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Effects of plasticizers,Antioxidants and Burning Rate Modifiers on Aging Performance of the HTPB/HMDI Composite Solid Propellant

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含能材料 2019年第1期27卷 21-27,90页

作者： Ahmed M Enew Ehab Abadir Sahar Elmarsafy Karim K Elsharkawy Chemical Department Faculty of EngineeringCairo University School of Chemistry and Environment Beijing University of Aeronautics and Astronautics

The effects of plasticizers,antioxidants and burning rate modifiers on the aging performance of the composite solid propellant based on hydroxyl-terminated polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)were explored by apply-ing an accelerated aging program for 90 day at 70 ℃. The HTPB propellant matrix with the diisooctyl sebacate(DOS)as plasti-cizers and diisooctyl azelate(DOZ), antioxidants as N,N ′-Diphenyl-p-phenylenediamine(AO) and 2,2′-methylenebis(4-methyl-6-tert-butylphenol)(cyanox 2246)and burning rate modifiers as barium ferrite(BF),copper chromites(CC)and fer-ric oxide(FO)were varied. Results show that sample(S1)which based on DOS decreases the stress value and increases the strain value which considered to be an excellent start for aging program. Sample(S3)containing AO presents the higher resis-tance to oxidation showing the better performance that reflects on increasing the shelf life of the composite solid propellant mo-tor. Sample(S5)which based on BF enhances the ballistic performance among over the other tested two samples. The accelerat-ed aging program allowed us to estimate the motor in-service lifetime.

关键词： polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)composite solid propellant plasticizers antioxidants burning rate modifiers aging program

Novel Designed PEG-Dicationic Imidazolium-Based Ionic Liquids as Effective plasticizers for Sustainable Polylactide

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Chinese Journal of Chemistry 2021年第8期39卷 2234-2240页

作者： Huijie Zuo Xiangjian Chen Yingli Ding Liang Cui Baomin Fan Li Pan Kunyu Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300350China Polyolefin Research Department Petrochina Petrochemical Research InstituteBeijing 102206China Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics Beijing Technology and Business UniversityBeijing 100048China

A series of novel polyethylene glycol-dicationic imidazolium-based ionic liquids(mPEG-ILs)were synthesized by facile quaternization reaction from various elaborately designed di-imidazoles and PEG,which were then stud... 详细信息

关键词： Ionic liquids plasticizers Polylactide Chain structure Hydrogen bonds

Reduction of the Additives Migration from Poly Vinyl Chloride Films by the Use of Permanent plasticizers

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Journal of Geoscience and Environment Protection 2014年第4期2卷 49-56页

作者： M. O. Boussoum N. Belhaneche-Bensemra 1Faculté des Sciences de la Nature et de la Vie Université de Tiaret Algérie 2Ecole Nationale Polytechnique BP 182 El-Harrach Alger Algérie Ecole Nationale Polytechnique BP 182 El-Harrach Alger Algérie

This aim of this work is to study the partial replacement of the plasticizer ordinarily used di-octyl phtalate (DOP) by the permanent plasticizers ethylene-vinyl-acetate (EVA) and acrylonytrile-bu- tadiene-styrene (ABS) in order to reduce migration of additives initially contents in polyvinyl chloride (PVC) stabilized with expoxidized sunflower oil (ESO). Migration tests with agitation to 40°C in sunflower oil and ethanol at 15% were made. Migration phenomenon was studied on the basis of the PVC samples mass variations, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) analysis. The results showed the effectiveness of the approach consisting in the partial substitution of DOP by plasticizers of polymeric nature. The following order concerning the migration of additives was found: DOP (40) > DOP:EVA > (30/10) DOP:ABS (30/10). Furthermore, all the measured values of overall migrations were lower than the maximum allowable overall migration: 10 mg-dm-2.

