检索结果-南通市图书馆

A Review： Investigation of bioplastics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2015年第2期9卷 188-192页

作者： Ezgi Bezirhan Arikan Havva Duygu Ozsoy Department of Environmental Engineering Mersin University Mersin 33343 Turkey

Because of increasing environmental concerns/legislative pressure for plastics waste and rapid increases in the cost of petroleum, the development of ＂environmental friendly＂ materials has attracted extensive interest. Recently, bioplastics are one of the most innovative environmental friendly materials developed. Therefore, this paper will look at aspects of the bioplastics from the perspective of sustainability, advantages/disadvantages and standards. The global bioplastics market is thought to be growing at a rate of 20%-25% per year. They have some advantages such as lower carbon footprint, independence, energy efficiency, and eco-safety. However, they have some disadvantages such as high cost, recycling, reducing raw materials, misused of terms and lack of legislation. For the sustainability, recycling systems and production technology may be developed for bioplastics and by-product should be used for their production. Also, there is much standardization about them. It is important to have comparable international standard methods. Therefore, there is an urgent need to standardize all details. A new guide and standard for just bioplastics should be developed for production, usage and bioplastic waste management for every country in the world.

关键词： Advantages of bioplastics bioplastics disadvantages of bioplastics standards sustainability.

Effects of Light Radiation Absoption on the Resistance of Sweet Potato Starch-Based bioplastics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science and Chemical Engineering 2022年第2期10卷 44-52页

作者： Aristide Herlyn Wilfrid Nakavoua Emmanuelle Surya Ouenadio Pascale Ursula Nkoua-Ouassamo Vincent Verney Laboratory of Natural Substances Chemistry (IRSEN) Brazzaville Congo Laboratory for The Valorisation of Agri-Resources Ecole Normale Superieure Politechnique (ENSP) Marien Ngouabi University Brazzaville Congo UMR 6296 Team Design of Polymers and Macromolecules Scientist Set Cézeaux Institute of Chemistry of Clermont-Ferrand (ICCF) Clermont-Ferrand French

The strength of starch-based bioplastics is a challenge, we tried to overcome this limitation by using electromagnetic radiation in the visible range. Synthetically obtained retrograde bioplastics were subjected to radiation from an Edison-type incandescent lamp. A cross-linked network is obtained within the bioplastic matrix considerably attenuating the usual hygroscopicity of starch and increasing the ability to resist rupture. After this positive behavior, the bioplastics were colored in order to optimize the action of light radiation. The results show a stronger and more compact bioplastic. The green-colored bioplastics show the best performance in the optimization of the resistance.

关键词： bioplastics Starch Sweet Potato Radiation and Light Stress

A Methodological Outlook on bioplastics from Renewable Resources

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Polymer Chemistry 2020年第2期10卷 21-47页

作者： Jomin Thomas Department of Polymer Engineering University of Akron Akron Ohio USA

Bio plastics products have a rapid growing demand and market across the globe. Polymers synthesized from renewable resources have gained immense popularity, in numerous applications ranging from films, bottles, food packaging, drug delivery, bags to agriculture mulch films. Various naturally occurring resources available for starch and PLA extraction and the associated polymer processing techniques are discussed. Alongside some basic concepts on blown film extrusion, the modifications needed for such specialized polymer processing techniques are also explored, giving a comprehensive outlook on bioplastics. Special process analysis, for its application as films are discussed. In the current scenario, as the world aspires for environmental and polymer sustainability, Bioplastic products are of high value. The review article would be beneficial to those embarked on designing bio-plastics products from renewable resources.

关键词： Thermoplastic Starch Polylactic Acid PLA Extrusion Blown Film Extrusion Gelatinization Plasticization bioplastics Polymer Sustainability

Sustainable Materials Based on Cellulose from Food Sector Agro-Wastes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2018年第7期6卷 688-696页

作者： T.Côto I.Moura A.de Sá C.Vilarinho A.V.Machado Institute of Polymers and Composites(IPC)and Institute of Nanostructures Nanomodelling and Nanofabrication(i3N)University of MinhoCampus de Azurém4800-058 GuimarãesPortugal Mechanical Engineering Department University of MinhoCampus de Azurém4800-058 GuimarãesPortugal

Biopolymers exhibit unique properties and can be produced from plants’ and crops’ wastes. Cellulose has beenused for the production of sustainable materials, nevertheless due to the difficulty inherent to its extraction,several methods have been studied in order to optimize the process. Therefore, this paper reports the extractionof natural polymers from food sector agro-food wastes, including cellulose, following a green chemistry *** cellulose extracted from pumpkin peel was acetylated and dispersed in a polylactic acid (PLA) matrix. Thedeveloped materials were characterized in terms of their structure, morphology and thermal stability. Theresults demonstrated the efficient chemical modification of cellulose and confirmed its good dispersion withinthe PLA matrix.

