Frauenklinik der Technischen Universität München

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    Review on recycling of carbon fibre reinforced thermoplastics with a focus on polyetheretherketone

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    Addressing the waste management of carbon fibre-reinforced thermoplastics, we review the different recycling routes, emphasising the mechanical recycling route of carbon fibre-reinforced polyetheretherketone (CF-PEEK). The most promising scheme for CF-PEEK is mechanical comminution, followed by long fibre-reinforced thermoplastics compression moulding. The main reasons are cost-efficiency and low environmental impacts, as it preserves the valuable matrix while enabling good mechanical properties. In this paper, we discuss the mechanical recycling route in general and then focus on the compression moulding step. Furthermore, we explore the effect on the mechanical properties to gain insights into potential fields of application for the mechanically recycled CF-PEEK. We also review the effect of CF-PEEK chemical degradation arising during compression moulding on the overall properties of the recyclate. Understanding the mechanisms and changes in the fibre, matrix and fibre-matrix interface during recycling is crucial for optimising the process and maximising the number of recycling cycles

    Proinflammatory pattern in the lower airways of non-asthmatic obese adolescents.

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    BACKGROUND: Obesity is known to be a pro-inflammatory condition affecting multiple organs. Obesity as a systemic pro-inflammatory state, might be associated with bronchial inflammation in non-smoking adolescents with a BMI ≥ 30 kg/m2 without evidence of concomitant chronic diseases. MATERIALS AND METHODS: We studied non-asthmatic obese patients (n = 20; median age 15.8 years; BMI 35.0 kg/m2) compared to age matched healthy control subjects (n = 20; median age 17.5 years; BMI 21.5 kg/m2). Induced sputum differential cell counts and sputum mRNA levels were assessed for all study subjects. Serum levels of CRP, IL-6, and IL-8 were measured. Further, IL-5, IL-6, IL-8, IL-13, IL-17, TNF-α, IFN-γ, and IP-10 protein levels were analyzed in induced sputum was. RESULTS: Serum CRP levels, sputum inflammatory cell load and sputum eosinophils differed significantly between obese and non-obese subjects, for sputum neutrophils, a correlation was shown with BMI ≥ 30 kg/m2. Differences were also observed for sputum mRNA expression of IL6, IL8, IL13, IL17, IL23, and IFN-γ, as well as the transcription factors T-bet, GATA3, and FoxP3. CONCLUSIONS: Increased bronchial inflammation, triggered by systemic or local inflammatory effects of obesity itself, may account for the higher rates of airway disease in obese adolescents

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