東華大學圖書館 |

Surfactant-Free Emulsion Polymerization by "Grafting From" Polyvinylamine Stabilizer.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Surfactant-Free Emulsion Polymerization by "Grafting From" Polyvinylamine Stabilizer./
作者:	Gomes, Catarina Pereira.
面頁冊數:	1 online resource (86 pages)
附註:	Source: Masters Abstracts International, Volume: 83-09.
Contained By:	Masters Abstracts International83-09.
標題:	Surfactants. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29015344click for full text (PQDT)
ISBN:	9798209849896

Surfactant-Free Emulsion Polymerization by "Grafting From" Polyvinylamine Stabilizer.
Gomes, Catarina Pereira.

Surfactant-Free Emulsion Polymerization by "Grafting From" Polyvinylamine Stabilizer. - 1 online resource (86 pages)

Source: Masters Abstracts International, Volume: 83-09.

Thesis (Master's)--Instituto Politecnico de Braganca (Portugal), 2014.

Includes bibliographical references

Emulsion polymerization technique is one of the most common techniques employed in industry to synthesize a wide range of polymers due to its versatility, the possibility to control the properties of the final product and because it is an environmentally friendly technique. Nevertheless, large amounts of surfactant are usually required to stabilize the system which can have deleterious effects on water resistance and on the mechanical properties of the polymer. Among the different techniques employed to circumvent this problem, recently, graft copolymerization of a monomer from water-soluble polymers containing amino groups has been employed to synthesize polymer particles with amphiphilic core-shell nanostructures. Applications of these particles include controlled release drugs, water-borne coatings and diagnostic testing.In this project, water-soluble poly (N-vinylformamide) (PNVF) of different molecular weights was synthesized and characterized. Subsequently, the basic hydrolysis of these polymers was accomplished to obtain poly (vinyl amine) (PVAm) in an easy and controlled way. The synthesized poly (vinyl amines) were then employed as stabilizers in the surfactant-free emulsion polymerization of methyl methacrylate (MMA). The MMA monomer polymerizes via two different ways, grafting from polyvinylamine and homopolymerization, leading to a core-shell type particles with polyvinylamine-based shells. The effect of different variables such as initiator type and concentration, the pH of the reaction and the molecular weight of PVAm's on the conversion, grafting efficiency and morphology of the polymer particles were investigated. Throughout all the work, an extensive characterization of the polymers obtained in each step was performed in order to clarify possible mechanisms involved in this polymerization process. For the characterization of the polymeric particles obtained during this work were used some characterization techniques such as AF4, NMR, DLS, TEM, SEC/GPC and FT-IR.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798209849896Subjects--Topical Terms:

