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International Journal of Biological... May 2023Polypropylene grafted calcium alginate with mesoporous silica (PP-g-CaAlg@SiO) for adsorbing Bisphenol A (BPA) and Pb was prepared by calcium chloride (CaCl)...
Polypropylene grafted calcium alginate with mesoporous silica (PP-g-CaAlg@SiO) for adsorbing Bisphenol A (BPA) and Pb was prepared by calcium chloride (CaCl) crosslinking and hydrochloric acid solution treatment. The PP-g-CaAlg@SiO was characterized by SEM, TEM, BET, XRD, FTIR and TG. PP-g-CaAlg@SiO exhibited excellent adsorption capacity for BPA and Pb, because the formation of reticulated nanorod structure increased its specific surface area. Subsequently, the adsorption behaviours of BPA and Pb, including adsorption isotherms and adsorption kinetics, were investigated. Afterward, isothermal titration calorimetry (ITC) and molecular dynamics (MD) simulation were performed to explore the adsorption mechanism. The results indicated that hydrogen bonding played the leading role in the adsorption of BPA, while the bonding of Pb to carboxyl group binding sites was the focus of Pb adsorption. In addition, the adsorption capacity of PP-g-CaAlg@SiO was stable over 10 cycles.
Topics: Silicon Dioxide; Polypropylenes; Lead; Adsorption; Alginates; Water Pollutants, Chemical; Kinetics; Hydrogen-Ion Concentration
PubMed: 36958444
DOI: 10.1016/j.ijbiomac.2023.124131 -
Colloids and Surfaces. B, Biointerfaces Oct 2022This study developed, a novel polypropylene (PP) mesh combined with poly (L-lactic acid) (PLA) electrospun nanofibers loaded sirolimus (SRL). The PP mesh was combined...
This study developed, a novel polypropylene (PP) mesh combined with poly (L-lactic acid) (PLA) electrospun nanofibers loaded sirolimus (SRL). The PP mesh was combined with PLA/SRL (1/0, 1/0.01, 1/0.02; mass ratios) composed electrospun membrane characterized by FTIR spectroscopy, XPS and SEM, and evaluated for cytocompatibility in vitro. In an in vivo study, a total of 84 Sprague-Dawley rats were employed to evaluate the efficacy of the novel composite PP mesh anti-adhesion, mechanical properties and inflammation. As a results, the PLA/SRL membrane could compound with PP mesh stably and load SRL. Although tensile testing showed that the mechanical properties of composite mesh decreased in vivo, the integration strength between the tissue and mesh was still able to counteract intra-abdominal pressure. Compared with the native PP mesh group, the novel PP mesh group showed a lower score for abdominal adhesion and inflammation. More importantly, the novel PP mesh completely integrated with the abdominal wall and had sufficient mechanical strength to repair abdominal wall defects.
Topics: Animals; Herniorrhaphy; Inflammation; Lactic Acid; Polyesters; Polypropylenes; Rats; Rats, Sprague-Dawley; Sirolimus; Surgical Mesh; Tissue Adhesions
PubMed: 35985128
DOI: 10.1016/j.colsurfb.2022.112772 -
Molecules (Basel, Switzerland) May 2023In this study, nanocomposites based on polypropylene are synthesized by the in situ polymerization of propene in the presence of mesoporous SBA-15 silica, which acts as...
Polypropylene Nanocomposites Attained by In Situ Polymerization Using SBA-15 Particles as Support for Metallocene Catalysts: Effect of Molecular Weight and Tacticity on Crystalline Details, Phase Transitions and Rheological Behavior.
In this study, nanocomposites based on polypropylene are synthesized by the in situ polymerization of propene in the presence of mesoporous SBA-15 silica, which acts as a carrier of the catalytic system (zirconocene as catalyst and methylaluminoxane as cocatalyst). The protocol for the immobilization and attainment of hybrid SBA-15 particles involves a pre-stage of contact between the catalyst with cocatalyst before their final functionalization. Two zirconocene catalysts are tested in order to attain materials with different microstructural characteristics, molar masses and regioregularities of chains. Some polypropylene chains are able to be accommodated within the silica mesostructure of these composites. Thus, an endothermic event of small intensity appears during heating calorimetric experiments at approximately 105 °C. The existence of these polypropylene crystals, confined within the nanometric channels of silica, is corroborated by SAXS measurements obtained via the change in the intensity and position of the first-order diffraction of SBA-15. The incorporation of silica also has a very significant effect on the rheological response of the resultant materials, leading to important variations in various magnitudes, such as the shear storage modulus, viscosity and δ angle, when a comparison is established with the corresponding neat iPP matrices. Rheological percolation is reached, thus demonstrating the role of SBA-15 particles as filler, in addition to the supporting role that they exert during the polymerizations.
