crucial for the fabrication of various polyurethane (PU) products such as foams, thermoplastics, adhesives, dispersions, and elastomers. Incompatibilities and thus phase segregation phenomena play an essential role in tailoring the properties of the final products. In this work, the evolution of reaction‐induced phase segregation (RIPS) in ITPUs is explored in terms of composition and morphology of the phase segregated products as well as competing second order kinetics of the reaction. The results suggest that mechanism and extent of the phase segregation are thermodynamically controlled following the ternary phase diagram of the reactants. A comprehensive description of the phase behavior during the reaction is provided demonstrating excellent control over the morphology of ITPUs by means of appropriate adjustment of the initial reactant composition. These results are fundamental for tailored morphology design as it is employed for instance in membrane synthesis.

中文翻译：

双软链段氨基甲酸酯低聚物中反应诱导相分离的演变

低聚双软链段异氰酸酯封端的聚氨酯（ITPU）是半成品，对制造各种聚氨酯（PU）产品（例如泡沫，热塑性塑料，粘合剂，分散体和弹性体）至关重要。不相容性以及因此的相分离现象在调整最终产品的性能中起着至关重要的作用。在这项工作中，从相分离产物的组成和形态以及反应的竞争性二级动力学方面探讨了ITPU中反应诱导相分离（RIPS）的演变。结果表明，根据反应物的三元相图，热力学控制了相分离的机理和程度。提供了反应期间相行为的全面描述，表明通过适当调整初始反应物组成，可以很好地控制ITPU的形态。这些结果对于例如在膜合成中采用的定制形态设计是基础的。

更新日期：2020-01-29

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