Current Applied Polymer Science最新文献

{"title":"Materials from Biomass: A Constant Challenge","authors":"M. Poletto","doi":"10.2174/245227160403211231164546","DOIUrl":"https://doi.org/10.2174/245227160403211231164546","url":null,"abstract":"","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"732 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74771899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Auxetic Polymer Foams: Production, Modeling and Applications","authors":"Ouassim Hamdi, D. Rodrigue","doi":"10.2174/2452271604666211130123921","DOIUrl":"https://doi.org/10.2174/2452271604666211130123921","url":null,"abstract":"\u0000\u0000Auxetic materials have high potential due to their exceptional properties resulting from their negative Poisson ratio. Recently, several auxetic polymer-based materials have been developed. \u0000In fact, several applications are looking for a lightweight (less material consumed in production and transport) while having high mechanical performances (impact absorption, rigidity, strength, resistance, etc.). So, a balance between density and toughness/strength is of high importance, especially for military, sporting, and transport applications. So auxetic materials (especially foams) can provide high impact protection while limiting the material’s weight.\u0000\u0000This article presents a review of recent advances with a focus on auxetic polymers, with particular emphasis on the auxetic polymer foams in terms of their fabrication methods and processing conditions (depending on the nature of the cellular structure), the effect of the fabrication parameters on their final properties, as well as their models and potential applications.\u0000\u0000","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91269283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Er3+Incorporated Transparent Ternary Nanocomposite as Active Core Material in Polymer Optical Preform with Improved Photo-emission Performance","authors":"Ipsita Chinya, R. Sen, A. Dhar","doi":"10.2174/2452271604666211130123241","DOIUrl":"https://doi.org/10.2174/2452271604666211130123241","url":null,"abstract":"\u0000\u0000 A polymer as a host in the optical waveguide has many advantages and, when doped with rare-earth (RE) elements, offers an efficient connection, compared to its glass-based counterparts as an amplifier. However, a polymer matrix causes the concentration quenching effect of REs in the polymer matrix, making the fabrication of RE-doped polymer waveguides more complicated as compared to the fabrication of glass-based complements. Moreover, controlling scattering loss at the particle-polymer interface for maintaining the optical clarity of the composite is also a great challenge.\u0000\u0000\u0000\u0000\u0000The main aim of the present study was to optimize the synthesis of Er2O3grafted Polymethylmethacrylate (PMMA)-Polystyrene (PS) composite based transparent ternary nanocomposite and its characterization to implement them as a potential material for active core in Polymer Optical Preform (POP). \u0000\u0000\u0000\u0000\u0000 Nano Erbium Oxide (Er2O3) was successfully synthesized by the wet-chemical method and encapsulated by a polymerizable surfactant, i.e., 3-Methacyloxypropyltrimethoxy silane (MPS). The encapsulated nanoparticles were further subjected to grafting with PMMA using in-situ polymerization of methyl methacrylate (MMA) followed by blending with PS via solvent mixing technique. \u0000\u0000\u0000\u0000\u0000 The optical transparency of the ternary composite was achieved by fine-tuning the diameter (15-20 nm) of the PMMA coated Er2O3. The crystallinity present in Er2O3 was significantly reduced after PMMA coating. The comparatively higher refractive index obtained at 589 nm wavelength for the synthesized material indicated its usability as active core material in the presence of a commercial acrylate cladding tube. A photoluminescence (Pl) study indicated that the technique might be used for a higher level of Er3+doping in polymer matrix without sacrificing its transparency. \u0000\u0000\u0000\u0000\u0000 The obtained results indicated that the sample synthesized with the adopted technique gives better Pl intensity compared to the other methods of Er3+ incorporation in polymer optical preform (POP).\u0000\u0000","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72626595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polymer nanofibers for biomedical applications: advances by electrospinning","authors":"A. L. Toledo, Talita N. da Silva, Arianne C. dos S. Vaucher, Arthur H. V. Miranda, Gabriela C. C. Silva de Miranda, Maria Eduarda R. Vaz, Luísa Vieira da Silva, T. N. Barradas, Paulo H. S. Picciani","doi":"10.2174/2452271604666211122122557","DOIUrl":"https://doi.org/10.2174/2452271604666211122122557","url":null,"abstract":"\u0000\u0000The demand for novel biomaterials has been exponentially rising in the last years as well as the searching for new technologies able to produce more efficient products in both drug delivery systems and regenerative medicine. Objective: The technique that can pretty well encompass the needs for novel and high-end materials with a relatively low-cost and easy operation is the electrospinning of polymer solutions. \u0000\u0000\u0000\u0000\u0000Electrospinning usually produces ultrathin fibers that can be applied in a myriad of biomedical devices including sustained delivery systems for drugs, proteins, biomolecules, hormones, etc that can be applied in a broad spectrum of applications, from transdermal patches to cancer-related drugs. \u0000\u0000\u0000\u0000\u0000Electrospun fibers can be produced to mimic certain tissues of the human body, being an option to create new scaffolds for implants with several advantages. \u0000\u0000\u0000\u0000\u0000In this review, we aimed to encompass the use of electrospun fibers in the field of biomedical devices, more specifically in the use of electrospun nanofibers applications toward the production of drug delivery systems and scaffolds for tissue regeneration.