Topics: Polymerization; Polypropylenes; Metallocenes; Molecular Weight; Scattering, Small Angle; X-Ray Diffraction; Nanocomposites; Silicon Dioxide
PubMed: 37298738
DOI: 10.3390/molecules28114261 -
Neurourology and Urodynamics Jan 2021To compare the effectiveness and safety of polypropylene (PP) and polyvinylidene fluoride (PVDF) transobturator tapes (TOT) for the treatment of female stress urinary... (Randomized Controlled Trial)
Randomized Controlled Trial
Polypropylene and polyvinylidene fluoride transobturator slings for the treatment of female stress urinary incontinence: 1-Year outcomes from a multicentre randomized trial.
AIMS
To compare the effectiveness and safety of polypropylene (PP) and polyvinylidene fluoride (PVDF) transobturator tapes (TOT) for the treatment of female stress urinary incontinence (SUI).
METHODS
This is a multicentre randomized trial. Women with SUI or stress-predominant mixed urinary incontinence and scheduled for a TOT procedure were randomized to PP or PVDF slings. The primary outcome was 1-year cure or improvement rate using composite criteria. Complications were also compared. Relationships with outcomes were analyzed using multivariable logistic regressions models.
RESULTS
From April 2016 to January 2018 285 participants were randomized. PP and PVDF slings showed similar high cure or improvement rate (91.0% vs. 95.6%, p = .138). Improvement in validated questionnaires was also similar. PVDF slings were associated with a lower rate of de novo urgency incontinence (adjusted odds ratio = 0.35; 95% confidence interval = 0.15-0.80). We found no statistical differences in complications rates, although a higher incidence of long-term pain events were observed in the PP group. The study is underpowered to find differences in specific complications owing to the low number of events.
CONCLUSION
PP and PVDF TOTs are equally effective, although PVDF is associated with fewer cases of de novo urgency incontinence. Further studies are needed to give robust conclusions on safety profiles.
Topics: Aged; Female; Humans; Male; Middle Aged; Polypropylenes; Polyvinyls; Surveys and Questionnaires; Treatment Outcome; Urinary Incontinence; Urinary Incontinence, Stress; Urologic Surgical Procedures
PubMed: 33259073
DOI: 10.1002/nau.24586 -
Langmuir : the ACS Journal of Surfaces... Nov 2023With the current worldwide increasing use of plastics year by year, nanoplastics (NPs) have become a global threat to environmental and public health concerns. Among...
With the current worldwide increasing use of plastics year by year, nanoplastics (NPs) have become a global threat to environmental and public health concerns. Among plastics, polypropylene (PP) is widely used in industrial and medical applications. Owing to the lack of validated detection methods and standard materials for PP NPs, understanding the impact of PP NPs on the environmental and biological systems is still limited. Here, isotactic polypropylene (iPP) was fabricated into oxidized polypropylene micro/nanoplastics (OPPs) via a thermal oxidation using hydrogen peroxide (HO) under various heating temperatures. The resulting OPPs were investigated in terms of the size distribution, surface chemistry, morphology, and thermal property as well as their concentration-dependent cytotoxicity to a human intestinal epithelial cell line (Caco-2), which could be a route to uptake NPs into the body through the food chain. The average diameters of the OPPs decrease with increasing reaction temperature. The OPPs obtained at 175 °C (OPP175) were spherical in shape and had a rough surface, with size distributions of approximately 0.14 ± 0.02 μm. A significant increase in the carbonyl content of the oxidized product was confirmed by Fourier transform infrared and X-ray photoelectron spectroscopy analyses. Caco-2 cells were exposed to OPP175 in a dose-dependent manner, and a significant loss of cell viability occurred at the concentration of 100 μg/mL. Thus, this study provides a fundamental approach for the fabrication of a model of NPs for the urgently demanded in vitro and in vivo studies to assess the potential impact of NPs on biological systems.
Topics: Humans; Polypropylenes; Microplastics; Caco-2 Cells; Hydrogen Peroxide; Plastics; Water Pollutants, Chemical
PubMed: 37882450
DOI: 10.1021/acs.langmuir.3c01858 -
Environmental Research Sep 2022One of the most common environmental pollutant in aquatic ecosystems are polypropylene microplastics and their impacts on aquatic organisms are still scarce. The study...
