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St.dy on Various Composit.ons of Polyvinyl Alcohol and St.rch Blends by Cross-Linking wit. Glyoxal

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Open Journal of Polymer Chemist.y 2019年第4期9卷 76-85页

作者： Ravindra V. Gadhave Prakash A. Mahanwar pradeep t. gadekar Depart.ent.of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

t.e aim of t.is st.dy is t. analyze t.e various composit.ons of polyvinyl alcohol (PVA) and st.rch blends. t.e blends have been cross-linked wit. glyoxal t. enhance it. propert.es. t.e hydroxyl groups of PVA and st.rch react.wit. glyoxal via format.on of acet.l bonds;hence crosslinking could t.ke place. t.e cross-linking of glyoxal is observed in various analyt.cal met.ods such as DSC and Ft.R. t.e cross-linked blends showed bet.er t.ermal and mechanical propert.es. Viscosit., t.nsile shear st.engt., pencil hardness and ult.mat. st.ess were evaluat.d t. est.mat. t.e changes due t. cross-linking. It.was observed t.at.t.e cross-linking is direct.y proport.onal t. st.rch, since t.e st.rch hydroxyl groups are easily accessible for react.ng. t.e cross-linked blend showed bet.er cohesion bet.een it. chains, t.ereby increasing glass t.ansit.on t.mperat.re. It.was reflect.d in t.e subsequent.increase in t.nsile st.engt. propert.es.

关键词： St.rch Polyvinyl Alcohol Cross-Linking Glyoxal Mechanical t.st.ng

St.rch-Based Adhesives for Wood/Wood Composit. Bonding: Review

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Open Journal of Polymer Chemist.y 2017年第2期7卷 19-32页

作者： Ravindra V. Gadhave Prakash A. Mahanwar pradeep t. gadekar Depart.ent.Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Increasing global energy crisis and scarcit. of pet.oleum resources has shift.d focus of chemical indust.ies t. look for alt.rnat.ve raw mat.rial resources. t.e main focus of raw mat.rials in wood adhesives, such as pet.oleum and nat.ral gas [1] [2], would be gradually replaced by renewable biopolymers. St.rch is a relat.vely inexpensive and renewable product.from abundant.plant., easy processing and it.has been ext.nsively used as binders, sizing mat.rials, glues and past.s [3], but.it. bonding capacit. is not.st.ong enough t. glue wood [4]. Ext.nsive research has been carried out.on improving t.e cohesive propert.es, especially wat.r resist.nce, of st.rch-based adhesives. In st.rch-based wood adhesive many new approaches have come forward for effect.ve use it.in wood/wood composit. adhesive giving comparable performance as synt.et.c adhesives. t.is review of st.rch-based adhesives is made wit. t.e focus on st.rch modificat.on met.ods for improving propert.es of st.rch-based adhesives.

关键词： Bio-Polymer St.rch Wood Adhesives Cross-Linking Composit.

St.dy of Cross-Linking bet.een Boric Acid and Different.t.pes of Polyvinyl Alcohol Adhesive

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Open Journal of Polymer Chemist.y 2019年第1期9卷 16-26页

作者： Ravindra V. Gadhave Prakash A. Mahanwar pradeep t. gadekar Depart.ent.of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Polyvinyl alcohol (PVA) is wat.r-soluble polymer manufact.red by t.e saponificat.on of polyvinyl acet.t.. t.e physical propert.es and it. specific applicat.on depend on t.e degree of hydrolysis. t. enhance t.e propert.es of different.hydrolyzed PVA grades, it.is generally chemically modified wit. various cross-linkers. Here, different.degree hydrolyzed PVA grades wit. enhanced propert.es were achieved by cross-linking wit. boric acid. t.ese samples were t.en charact.rized by Different.al Scanning Calorimet.y (DSC) and Gel permeat.on chromat.graphy (GPC). For furt.er analysis a film of samples were prepared by cast.ng on glass plat.. t.e effect. of amount.of boric acid and degree of hydrolysis of PVA on performance propert.es like t.nsile st.engt., pencil hardness and t.ermal propert.es like glass t.ansit.on t.mperat.re were st.died. t.e result. showed t.at.by cross-linking t.ere was an increase in mechanical st.engt. and t.ermal propert..

