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Eco-friendlier and sustainable natural-based additives for poly(vinyl chloride)-based composites
Sofia Marceneiro,Irene Lobo,Isabel Dias,Elizabete de Pinho,Ana M.A. Dias,Hermínio C. de Sousa 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
This work presents novel natural-based and solvent-free additives for poly(vinyl chloride) (PVC), namelycalcium soaps, obtained for the first time from naturally occurring epoxidized soybean and linseed oils(ESO/ELO); and biogenic calcium carbonate, obtained from chicken eggshells (EG) after different acidand/or thermal pre-treatments. Results show that these additives were able to: i) reduce the concentrationof volatile organic compounds released from PVC films, including alcohols, aldehydes, esters andphthalates (97,95,90 and 84% chromatographic peak area reduction, respectively), originating safer materials;ii) improve the long-term thermal stability of PVC-based materials, while maintaining theirmechanical performance and when compared to control samples formulated with a high-performancecommonly employed solvent-based thermal stabilizer. Films formulated with ESO-based calcium soapsand with EG powders treated with acid and thermal treatment (200 C) presented the best performancein terms of heat aging and long-term thermal stability. The former also slightly improved the thermomechanicalproperties of the films indicating that these additives are also working as secondary plasticizersfor PVC. This work gives an important contribution towards the safety and sustainability of highperformancePVC-based materials, by allowing the substitution of commercially available thermal stabilizersby new eco-friendlier and safer alternatives obtained from renewable sources.
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Juliana de Freitas Leite,Guilherme Antonio Rago Lobo,Paulo Martin Nowak,Irene Reali Antunes,Edward Araujo Júnior,David Baptista da Silva Pares 대한산부인과학회 2019 Obstetrics & Gynecology Science Vol.62 No.6
ObjectiveTo evaluate the performance of the preeclampsia (PE) screening algorithm of the Fetal Medicine Foundation (FMF)during the first trimester in a Brazilian population using maternal characteristics, mean arterial pressure (MAP), anduterine artery Doppler data. MethodsThis is a prospective cohort study that evaluated 701 pregnant women during the first trimester ultrasound screeningfor chromosomal abnormalities (11–13+6 weeks). All patients provided information regarding clinical and obstetrichistory, MAP, and mean uterine artery pulsatility index (mean PI). Patients were assigned to four groups based on thepresence of PE and gestational age at delivery: group 1 (control), patients without hypertensive disorders (n=571);group 2, PE and delivery before 34 weeks of gestation (n=7); group 3, PE and delivery before 37 weeks of gestation,including patients from group 2 and patients that presented PE with delivery between 34 and 37 weeks (n=17); andgroup 4, PE and delivery before 42 weeks of gestation, including patients from both groups 2 and 3 and patients thatpresented PE with delivery between 37 and 42 weeks of gestation (n=34). ResultsAfter the exclusion of 96 patients, we evaluated the data of 605 patients. By combining maternal characteristics, MAP,and the mean uterine artery PI for the detection of PE, we found a sensitivity of 71.4% in group 2, 50% in group 3,and 41.2% in group 4 (false positive rate=10%). ConclusionUsing maternal characteristics, MAP, and uterine artery Doppler data, we were able to identify a significantproportion of patients who developed preterm PE.
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