Baibarac M, Nila A, Smaranda I, Stroe M, Stingescu L, Cristea M, Cercel R C, Lorinczi A, Ganea P, Mercioniu I, Ciobanu R, Schreiner C, Garcia R G, Bartha C
National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania.
National Institute of Materials Physics, Atomic Structures and Defects in Advanced Materials Laboratory, Atomistilor street 405A, P.O. Box MG-7, R077125 Bucharest, Romania.
Materials (Basel). 2021 Feb 5;14(4):753. doi: 10.3390/ma14040753.
In this work, new films containing composite materials based on blends of thermoplastic polymers of the polyurethane (TPU) and polyolefin (TPO) type, in the absence and presence of BaTiO nanoparticles (NPs) with the size smaller 100 nm, were prepared. The vibrational properties of the free films depending on the weight ratio of the two thermoplastic polymers were studied. Our results demonstrate that these films are optically active, with strong, broad, and adjustable photoluminescence by varying the amount of TPU. The crystalline structure of BaTiO and the influence of thermoplastic polymers on the crystallization process of these inorganic NPs were determined by X-ray diffraction (XRD) studies. The vibrational changes induced in the thermoplastic polymer's matrix of the BaTiO NPs were showcased by Raman scattering and FTIR spectroscopy. The incorporation of BaTiO NPs in the matrix of thermoplastic elastomers revealed the shift dependence of the photoluminescence (PL) band depending on the BaTiO NP concentration, which was capable of covering a wide visible spectral range. The dependencies of the dielectric relaxation phenomena with the weight of BaTiO NPs in thermoplastic polymers blends were also demonstrated.
在这项工作中，制备了新型薄膜，其包含基于聚氨酯（TPU）和聚烯烃（TPO）类型的热塑性聚合物共混物的复合材料，且有无尺寸小于100nm的BaTiO纳米颗粒（NPs）。研究了取决于两种热塑性聚合物重量比的自由薄膜的振动特性。我们的结果表明，这些薄膜具有光学活性，通过改变TPU的量可产生强烈、宽泛且可调节的光致发光。通过X射线衍射（XRD）研究确定了BaTiO的晶体结构以及热塑性聚合物对这些无机NPs结晶过程的影响。通过拉曼散射和傅里叶变换红外光谱（FTIR）展示了BaTiO NPs在热塑性聚合物基体中引起的振动变化。在热塑性弹性体基体中加入BaTiO NPs揭示了光致发光（PL）带的位移取决于BaTiO NP浓度，其能够覆盖宽的可见光谱范围。还证明了热塑性聚合物共混物中电介质弛豫现象与BaTiO NPs重量的相关性。