关键词： Food sector agro-wastes cellulose ionic liquid acetylation polylactic acid bioplastics

Blend of Polyhydroxyalkanoates Synthesized By Lipase Positive Bacteria From Plant Oils

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第5期7卷 463-476页

作者： Nasir Javaid Rida Batool Nazia Jamil Department of Microbiology and Molecular Genetics University of the PunjabQuaid-e-Azam CampusLahore-54590Pakistan

A total of 5 biochemically characterized lipase positive bacterial strains were screened for Polyhydroxyalkanoates(PHA)production by Nile blue staining and confirmation was done by Sudan Black *** production ability for all strains was optimized followed by time profiling calculation and comparison via using glucose and two plant oils i.e.,canola and mustard *** analysis showed that glucose can serve as a carbon source for maximum biomass(2.5 g/L CDW for strain 5)and PHA production(70.3%for strain 2).PHA produced by strain 2 was further analyzed for its chemical composition and type via Fourier Transform Infrared(FT-IR)*** revealed homopolymer(PHB)and copolymer(PHB-co-PHV)production of PHA(peaks at 1743 cm-1 and 2861 cm-1,respectively)with both canola and mustard oil unlike glucose which produced only homopolymer one i.e.,PHB(peaks at 1110 cm-1,1411 cm-1 and 1650 cm-1).Crystallinity of FT-IR analyzed PHA was calculated using mathematical formulas which showed decrease from glucose to canola to mustard *** study revealed that plant oils can serve as better carbon source to produce better quality(ductile and copolymer)***,16S rRNA gene sequencing analysis showed that strain 1,strain 2,strain 3,strain 4 and strain 5 are Stenotrophomonas sp.N3,Exiguobacterium sp.N4,Exiguobacterium ***3,Cellulosimicrobium sp.A8 and Klebsiella ***2,respectively.

关键词： bioplastics polyhydroxyalkanoates lipase positive bacteria plant oils,FT-IR

Computer Aided Design and Performance Analysis of Inverse Fluidized Bed Biofilm Reactors with Special Reference to Bioplastic Synthesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Chemical Engineering and Science 2016年第2期6卷 130-139页

作者： C. M. Narayanan Shrijita Das Department of Chemical Engineering National Institute of Technology Durgapur India

Poly Laevo Lactic Acid (PLLA), in spite of being an excellent bioplastic, has exorbitantly high market price due to the high cost of raw material (lactose, glucose, sucrose). Hence, its manufacture is being attempted starting from waste effluents such as cheese whey and molasses. Earlier studies on the same in fluidized bed and semifluidized bed biofilm reactors yielded encouraging results. The present study therefore involves design and analysis of inverse fluidized bed biofilm reactors for lactic acid synthesis. The performance features of the bioreactor have been studied both mathematically as well as experimentally. The inverse fluidized bed biofilm reactor has been found to provide more than 75% conversion of sucrose/lactose even at high capacities (high feed flow rates) exceeding 56,000 L/hr, within a reasonably low reactor volume. The fractional substrate conversion increases, though sluggishly, with increase in feed flow rate due to bed expansion and also with increase in cell mass concentration in biofilm due to enhancement in intrinsic rate of bioconversion. The inverse fluidized bed biofilm reactor of proposed design could be safely recommended for the commercial synthesis of polymer grade lactic acid from waste effluents such as cheese whey and molasses. The low operating cost of the bioreactor (due to downflow mode of operation) enhances the economy of the process. This would also help in significantly lowering the market price of the green plastic (PLLA) and shall promote its large scale manufacture and utilisation.

关键词： Inverse Fluidized Bed Biofilm Reactors Computer Aided Design bioplastics Lactic Acid Synthesis Software Development

Reexamining intra and extracellular metabolites produced by Pseudomonas aeruginosa

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Coastal Life Medicine 2016年第2期4卷 132-139页

作者： Maria Shuja Nazia Jamil Department of Microbiology and Molecular Genetics University of the Punjab Lahore-54590Pakistan

Objective:To isolate,screen and analyze bacteria from different areas of Pakistan for the production of antimicrobial compounds,zinc solubilization and bioplastic ***:Isolation and purification was proceeding with streak plate *** assay was completed with well diffusion and thin-layer *** vivo analysis of bioplastic was analyzed with Nile blue fluorescence under UV and Sudan ***:A total of 18 bacterial strains purified from soil samples while 148 strains form stock cultures were *** of 166 only 94 showed antimicrobial activity against each of Grampositive and Gram-negative;cocci and *** case of heavy metal(ZnO and Zn_(3)(PO_(4))_(2)·4H_(2)O)solubilization,54 strains solubilized ZnO and 23 strains solubilized Zn_(3)(PO_(4))_(2)·4H_(2)O,while 127 strains grown on polyhydroxyalkanoate detection meedia supplemented with Nile blue medium showed bioplastic production by producing fluorescence under UV *** bacterial strains(coded as 100,101,104 and 111)were selected for further *** time assay showed that strains 101,104,and 111 showed inhibitory activity after 4 h of incubation while strain 100 showed after 8 *** four strains were tolerable to the maximum concentration of *** products of both 16S rRNA and PhaC gene fragments of strain 111 were sequenced and submitted to GenBank as accession numbers EU781525 and ***:Bacterial strain Pseudomonas aeruginosa-111 has potential to utilize as biofertilize and bioplastic producer.

关键词： Antimicrobial activity Solubilization Zinc Oxide Zinc Phosphate bioplastics