Azpitarte Itxasne, Botta Gabriele A, Tollan Christopher, Knez Mato
CIC nanoGUNE BRTA Tolosa Hiribidea 76 20018 Donostia-San Sebastián Spain
IKERBASQUE, Basque Foundation for Science 48011 Bilbao Spain.
RSC Adv. 2020 Apr 22;10(27):15976-15982. doi: 10.1039/d0ra02073g. eCollection 2020 Apr 21.
The physical properties of polymers can be significantly altered by blending them with inorganic components. This can be done during the polymerization process, but also by post-processing of already shaped materials, for example through coating by atomic layer deposition (ALD) or hybridizing through vapor phase infiltration (VPI), both of which are beneficial in their own way. Here, a new processing strategy is presented, which allows distinct control of the coating and infiltration. The process is a hybrid VPI and ALD process, allowing separate control of infiltrated and coated components. This new simultaneous vapor phase coating and infiltration process (SCIP) enhances the degrees of freedom for optimizing the properties of polymers, as shown on the example of Kevlar 29 fibers. The SCIP treated fibers show an increase of 17% of their modulus of toughness (MOT) in comparison to native Kevlar, through the nanoscale coating with alumina. At the same time their intrinsic sensitivity to 24 hours UV-irradiation was completely suppressed through another infiltrated material, zinc oxide, which absorbs the UV irradiation in the subsurface area of the fibers.
通过将聚合物与无机成分混合，其物理性能可得到显著改变。这可以在聚合过程中完成，也可以通过对已成型材料进行后处理来实现，例如通过原子层沉积（ALD）进行涂层或通过气相渗透（VPI）进行杂化，这两种方法各有其优势。在此，提出了一种新的加工策略，该策略能够对涂层和渗透进行精确控制。该工艺是一种VPI和ALD混合工艺，可分别控制渗透和涂层成分。这种新的同时气相涂层和渗透工艺（SCIP）增加了优化聚合物性能的自由度，以凯夫拉尔29纤维为例进行了展示。经过SCIP处理的纤维与天然凯夫拉尔相比，通过氧化铝纳米级涂层，其韧性模量（MOT）提高了17%。同时，通过另一种渗透材料氧化锌，其对24小时紫外线辐射的固有敏感性被完全抑制，氧化锌在纤维的次表面区域吸收紫外线辐射。