关键词： PVC Migration DOP Permanent plasticizers Mass Variation FTIR Spectroscopy SEM

Rheological Studies on Glycerol Plasticized Gelatin and Its Blends with Epoxidized Soybean Oil

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Journal of Renewable Materials 2019年第1期7卷 21-30页

作者： E.M.Ciannamea L.A.Castillo R.A.Ruseckaite S.E.Barbosa Instituto de Investigaciones en Ciencia y Tecnología de Materiales(INTEMA) Universidad Nacional de Mar del Plata-CONICETAv.J.B.Justo 4302Mar del PlataB7608FDQArgentina Planta Piloto de Ingeniería Química(PLAPIQUI) UNS-CONICETCno.La Carrindanga Km.7Bahía Blanca8000Argentina Departamento de Ingeniería Química Universidad Nacional del SurAv.Alem 1253Bahía Blanca8000Argentina

Blends of gelatin(Ge)plasticized with varying amounts of glycerol(Gly),buffer solution pH 10 and epoxidized soybean oil(ESO)to enhance hydrophobicity were prepared by mixing and injection-molding.Blends were characterized by rheological tests and microscopy to select optimal conditions for scaling up their processing.The effect of each component on rheological response was analyzed using parallel plate geometry.Coating of gelatin specimens with PDMS during rheological tests led to reliable and reproducible results since water evaporation was prevented.A gradual increment in ESO concentration led to blends with increased degree of phase separation,as evidenced by optical and confocal microscopy.Limited compatibility between ESO and Ge increased viscosity at high ESO levels,but up to 10%Gly could be replaced with ESO without a significant variation of rheological behavior.

关键词： Rheology renewable plasticizers gelatin blends microstructure

Hot melt extrusion:An industrially feasible approach for casting orodispersible film

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Asian Journal of Pharmaceutical Sciences 2015年第4期10卷 292-305页

作者： Rushiraj Jani Dasharath Patel School of Pharmacy RK UniversityRajkotGujaratIndia Department of Pharmaceutics and Pharmaceutical Technology Shri Sarvajanik Pharmacy CollegeMehsanaGujaratIndia

Over the recent few decades,many groups of formulation scientists are concentrating on rapid release dosage forms in oral cavity.Among all fast release dosage forms,orodispersible films are successful to attract pharmaceutical industry due to ease of formulation and extension patent life.Films are popular in patients too because of quick onset and user friendliness of dosage form.From the beginning,solvent casting has been selected as method of choice for manufacturing of orodispersible films.Solvent casting has been proved as a benchmark technology because of ease in product development,process optimization,process validation and technology transfer to production scale despite of some drawbacks like more number of unit operations involved and consumption of large quantity of solvents with controlled limits of organic volatile impurities in final formulation.The application of hot-melt extrusion(HME)in the pharmaceutical industry is consecutively increasing due to its proven innumerable advantages like solvent free continuous process with fewer unit operations and better content uniformity.Very few development activities has been initiated in the field of hot melt extruded orodispersible films so far.This extensive review covers detailed discussion of heavy duty industrial extruders,selection of downstream equipments,selection of excipients,common problems found in formulations and their remedies.Successive part of review addresses identification of critical quality attributes,quality target profile of product,criticality in selection of process parameters and material for substantial simulation in laboratory scale and production for successful technology transfer.

关键词： Extruders Film forming polymers plasticizers Die swell phenomenon Quality by design Scale up

Occurrence of aryl and alkyl-aryl phosphates in Canadian house dust

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Emerging Contaminants 2021年第1期7卷 149-159页

作者： Cariton Kubwabo Xinghua Fan Guru Prasad Katuri Arezoo Habibagahi Pat E.Rasmussen Environmental Health Science and Research Bureau Health CanadaOttawaONCanada

This study investigated the occurrence of 19 aryl phosphates and mixed alkyl-aryl phosphates in dust samples(n=144)collected under the Canadian House Dust Study(CHDS).The predominant target analytes,detected in 100%of the samples,were isodecyl diphenyl phosphate(IDDPP),cresyl diphenyl phosphate(CDPP),and isopropylated triaryl phosphates(ITPs),with median concentrations of 1225(248-17850)ng/g,91(14-57700)ng/g,and 805(203-152000)ng/g,respectively.ITPs included isopropylphenyl diphenyl phosphate(IPPDPP),bis(isopropylphenyl)phenyl phosphate(BIPPPP),and tris(isopropylphenyl)phosphate(TIPPP).Strong correlations were found among IPPDPP,BIPPPP,and TIPPP,suggesting that there might be various consumer and building products containing mixtures of these substances.Bisphenol A bis(diphenyl phosphate)(BPA-DP)and resorcinol bis(diphenyl phosphate)(RBDP)were detected in 69%and 78%of samples,with relatively low median concentrations of 30(max:818)ng/g and 14(max:307)ng/g,respectively.Since the usage of OPEs as flame retardants has increased over the past decade,the current levels of OPEs in Canadian house dust could be higher than those reported in this study,where the samples were collected in 2007-2010.Further monitoring of OPEs in various environmental and biological matrices is recommended.

