Property enhancement of healable supramolecular polyurethanes
Property enhancement of healable supramolecular polyurethanes
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DOI：
10.1016/j.eurpolymj.2019.05.042
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发表时间：
2019-09
影响因子：
6
通讯作者：
S. Salimi;L. Hart;A. Feula;D. Hermida-Merino;A. Touré;E. Kabova;L. Ruiz-Cantu;D. Irvine;R. Wildman;K. Shankland;W. Hayes
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文献类型：
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作者：
S. Salimi;L. Hart;A. Feula;D. Hermida-Merino;A. Touré;E. Kabova;L. Ruiz-Cantu;D. Irvine;R. Wildman;K. Shankland;W. Hayes
低分子量添加剂可以通过互补氢键相互作用与超分子聚氨酯协同自组装，为增强可寻址聚合物网络的性能提供了一条有吸引力的途径。在这里，我们提出的设计，合成，表征和机械性能的一系列超分子聚氨酯与不同负载的低分子量双脲添加剂。这些添加剂能够与超分子聚氨酯内的类似识别基序自组装以形成极性“硬”域，促进材料内的相分离，并且至关重要的是，增加聚合物网络的强度。此外，双脲添加剂是聚合反应中的副产物，因此可以原位合成，而不需要复杂的纯化或共混。这些增强的聚合物的机械性能相比，原始的超分子聚氨酯单独增强，作为一个结果，在聚合物基体内的更高程度的秩序。此外，制备包含与超分子聚氨酯共混的小分子的制剂以检查材料制备和填料在聚合物基质内分散的效果。有趣的是，共混材料的机械性能由于适度分散和并入聚合物基质中而降低。因此，这些发现证明了一种简便的一锅法，该方法不需要纯化来生产增强的超分子聚氨酯。该方法可用于工业应用中，其中通过在聚合中原位合成低分子量添加剂可以容易地实现物理和机械性能的增强。
Low molecular weight additives which can cooperatively self-assemble with supramolecular polyurethanes via complementary hydrogen bonding interactions offer an attractive route to enhancing the properties of addressable polymer networks. Here, we present the design, synthesis, characterisation and mechanical properties of a series of supramolecular polyurethanes with varied loadings of a low molecular weight bis-urea additive. These additives are able to self-assemble with analogous recognition motifs within the supramolecular polyurethanes to form polar ‘hard’ domains, promoting phase separation within the material and, crucially, increasing the strength of the polymer network. In addition, the bis-urea additive is a by-product within the polymerisation and thus can be synthesisedin situ, without the need for complex purification or blending. The mechanical properties of these reinforced polymers were enhanced when compared to the pristine supramolecular polyurethane alone, as a result of higher degrees of order within the polymer matrix. Furthermore, a formulation comprising the small molecule blended with the supramolecular polyurethane was produced to examine the effect of material preparation and filler dispersion within the polymer matrix. Interestingly, the mechanical performance of a blended material was diminished as a result of modest dispersion and incorporation within the polymer matrix. These findings thus demonstrate a facile, one-pot, method that does not require purification to produce reinforced supramolecular polyurethanes. This methodology may find use in industrial applications in which enhancements to the physical and mechanical properties can be easily achieved through thein situsynthesis of low molecular weight additives within the polymerisation.