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Poly(vinyl alcohol) stabilization of...

Kim, Noma.

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Poly(vinyl alcohol) stabilization of acrylic emulsion polymers using the miniemulsion approach.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Poly(vinyl alcohol) stabilization of acrylic emulsion polymers using the miniemulsion approach./
作者:	Kim, Noma.
面頁冊數:	193 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1865.
Contained By:	Dissertation Abstracts International64-04B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086952

Poly(vinyl alcohol) stabilization of acrylic emulsion polymers using the miniemulsion approach.
Kim, Noma.

Poly(vinyl alcohol) stabilization of acrylic emulsion polymers using the miniemulsion approach. - 193 p.

Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1865.

Thesis (Ph.D.)--Lehigh University, 2003.

Miniemulsion approach was employed to obtain stable acrylic latexes of <italic> n</italic>-butyl acrylate and methyl methacrylate (50/50 wt%) stabilized with poly(vinyl alcohol) (PVA) and to enhance the grafting reaction between PVA and acrylic monomers at the water/droplet interface. The stability of miniemulsions were studied in terms of the type and concentration of' the stabilizer, and the PVA partitioning were determined as a function of the PVA concentration. Using the comparison of PVA partitioning at droplet surface and grafted PVA as a function of concentration, it was suggested that the water/monomer interface is the main grafting site in the miniemulsion polymerization.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Poly(vinyl alcohol) stabilization of acrylic emulsion polymers using the miniemulsion approach.
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100 1 $a Kim, Noma. $3 1946622
245 1 0 $a Poly(vinyl alcohol) stabilization of acrylic emulsion polymers using the miniemulsion approach.
300 $a 193 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1865.
500 $a Adviser: Mohamed S. El-Aasser.
502 $a Thesis (Ph.D.)--Lehigh University, 2003.
520 $a Miniemulsion approach was employed to obtain stable acrylic latexes of <italic> n</italic>-butyl acrylate and methyl methacrylate (50/50 wt%) stabilized with poly(vinyl alcohol) (PVA) and to enhance the grafting reaction between PVA and acrylic monomers at the water/droplet interface. The stability of miniemulsions were studied in terms of the type and concentration of' the stabilizer, and the PVA partitioning were determined as a function of the PVA concentration. Using the comparison of PVA partitioning at droplet surface and grafted PVA as a function of concentration, it was suggested that the water/monomer interface is the main grafting site in the miniemulsion polymerization.
520 $a Seeded emulsion and miniemulsion copolymerizations initiated with water-soluble (hydrogen peroxide, HPO), partially water-soluble (t-butyl peroxide, TBHP), and oil-soluble (t-butyl peroxyoctoate, TBPO) initiators were carried out to further investigate the oil/water interface as the grafting site for PVA. The interaction between the capillary wall in the CHDF (capillary hydrodynamic fractionation) chromatographic particle sizer and the water-soluble polymers adsorbed on the particle surface was studied using different types of water-soluble polymers and eluants. Different grafting architectures depending on the initiation site were suggested based on the CHDF results.
520 $a The amounts of grafted PVA produced in miniemulsion polymers initiated with TBHP and TBPO were substantially less than those in the corresponding seeded emulsion polymerizations. The effect on the internal viscosity at the interface was proposed to explain the difference in grafting in terms of polymerization methods. Aqueous phase and interface grafting were studied using the measurement of the degree of hydrolysis (DH) of the serum PVA and adsorbed PVA after miniemulsion polymerizations. Based on the results, it was found that aqueous phase and interface grafting occurred in the HPO system; however, interface grafting dominated the TBHP system.
520 $a Colloidal instability in conventional emulsion polymerizations was investigated and compared with the corresponding miniemulsion polymerization. It was found that the grafted PVA in conventional emulsion polymerizations was more hydrophobic presumably due to a greater amount of grafted chains than that in similar miniemulsion polymerizations and this could be correlated with the colloidal instability during conventional emulsion polymerizations.
590 $a School code: 0105.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, Polymer. $3 1018428
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690 $a 0495
710 2 0 $a Lehigh University. $3 515436
773 0 $t Dissertation Abstracts International $g 64-04B.
790 1 0 $a El-Aasser, Mohamed S., $e advisor
790 $a 0105
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086952