Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium
ABA type tri-block amphiphilic polyelectrolyte consisting of poly(methyl methacrylate-block-methacrylic acid-block-methyl methacrylate) (P(MMA-b-MAA-b-MMA)) was synthesized by atom transfer radical polymerization technique (ATRP) and the self-assembly behavior of the polymers in aqueous solution was...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | en_US |
| Published: |
2003
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| Online Access: | http://hdl.handle.net/1721.1/3925 |
| _version_ | 1811097139265142784 |
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| author | Yao, Jia Palaniswamy, R. Tam, Michael K. C. Gan, L.H. |
| author_facet | Yao, Jia Palaniswamy, R. Tam, Michael K. C. Gan, L.H. |
| author_sort | Yao, Jia |
| collection | MIT |
| description | ABA type tri-block amphiphilic polyelectrolyte consisting of poly(methyl methacrylate-block-methacrylic acid-block-methyl methacrylate) (P(MMA-b-MAA-b-MMA)) was synthesized by atom transfer radical polymerization technique (ATRP) and the self-assembly behavior of the polymers in aqueous solution was studied over the course of neutralization. Combination of potentiometric and conductometric titrations along with dynamic light scattering (DLS) techniques were used to investigate the size and shape of aggregates at various degrees of neutralization. The effect of hydrophobic-hydrophilic (MMA-MAA) ratio and polymer chain length on the aggregation behavior during neutralization was studied. P(MMA-b-MAA-b-MMA) with longer MMA segment self-assembles via the close association mechanism through stronger self-entanglement of MMA chains, whereas P(MMA-b-MAA-b-MMA) with shorter MMA chain self-assembles via the open association mechanism, as confirmed by transmission electron microscopy (TEM). Conductometric titration was used to determine the counterion condensation during the course of neutralization. When the charge density of micelle approaches a critical value as neutralization progresses, counterion condensation of Na+ ions on the polymer chains occurs. The effect of counterion condensation on the aggregation behavior during neutralization was elucidated. |
| first_indexed | 2024-09-23T16:54:57Z |
| format | Article |
| id | mit-1721.1/3925 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:54:57Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | mit-1721.1/39252019-04-12T08:15:25Z Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium Yao, Jia Palaniswamy, R. Tam, Michael K. C. Gan, L.H. laser light scattering MMA-b-MAA-b-MMA potentiometric titration self-assemble ABA type tri-block amphiphilic polyelectrolyte consisting of poly(methyl methacrylate-block-methacrylic acid-block-methyl methacrylate) (P(MMA-b-MAA-b-MMA)) was synthesized by atom transfer radical polymerization technique (ATRP) and the self-assembly behavior of the polymers in aqueous solution was studied over the course of neutralization. Combination of potentiometric and conductometric titrations along with dynamic light scattering (DLS) techniques were used to investigate the size and shape of aggregates at various degrees of neutralization. The effect of hydrophobic-hydrophilic (MMA-MAA) ratio and polymer chain length on the aggregation behavior during neutralization was studied. P(MMA-b-MAA-b-MMA) with longer MMA segment self-assembles via the close association mechanism through stronger self-entanglement of MMA chains, whereas P(MMA-b-MAA-b-MMA) with shorter MMA chain self-assembles via the open association mechanism, as confirmed by transmission electron microscopy (TEM). Conductometric titration was used to determine the counterion condensation during the course of neutralization. When the charge density of micelle approaches a critical value as neutralization progresses, counterion condensation of Na+ ions on the polymer chains occurs. The effect of counterion condensation on the aggregation behavior during neutralization was elucidated. Singapore-MIT Alliance (SMA) 2003-12-15T22:46:26Z 2003-12-15T22:46:26Z 2004-01 Article http://hdl.handle.net/1721.1/3925 en_US Molecular Engineering of Biological and Chemical Systems (MEBCS); 1185930 bytes application/pdf application/pdf |
| spellingShingle | laser light scattering MMA-b-MAA-b-MMA potentiometric titration self-assemble Yao, Jia Palaniswamy, R. Tam, Michael K. C. Gan, L.H. Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium |
| title | Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium |
| title_full | Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium |
| title_fullStr | Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium |
| title_full_unstemmed | Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium |
| title_short | Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium |
| title_sort | association behavior of poly methyl methacrylate b methacrylic acid b methyl methacrylate in aqueous medium |
| topic | laser light scattering MMA-b-MAA-b-MMA potentiometric titration self-assemble |
| url | http://hdl.handle.net/1721.1/3925 |
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