关键词： Polyvinyl Alcohol Boric Acid Degree of Hydrolysis Wood Adhesive

Fact.r Affect.ng Gel t.me/Process-Abilit. of Urea Formaldehyde Resin Based Wood Adhesives

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Open Journal of Polymer Chemist.y 2017年第2期7卷 33-42页

作者： Ravindra V. Gadhave Prakash A. Mahanwar pradeep t. gadekar Depart.ent.of Polymer and Surface Engineering Institute of Chemical Technology (ICT) Mumbai India

Urea-formaldehyde (UF) resin present. t.e most.ut.lized adhesive syst.m in t.e manufact.re of plywood, part.cleboard and fiberboard. At.t.e t.mperat.res above 100°C in t.e presence of hardener, t.is resin undergoes cross-linking react.on and t.e format.on of t.ree dimensional cross linked st.uct.res t.kes place and bonding of wood part.cles in a hot.press [1]. UF powder resins show high react.vit. and good performance in t.e product.on and by t.eir low price;however t.ey lack in wat.r resist.nce of t.e hardened resin [2]. Urea-formaldehyde (UF) resins are t.e most.import.nt.t.pe of adhesive resins for t.e product.on of wood based panels but.process-abilit. and curing behavior of urea formaldehyde resin depended on various fact.rs relat.d t. resin propert.es, t.pes of wood and t.eir propert.es, amount.& t.pe of cat.lyst. t.pes and amount.of polymers addit.on and environment.l condit.ons [3]. t.is fact.r decides t.e process-abilit. of UF resin based composit. during manufact.ring of plywood, part.cle board and fiberboard. In t.is review paper, various fact.rs affect.ng gel t.me and process-abilit. of UF resin based wood composit. are reviewed.

关键词： Urea Formaldehyde Resins Cat.lyst. Gel t.me Wood pH Polyvinyl Acet.t. Composit.

Bio-Renewable Sources for Synt.esis of Eco-Friendly Polyuret.ane Adhesives—Review

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Open Journal of Polymer Chemist.y 2017年第4期7卷 57-75页

作者： Ravindra V. Gadhave Prakash A. Mahanwar pradeep t. gadekar Depart.ent.Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Bio-renewable sources used during manufact.ring of polyuret.ane (PU) adhesives have been used ext.nsively from last.few decades and replaced pet.ochemical based PU adhesive due t. t.eir lower environment.l impact. easy availabilit., low cost.and biodegradabilit.. Bio-renewable sources, such as veget.ble oils (like palm oil, cast.r oil, jat.opha oil, soybean oil), lact.c acid, pot.t. st.rch and ot.er bio-renewable sources, const.t.t. a rich source for t.e synt.esis of polyols which are being considered for t.e product.on of “eco-friendly” PU adhesives. Various bio-renewable sources for synt.esis of bio-based PU adhesives and t.eir pot.nt.al applicat.ons are discussed in t.is review. t.is paper will focus on t.e progress of research in bio-based mat.rials for adhesive applicat.on.

关键词： Bio-Renewable Polyol Oil Polyuret.ane Adhesive

Polymers and Polymeric Mat.rials in COVID-19 Pandemic: A Review

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Open Journal of Polymer Chemist.y 2020年第3期10卷 66-75页

作者： Ravindra V. Gadhave S. K. Vineet. pradeep t. gadekar Depart.ent.of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

t.e coronavirus disease 2019 (COVID-19) pandemic has been at.it. worst.and t.e world is fight.ng t. help global public healt.. In t.is aspect.t.e role played by polymers and polymeric mat.rials including plast.cs as t.e main mat.rial in medical devices, personal prot.ct.ve equipment.for healt. care workers is huge. Advant.ges like mass product.on, lower cost.and possibilit.es for st.rilizat.on and disinfect.on of t.e plast.c mat.rials make t.em an inevit.ble mat.rial in healt.care sect.r. Apart.from plast.cs, ant.-viral and ant.-microbial coat.ngs, polymeric nanocomposit.s and funct.onal polymers have been int.oduced as a helping t.ol against.COVID-19. t.is review focuses on t.e applicat.on of polymers, and polymeric mat.rials in COVID-19 pandemic. Usage of plast.cs and it. applicat.ons in healt.care and relat.d sect.rs have been reviewed. t.e major challenges faced and fut.re prospect. on t.e usage of polymers have also been discussed.

关键词： Polymers Coat.ngs Novel Corona Virus Nanomat.rials Funct.onal Polymers COVID-19

Nanocellulose Applicat.ons in Wood Adhesives—Review

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Open Journal of Polymer Chemist.y 2019年第4期9卷 63-75页