关键词： Aryl phosphates Alkyl-aryl phosphates LC-MS/MS House dust Flame retardants plasticizers Dust collection

Irradiation Effect on Photodegradation of Pure and Plasticized Poly (4-Methylstyrene) in Solid Films

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Materials Sciences and Applications 2014年第5期5卷 300-315页

作者： Saria A. Al Safi Thanaa M. Al Mouamin Wadhah N. Al Sieadi Khalid E. Al Ani Department of Chemistry Faculty of Science Baghdad University Baghdad Iraq

The photodegradation of irradiated thin films of poly (para-methylstyrene) with 265 nm radiations in the presence of airand as a function of irradiation time has been studied using UV-VIS, fluorescence and FT-IR Spectroscopic techniques. The influence of phthalate and terephthalate plasticizers on stability of poly (para-methylstyrene) towards irradiations was also investigated. Blending with phthalate plasticizers was found to cause a higher efficiency of photodegradation than that obtained in doping with terephthalate plasticizers. The intensity of absorption was also found to increase with time of irradiation and in change in the shape of the spectra at longer wavelength, thus indicating a possibility of photodegradation of polymer chains. The analysis of the FT-IR spectra of the irradiated and non-irradiated samples, shows a predominant absorption associated with carbonyl compounds with 1740 cm-1. In addition, the observed increase in the intensities of the carbonyl and hydroxyl regions of the FT-IR spectra, have provided an evidence for the photodegradation as well as photo-oxidation of polymeric chains. The presence of the plasticizer in the polymer backbone was found to accelerate the photodegradation of polymeric chains.

关键词： Excimer Fluorescence Photodegradation Kinetics Phthalate plasticizers Poly (Para-Methylstyrene)

Plasticization Effect on the Photodegradation of Poly (4-Chlorostyrene) and Poly (4-Bromostyrene) Films

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Materials Sciences and Applications 2010年第6期1卷 358-368页

作者： Khalid E. Al Ani Afrah Essa Ramadhan 不详

The photodegradation of thin films of poly (4-chlorostyrene) and poly (4-bromostyrene) with 265 nm radiation in the presence of oxygen and as a function of irradiation time has been studied mainly using fluorescence, FT-IR, and UV-VIS spectroscopic techniques. The influence of phthalate and terephthalate plasticizers on photo-oxidative degradation was also investigated. Phthalate and terephthalate-plasticizers were found to increase the photodegradation processes in polymeric chains. On the other hand, the intensity of absorption was also found to increase with irradiation time and in the intensity of a new absorption band at longer wavelength. The appearance of new fluorescence bands in the irradiated polymer films can well indicate a possibility of photodegradation of polymer films. In addition, the observed increase in the intensities of the carbonyl and hydroxyl regions of the FT-IR spectra, providing evidence for the photodegradation as well as the photo-oxidation of polymeric chains. The increase in the analyzed ranges was attributed to the formation of alcohols, aliphatic ketones and to the increase in the number of (C=C) that resulted from hydrogen abstraction during chains - scission.

关键词： Excimer Fluorescence Poly (4-Bromostyrene) poly (4-Chlorostyrene) Photodegradation Kinetics Phtha-late plasticizers

Research Advances on Immunoassays for Phthalic Acid Esters

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Agricultural Biotechnology 2020年第3期9卷 67-72页

作者： Yin CUI Ming LI Daolin DU Shool of the Environment and Safety Engineering Jiangsu University/Institute of Environmental EcologyAcademy of Environmental Health and Ecological SafetyJiangsu UniversityZhenjiang 212013China

Phthalates( PAEs) compounds are a class of widely used environmental hormone plasticizers. Their harm to the environment and human health has caused a lot of attention. The detection of such substances,especially the simple and rapid detection,is of great significance for the protection of environmental food safety and consumer health. At present,a series of rapid immunoassay techniques have been applied to PAE detection with advantages of simple and fast operation,low cost,high sensitivity,high specificity and high throughput,achieving the goal of screening a large number of samples and making up for the shortcomings of chromatographic detection which uses expensive equipment with cumbersome operation,requires professional and technical personnel,and cannot achieve the target of screening a large number of samples. This paper introduced the research progress of PAE antibodies and their rapid immunoassay technology,and performed evaluation,in order to provide guidance and help for the development and application of PAE rapid detection technology.

关键词： Phthalates plasticizers Immunoassay Research progress