\u0000\u0000","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85267075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Functionality of Organophosphorus Flame Retardants on Flammability and Thermal Stability of DGEBA-Based Epoxy Resin Nanocomposites","authors":"Priyanka Bazzad, J. B. Dahiyab","doi":"10.2174/2452271604666211104091336","DOIUrl":"https://doi.org/10.2174/2452271604666211104091336","url":null,"abstract":"\u0000\u0000Epoxy resins have been extensively used in fire hazard environments, such as printed circuit boards, electrical isolation materials, adhesives, construction, and transportation due to their economically viable, simple processing. Therefore, the development of thermally stable and flame-retardant epoxy resin systems is essential.\u0000\u0000\u0000\u0000\u0000The aim of the present study was to study the effect of the functionality of organophosphorus flame retardants on DGEBA-based epoxy resin nanocomposites on thermal stability and flame retardancy. \u0000\u0000\u0000\u0000\u0000DGEBA (diglycidyl ether of bisphenol-A)-based epoxy resin nanocomposites having 2.0 wt% phosphorus were prepared with organophosphorus flame retardants with different functionalities by using an in-situ polymerization method. The flame retardant compounds uni-functional 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and bi-functional 2-(6-oxid-6H-dibenz [c, e] [1, 2] oxaphosphorin 6-yl) 1, 4-benzenediol (DOPO-HQ) were prepared. The thermal behavior of composites was studied by TG and DTA techniques. The flammability behavior was investigated by UL-94 and limiting oxygen index (LOI) tests.\u0000\u0000\u0000\u0000\u0000The XRD and TEM results showed the mixed dispersion of nanoclay platelets in an epoxy matrix. The thermal stability of the epoxy composite (EPDOPO-HQ) containing bi-functional DOPO-HQ is increased by 16 oC in comparison to the epoxy composite (EPDOPO) containing uni-functional DOPO. According to the TG analysis, the addition of nanoclay was observed to be more effective and synergistic with bi-functional DOPO-HQ as the EPDOPO-HQ/NC sample gains more resistance to degradation after around 450 oC and also gave rise to a high char yield. Epoxy resin samples containing reactive flame retardants gave UL-94 V-0 rating, but further addition of 2.0 wt% nanoclay lowered the rating from V-0 to V-1. \u0000\u0000\u0000\u0000\u0000TG analysis of the epoxy composite samples showed that the addition of nanoclay were observed to be synergistic with bi-functional flame retardant (DOPO-HQ) as the EPDOPO-HQ/NC sample gained more resistance to degradation after around 450 oC due to the formation of mixed intercalated and exfoliated structure. The EPDOPO-HQ sample gave a high char yield with increased onset degradation temperature, high thermal stability as well as high flame retardancy.\u0000\u0000","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87480902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-healing organic coatings based on microcapsules – A patent-based review","authors":"Diego Moreira Schlemper, S. Pezzin","doi":"10.2174/2452271604666210913103301","DOIUrl":"https://doi.org/10.2174/2452271604666210913103301","url":null,"abstract":"\u0000\u0000Self-healing coatings are intended to increase long-term durability and reliability and can be enabled by the presence of microcapsules containing a self-healing agent capable of interacting with the matrix and regenerating the system. This review article provides an overview of the state-of-the-art, focusing on the patents published in the field of microcapsule-based self-healing organic coatings, since the early 2000’s. A discussion about coatings for corrosion protection and the different self-healing approaches and mechanisms are also addressed, as well as future challenges and expectations for this kind of coatings.\u0000","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78649560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of artificial ageing of PVC stabilized with epoxidized sunflower oil as biobased derivative","authors":"N. Gallouze, Naima Belhaneche-Bensemrab, S. Commereuc, V. Verney","doi":"10.2174/2452271604666210820093434","DOIUrl":"https://doi.org/10.2174/2452271604666210820093434","url":null,"abstract":"\u0000\u0000The objective of this work is the study of artificial ageing of semi-rigid and plasticized polyvinyl chloride (PVC) stabilized with epoxidized sunflower oil (ESO) as biobased derivative in combination with zinc and calcium stearates. \u0000\u0000\u0000\u0000For comparison, a formulation of PVC plasticized and stabilized with epoxidized soya bean oil (ESBO) was considered. Artificial ageing was carried out during the 304 hours. Samples were taken off after: 48, 146, 234 and 304 hours and then characterized. The evolution of density, glass transition temperature and morphology, was followed as a function of the time. The structural modifications of polymer were analyzed by Fourier transform infrared spectroscopy in attenuated total reflectance and transmission modes. \u0000\u0000\u0000\u0000The results showed a little decrease of density, a considerable increase of the glass transition temperatures values and a change of morphology. All changes in the properties of PVC relate to formation of new chemical structures.