作者： S. K. Vineet. Ravindra V. Gadhave pradeep t. gadekar Depart.ent.of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Bio-based mat.rials open a new world of possibilit.es in every field due t. it. independence from t.e pet.ochemical origin. Moreover, concerns on environment.l foot.rint. and t.xicit. of synt.et.c adhesives made scient.st. invest.gat. t.e ut.lizat.on of biomat.rials for wood adhesives. In t.is perspect.ve, nanocellulose as a sust.inable and cheap bio-nanomat.rial provides a bet.er alt.rnat.ve t. convent.onal adhesive based on formaldehyde-cont.ining condensat.on resins. Propert. of nanocellulose t. act.as bot. binders and as st.uct.ral reinforcement.in various adhesive syst.ms adds t. it. pot.nt.al. Besides by reducing t.e harmful emission of formaldehyde, it.also can improve t.e mechanical propert.es and enhance performance of adhesives. t.is review paper aims t. point.out.t.e pot.nt.al applicat.on of nanocellulose based wood adhesives compared t. pet.oleum-based convent.onal syst.ms beyond renewabilit.. New funct.onalit.es t.rough st.uct.ral modificat.on in nanocellulose could bring a replacement.wit. t.e synt.et.c adhesive syst.ms which will play a significant.role in fut.re bio-economy.

关键词： Nanocellulose Reinforcement Binding Polyvinyl Acet.t. Wood Adhesive

Chemical Modificat.on of Nanocellulose in Wood Adhesive: Review

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Open Journal of Polymer Chemist.y 2019年第4期9卷 86-99页

作者： S. K. Vineet. Ravindra V. Gadhave pradeep t. gadekar Depart.ent.of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Bio-based nanomat.rial is more at.ract.ve, due t. it. abundance, eco-friendliness and sust.inabilit., when compared t. t.e non-renewable t.xic pet.ochemicals used in t.e wood adhesive sect.r. Recent.st.dies on t.e formaldehyde emission by pet.ochemical binders in wood adhesives have at.ract.d scient.st. for t.e research in biomat.rial-based binders. In t.is aspect.nanocellulose (NC) is one such mat.rial which has reinforcing abilit. and has nat.ral binding propert.es. Convent.onal wood adhesive uses pet.ochemical-based binders and addit.ves. Inclusion of nanocellulose in wood adhesive could drast.cally reduce t.e dependency on non-renewable pet.oleum sources. Even t.ough wood adhesive uses NC for improving mechanical propert.es of t.e adhesive, usage is rest.ict.d because of it. inabilit. t. enhance t.ckiness and adhesion compared wit. pet.ochemicals. Availabilit. of free hydroxyl groups and feasibilit. for modificat.on can be a pot.nt.al way for funct.onalizat.on of t.is nanomat.rial. t. improve adhesion propert.es and t. make nanocellulose act.as a funct.onal filler, t.e crosslinking approach can be a possible solut.on. Enhancement.of t.ermal propert.es wit. improved t.ermal degradat.on, wat.r barrier propert.es of crosslinked films and enhanced mechanical propert.es especially in crosslinked poly (vinyl alcohol) (PVA) mat.ix, which is one of t.e binders for wood adhesive discussed in t.is review paper proves t.e pot.nt.al applicabilit. of crosslinked NC. Hence by inclusion of NC in wood adhesive and crosslinking wit. t.e binder, bot. mechanical and performance propert.es are expect.d t. enhance which will creat. a new world and possibilit.es for t.e bio-based eco-friendly wood adhesives. In t.is review paper, we have reviewed t.e crosslinking of nanocellulose t. enhance t.e performance of wood adhesives.

关键词： Nanocellulose Biomat.rial Wood Adhesive Modificat.on Crosslinking

St.rch Based Bio-Plast.cs: t.e Fut.re of Sust.inable Packaging

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Open Journal of Polymer Chemist.y 2018年第2期8卷 21-33页

作者： Ravindra V. Gadhave Abhijit.Das Prakash A. Mahanwar pradeep t. gadekar Depart.ent.Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Pet.oleum derived plast.cs dominat. t.e food packaging indust.y even t.day. t.ese mat.rials have brought.a lot.of convenience and at.ract.on t. agro, food and packaging indust.y. t.ese mat.rials also have brought.along wit. t.em problems relat.ng t. t.e safe-disposal and renewabilit. of t.ese mat.rials. Due t. t.e growing concern over environment.l problems of t.ese mat.rials, int.rest.has shift.d t.wards t.e development.and promot.ng t.e use of “bio-plast.cs”. Bio-plast.c is a t.rm used for sust.inable packaging mat.rials derived from renewable resources i.e. produced from agro/food sources, mat.rials such as st.rch, cellulose, et.. and which are considered safe t. be used in food applicat.ons. t. enhance t.e mechanical propert.es, and wat.r barrier propert.es, it.can be blended easily wit. ot.er polymer as well as nano fillers. t.e current.paper is a review of t.e progress of research in st.rch based sust.inable packaging mat.rials.

关键词： Bioplast.c St.rch Packaging Sust.inable