One of the most common environmental pollutant in aquatic ecosystems are polypropylene microplastics and their impacts on aquatic organisms are still scarce. The study aimed to prepare polypropylene microplastics using organic solvent (spherical and 11.86-44.62 μm) and then test their toxicity on the freshwater benthic mollusc grazer Pomaceae paludosa. The present study investigated chronic (28 days) exposure of polypropylene microplastics via dietary supplements (250 mg kg, 500 mg kg & 750 mg kg) in P. paludosa, and the toxic effect was evaluated in digestive gland tissue. The FTIR results revealed no change in polypropylene microplastics during ingestion or after egestion. On the other hand, Ingestion causes accumulation in their bodies and disrupts redox homeostasis. Meanwhile, alteration occurs in oxidative stress-related biomarkers such as increased reactive oxygen species level (ROS), impaired the biochemical parameters of antioxidant system catalase (CAT), glutathione peroxidase (GPx), reduced glutathione (GSH), and glutathione - S- transferase (GST), deterioration of oxidative stress effects in lipid peroxidation (LPO) and carbonyl protein (CP) and changed the digestive enzymes such as amylase, pepsin, esterase and alkaline phosphatase that are measured in hepatopancreas tissue. The histology results revealed that ingesting these microplastics caused severe damage to the digestive gland cells. According to the findings, ingestion of polypropylene microplastics in benthic freshwater mollusc causes more serious harm and impacts energy acquisition. This finding represents the ecological risk of polypropylene microplastic pollution in the freshwater ecosystem.
Topics: Animals; Ecosystem; Fresh Water; Glutathione Transferase; Microplastics; Mollusca; Oxidative Stress; Plastics; Polypropylenes; Water Pollutants, Chemical
PubMed: 35504343
DOI: 10.1016/j.envres.2022.113370 -
Medical Device Technology Jun 2004PP volumes for use in medical applications increase every year for some obvious reasons. The polymer can be processed by practically all techniques and sterilisation and... (Review)
Review
PP volumes for use in medical applications increase every year for some obvious reasons. The polymer can be processed by practically all techniques and sterilisation and transparency processes, and its properties are continuously improved. Furthermore, it can replace many other materials, and is attractive from a cost and versatility perspective.
Topics: Biocompatible Materials; Equipment and Supplies; Manufactured Materials; Polypropylenes; Product Packaging; Syringes; Textiles
PubMed: 15285487
DOI: No ID Found -
Journal - American Intra-Ocular Implant... 1984
Topics: Humans; Lenses, Intraocular; Plastics; Polypropylenes; Sutures
PubMed: 6735888
DOI: 10.1016/s0146-2776(84)80115-9 -
Advances in Colloid and Interface... Jul 2012The sliding of drops of aqueous solutions of organic liquids over a superhydrophobic polypropylene (SH-PP) surface has been studied experimentally. The multi-scale... (Review)
Review
The sliding of drops of aqueous solutions of organic liquids over a superhydrophobic polypropylene (SH-PP) surface has been studied experimentally. The multi-scale roughness of this surface is intrinsically inhomogeneous. Careful analysis of the wettability of each solution enables us to establish the statistics of the advancing and receding contact angles. We consider a threshold value of the receding static contact angle, above which drop sliding and rebound are facilitated as the criterion for superhydrophobicity. The percentage of receding contact angles greater than this threshold is then used as a practical index of superhydrophobicity (SHI). The variation of the SHI is compared with surface tension of the solution and various wetting parameters. A linear correlation is found between the SHI and the work of wetting defined by γ(LG)cosθ(0) where γ(LG) is the surface tension of the solution and θ(0) is the static contact angle of the solution over the corresponding smooth surface. Such a correlation can be used as a predictive tool of the superhydrophobicity of a given surface with various liquids.
Topics: Hydrophobic and Hydrophilic Interactions; Particle Size; Polypropylenes; Solutions; Surface Properties
PubMed: 22483352
DOI: 10.1016/j.cis.2012.03.003 -
Macromolecular Rapid Communications Sep 2022For decades, crude oil spills and oil wastewater have become the most problematic environmental pollution and damage to public health. Therefore, it is considerable to...
For decades, crude oil spills and oil wastewater have become the most problematic environmental pollution and damage to public health. Therefore, it is considerable to develop superhydrophobic polymer foam for separating oil from water with high selectivity and sorption capacity. Here, a new type of environmentally friendly pure polypropylene (PP) foam with superhydrophobicity is first time proposed with a particular coexistence of microspheres and microporous structure fabricated via an advanced solvent-evaporation method. The PP foam exhibits exceptional superhydrophobic with a water contact angle of 151° and the maximum saturated adsorption capacity of 26 g g . After more than 15 h of cyclic continuous oil-water pumping experiment, it still maintains a high oil absorption efficiency of 98%, providing the basis for practical commercial applications. More importantly, the variation of hydrophobic properties is described by Flory-Huggins polymer solution theory and Huggins interaction parameters, and the optimal solution ratio range is predicted which provides a relevant theoretical basis for actual industrial production.
Topics: Microspheres; Petroleum Pollution; Polypropylenes; Solvents; Water
PubMed: 35355354
DOI: 10.1002/marc.202200177