3560257
Surfactants.
Index Terms--Genre/Form:

542853
Electronic books.

Surfactant-Free Emulsion Polymerization by "Grafting From" Polyvinylamine Stabilizer.
LDR:05335nmm a2200397K 4500 001 2360642
005 20231015184442.5
006 m o d
007 cr mn ---uuuuu
008 241011s2014 xx obm 000 0 por d
020 $a 9798209849896
035 $a (MiAaPQ)AAI29015344
035 $a (MiAaPQ)Portugal1019811514
035 $a AAI29015344
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Gomes, Catarina Pereira. $3 3701265
245 1 0 $a Surfactant-Free Emulsion Polymerization by "Grafting From" Polyvinylamine Stabilizer.
264 0 $c 2014
300 $a 1 online resource (86 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 83-09.
500 $a Advisor: Simoes Dias, Rolando Carlos Pereira; Leiza, Jose Ramon.
502 $a Thesis (Master's)--Instituto Politecnico de Braganca (Portugal), 2014.
504 $a Includes bibliographical references
520 $a Emulsion polymerization technique is one of the most common techniques employed in industry to synthesize a wide range of polymers due to its versatility, the possibility to control the properties of the final product and because it is an environmentally friendly technique. Nevertheless, large amounts of surfactant are usually required to stabilize the system which can have deleterious effects on water resistance and on the mechanical properties of the polymer. Among the different techniques employed to circumvent this problem, recently, graft copolymerization of a monomer from water-soluble polymers containing amino groups has been employed to synthesize polymer particles with amphiphilic core-shell nanostructures. Applications of these particles include controlled release drugs, water-borne coatings and diagnostic testing.In this project, water-soluble poly (N-vinylformamide) (PNVF) of different molecular weights was synthesized and characterized. Subsequently, the basic hydrolysis of these polymers was accomplished to obtain poly (vinyl amine) (PVAm) in an easy and controlled way. The synthesized poly (vinyl amines) were then employed as stabilizers in the surfactant-free emulsion polymerization of methyl methacrylate (MMA). The MMA monomer polymerizes via two different ways, grafting from polyvinylamine and homopolymerization, leading to a core-shell type particles with polyvinylamine-based shells. The effect of different variables such as initiator type and concentration, the pH of the reaction and the molecular weight of PVAm's on the conversion, grafting efficiency and morphology of the polymer particles were investigated. Throughout all the work, an extensive characterization of the polymers obtained in each step was performed in order to clarify possible mechanisms involved in this polymerization process. For the characterization of the polymeric particles obtained during this work were used some characterization techniques such as AF4, NMR, DLS, TEM, SEC/GPC and FT-IR.
520 $a A Tecnica de polimerizacao em emulsao e uma das tecnicas mais comuns utilizadas na industria para sintetizar uma vasta gama de polimeros, devido a sua versatilidade, a possibilidade de controlar as propriedades do produto final e tambem porque e uma tecnica "Amiga do Ambiente". No entanto, grandes quantidades de surfatante sao geralmente necessarias para estabilizar o sistema, o que pode ter efeitos prejudiciais sobre a resistencia a agua e sobre as propriedades mecanicas do polimero. Entre as diferentes tecnicas utilizadas para contornar este problema, recentemente, a "Graft copolymerization" de um monomero com polimeros soluveis em agua contendo grupos amina foi utilizada para sintetizar particulas de polimeros com nanoestruturas anfifilicas do tipo nucleo-casca. Aplicacoes destas particulas incluem medicamentos de liberacao controlada, revestimentos a base de agua e testes de diagnostico.Neste projeto, foi sintetizado o polimero soluvel em agua poli (N-vinilformamida) (PNVF) com diferentes pesos moleculares tendo tambem sido realizada a sua caracterizacao. Subsequentemente foi realizada a hidrolise basica desses polimeros, obtendo poli (vinilamina) (PVAm). A poli (vinilamina) sintetizada foi utilizada como estabilizador na polimerizacao em emulsao livre de surfatante do metilo metacrilato (MMA). O monomero MMA polimeriza atraves de dois processos diferentes a partir de enxertia de poli (vinilamina) e homopolimerizacao que conduz a um tipo de particulas com nucleo e camadas a base de poli (vinilamina).Foi estudado o efeito de diferentes variaveis, tais como a concentracao do iniciador, o pH da reacao e o peso molecular de PVAm, tendo sido avaliado o seu efeito na conversao de monomero, eficiencia de enxerto e na morfologia das particulas de polimero. Para a caracterizacao das particulas polimericas obtidas ao longo deste trabalho foram utilizadas as seguintes tecnicas: AF4, NMR, DLS, TEM, SEC/GPC and FT-IR.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Surfactants. $3 3560257
650 4 $a Oil recovery. $3 3701266
650 4 $a Free radicals. $3 3682274
650 4 $a Nuclear magnetic resonance--NMR. $3 3560258
650 4 $a Hydrogen. $3 580023
650 4 $a Chemistry. $3 516420
650 4 $a Scientific imaging. $3 3560377
650 4 $a Chromatography. $3 1073639
650 4 $a Potassium. $3 3562093
650 4 $a Aqueous solutions. $3 3681511
650 4 $a Dyes. $3 3559972
650 4 $a Propagation. $3 3680519
650 4 $a Nuclear reactors. $3 673875
650 4 $a Viscosity. $3 1050706
650 4 $a Emulsion polymerization. $3 651857
650 4 $a Fourier transforms. $3 3545926
650 4 $a Cellulose. $3 588995
650 4 $a Carbon. $3 604057
650 4 $a Solvents. $3 620946
650 4 $a Kinetics. $3 717752
650 4 $a Textiles. $3 3559975
650 4 $a Mathematics. $3 515831
650 4 $a Medical imaging. $3 3172799
650 4 $a Nuclear engineering. $3 595435
650 4 $a Physics. $3 516296
650 4 $a Textile research. $3 2153103
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0485
690 $a 0405
690 $a 0574
690 $a 0552
690 $a 0605
690 $a 0994
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Instituto Politecnico de Braganca (Portugal). $3 3695884
773 0 $t Masters Abstracts International $g 83-09.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29015344 $z click for full text (PQDT)