Composite Materials: Excellent Nanofiber Adhesion for Hybrid Polymer Materials with High Toughness Based on Matrix Interdiffusion During Chemical Conversion (Adv. Funct. Mater. 8/2019)
Composite Materials: Excellent Nanofiber Adhesion for Hybrid Polymer Materials with High Toughness Based on Matrix Interdiffusion During Chemical Conversion (Adv. Funct. Mater. 8/2019)
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复合材料：基于化学转化过程中基体相互扩散的高韧性混合聚合物材料优异的纳米纤维粘合力（Adv. Functiont. Mater. 8/2019）
DOI：
10.1002/adfm.201970051
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发表时间：
2019
影响因子：
19
通讯作者：
K. Clerck
中科院分区：
文献类型：
--
作者：
L. Daelemans;W. Paepegem;Dagmar R. D’hooge;K. Clerck
多相材料面临的挑战之一是提高其不同相的互连性。实现优异粘合力的一个有前途的途径是分子相互扩散，其中分子转移以实现物理相互作用。在目前的工作中，开发了一种新颖的直接方法来调节电纺纳米纤维与其基质之间的粘附力，从分子扩散的基本见解出发，并考虑其中一个聚合物相的原位化学形成，以有效调节相互扩散。在固化诱导形成热固性基质（环氧树脂）过程中，为热塑性相（聚（ε-己内酯））与热固性基质（环氧树脂）的粘附提供了概念验证。对于等温固化，只需中间温度 (50 °C) 即可生产出成分之间具有良好粘附力并保留纳米形态的纳米纤维杂化材料。此外，如果采用两步固化（25°C/80°C）或同轴静电纺丝（聚酰胺6/聚（ε-己内酯））来实现核壳纳米形态，则可以获得优异的粘合性能。由于热塑性纳米纤维与基体的良好粘合，优化的相互扩散材料的韧性得到了改善，G 值超过 600 J m−2（高达 65% 的改善）。
One of the challenges for multiphase materials is the improvement of the interconnectivity of their separate phases. A promising route toward excellent adhesion is molecular interdiffusion, in which molecules are transferred to enable physical interaction. In the present work, a novel straightforward and direct method is developed to tune the adhesion between electrospun nanofibers and their matrix, starting from fundamental insights on molecular diffusion and considering in situ chemical formation of one of the polymer phases to effectively regulate interdiffusion. Proof‐of‐concept is provided for the adhesion of a thermoplastic phase (poly(ε‐caprolactone)) to a thermoset matrix (epoxy) during the cured‐induced formation of the latter. For isothermal curing, only an intermediate temperature (50 °C) allows the production of nanofiber hybrid materials with good adhesion between the constituents and preservation of the nanomorphology. Moreover, excellent adhesion properties are obtained in case a two‐step curing (25 °C/80 °C), or coaxial electrospinning (polyamide 6/poly(ε‐caprolactone)) toward core–shell nanomorphologies is applied. Improvements in toughness of the optimized interdiffused materials withGvalues over 600 J m−2(up to 65% improvement) are recorded due to excellent bonding of the thermoplastic nanofibers with the matrix.