\u0000\u0000\u0000\u0000Globally, it was found that ESO exhibited similar performances to those of ESBO \u0000","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81029792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Meet the Editorial Board Member","authors":"M. Rocco","doi":"10.2174/245227160402211118121133","DOIUrl":"https://doi.org/10.2174/245227160402211118121133","url":null,"abstract":"R. Gangaraju received a Ph.D. in Molecular Biology with a wealth of experience in preclinical pharmacology, animal model development and drug discovery with specific training and expertise in key research areas including signal transduction pathways in mesenchymal stem cells and endothelial cells. His laboratory focuses on the neurovascular unit (NVU) of the retina in health and disease. They primarily utilize preclinical in vitro and in vivo models to investigate the potential of their findings for clinical translation, with the long-term goal of advancing the clinical management of diabetic retinopathy, age-related macular degeneration and visual deficits of traumatic brain injury. He serves as the Chairman of the Scientific Advisory Board. His successful collaborations led to several peer-reviewed publications, conference abstracts and patent applications for each project. He also served as the reviewer of several biomedical journals and grant agencies including UK Diabetes and DoD.","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88325986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scaffolds Designing from Protein-loadable Coaxial Electrospun Fibermats of poly(acrylamide)-co-poly(diacetone acrylamide) and Gelatin","authors":"Yuji Tanikawa, A. Obata, K. Nagata, T. Kasuga, T. Mizuno","doi":"10.2174/2452271604666210716143235","DOIUrl":"https://doi.org/10.2174/2452271604666210716143235","url":null,"abstract":"\u0000\u0000A core-shell fiber mat is one of the attractive platforms for this purpose. However, very few details the importance of choosing the suitable material for the shell units that can endow efficient release properties. The tailored design of cytokine-releasing scaffolds aiming at in situ regenerative therapy is still one of the crucial issues to be studied. \u0000\u0000\u0000\u0000In this study, we characterized the effectiveness of core-shell fiber mats that possess cross-linked gelatin (CLG) as the shell layer of constituent nanofibers, as a protein-releasing cell-incubation scaffold.\u0000\u0000\u0000\u0000We utilized a crosslinked copolymer of poly (acrylamide)-co-poly (diacetone acrylamide) (poly (AM/DAAM)) and adipic acid dihydrazide (ADH), poly (AM/DAAM)/ADH for the core nanofibers in the core-shell fiber mats. By coaxial electrospinning and the subsequent crosslinking of the gelatin layer, we successfully constructed core-shell fiber mats consisting of double-layered nanofibers of poly (AM/DAAM)/ADH and CLG. Using fluorescein isothiocyanate-labeled lysozyme (FITC-Lys) as a dummy guest protein, we characterized the release behavior of the core-shell fiber mats containing a CLG layer. Upon loading essential fibroblast growth factor (bFGF) as cargo in our fiber mats, we also characterized the impacts of the released bFGF on the proliferation of the incubated cells.\u0000\u0000\u0000\u0000Although the single-layered poly (AM/DAAM)/ADH nanofiber fiber mats did not adhere to the mammalian cells, the core-shell fiber mat with the CLG shell layer exhibited good adherence and subsequent proliferation. A sustained release of the preloaded FITC-Lys over 24 days without any burst release was observed, and the cumulative amount of released protein reached over 65% after 24 days. Upon loading bFGF in our fiber mats, we succeeded in promoting cell proliferation and highlighting its potential for therapeutic applications.\u0000\u0000\u0000\u0000We successfully confirmed that core-shell fiber mats with a CLG shell layer around the constituent nanofibers were practical as protein-releasing cell-incubation scaffolds.\u0000","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"279 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81242037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Meet Our Editor-in-Chief","authors":"F. G. Souza","doi":"10.2174/245227160401210204124812","DOIUrl":"https://doi.org/10.2174/245227160401210204124812","url":null,"abstract":"<jats:sec>\u0000<jats:title />\u0000<jats:p />\u0000</jats:sec>","PeriodicalId":10768,"journal":{"name":"Current Applied Polymer Science","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85787925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}