Influence of chlorotrifluoroethylene on crystal structure and polymer dynamics of poly(vinylidenefluoride-co-chlorotrifluoroethylene) antibacterial copolymers

IF 1.4 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY AIMS Materials Science Pub Date : 2023-01-01 DOI:10.3934/matersci.2023009
Wisatre Kongcharoensuntorn, Pornpen Atorngitjawat
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Abstract

The effect of chlorotrifluoroethylene (CTFE) on dynamic relaxations of poly(vinylidenefluoride-co-chlorotrifluoroethylene) films (P(VDF-CTFE)) containing 0, 10, 15 and 20% of CTFE was investigated via broadband dielectric spectroscopy (DRS) and dynamic mechanical analysis (DMA). The interpretation was accompanied by the crystal structure obtained from Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, small-angle X-ray scattering and differential scanning calorimetry. Increment of CTFE contents caused reducing the degree of crystallinity but did not impact the long period, lamellar thickness, and amorphous layer thickness. Four dynamic processes were clearly observed in DRS spectra for the neat poly(vinylidene fluoride) and P(VDF-CTFE) which were attributed to the local motion of amorphous chains (β), the segmental relaxation of amorphous chains (α1), the local conformational rearrangement of the TGTGʹ conformation (α2) and the process associated with Maxwell–Wagner–Sillars interfacial polarization (αMWS). The extra relaxation was observed for P(VDF-CTFE), which was more likely associated to the molecular motion of CTFE chain segments (αc), correspondent with DMA results. These PVDF and P(VDF-CTFE) conducted as self-antibacterial materials.
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三氟氯乙烯对聚偏氟乙烯-共三氟氯乙烯抗菌共聚物晶体结构和聚合物动力学的影响
采用宽带介电光谱(DRS)和动态力学分析(DMA)研究了三氟氯乙烯(CTFE)对含0、10、15和20%的聚偏氟乙烯-共三氟氯乙烯(P(VDF-CTFE))薄膜动态弛豫的影响。通过傅里叶变换红外光谱、广角x射线衍射、小角x射线散射和差示扫描量热法获得晶体结构。CTFE含量的增加导致结晶度降低,但对长周期、片层厚度和非晶层厚度没有影响。纯聚偏氟乙烯(VDF-CTFE)和聚偏氟乙烯(VDF-CTFE)在DRS光谱中观察到四个动力学过程:非晶链的局部运动(β)、非晶链的节段弛豫(α1)、TGTG +构象的局部构象重排(α2)和与Maxwell-Wagner-Sillars界面极化(αMWS)相关的过程。P(VDF-CTFE)有额外的弛豫,这更可能与CTFE链段(αc)的分子运动有关,与DMA结果一致。这些PVDF和P(VDF-CTFE)作为自抗菌材料进行。
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来源期刊
AIMS Materials Science
AIMS Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
0.00%
发文量
33
审稿时长
4 weeks
期刊介绍: AIMS Materials Science welcomes, but not limited to, the papers from the following topics: · Biological materials · Ceramics · Composite materials · Magnetic materials · Medical implant materials · New properties of materials · Nanoscience and nanotechnology · Polymers · Thin films.
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