Nitroxide mediated polymerization of n-butyl acrylate using accelerating agents
The effect of the Dicumyl Peroxide (DCP), Acetol and Acetic Anhydride on the conversion evolution, and molecular weight distribution in bulk nitroxide mediated polymerizations of n-butyl acrylate (BA) was studied. Temperature profile was 1 h at 90°C, and variable reaction times (between 2 and 32 ho...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Universidad del Zulia
2010-05-01
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| Series: | Revista Técnica de la Facultad de Ingeniería |
| Online Access: | https://www.produccioncientificaluz.org/index.php/tecnica/article/view/6099 |
| _version_ | 1811178646579183616 |
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| author | Myriam Gregorio De Las Heras David León Orietta León Diana Soto Haydee Oliva |
| author_facet | Myriam Gregorio De Las Heras David León Orietta León Diana Soto Haydee Oliva |
| author_sort | Myriam Gregorio De Las Heras |
| collection | DOAJ |
| description | The effect of the Dicumyl Peroxide (DCP), Acetol and Acetic Anhydride on the conversion evolution, and molecular weight distribution in bulk nitroxide mediated polymerizations of n-butyl acrylate (BA) was studied. Temperature profile was 1 h at 90°C, and variable reaction times (between 2 and 32 hours) at 135°C. Benzoyl peroxide (BPO) and 4-hidroxy-2,2,6,6-tetramethylpiperidinyl-1-oxyl (4-OH-TEMPO) were used as initiator and stable radical, respectively. Thermal, conventional, and nitroxide mediated polymerizations of the acrylic monomer were carried out for comparison purposes. Conversion was determined gravimetrically and some samples were selected for characterization by size exclusion chromatography (SEC). With DCP conversions were low and the polymerization was uncontrolled. Polymerization was inhibited for molar relation [DCP]/[4-OH-TEMPO] be low of 0,5; independently of the [4-OHTEMPO]/[BPO]. With acetol, reaction rate in creased respect to the polymerization with out this agent. Conversions reached 66%, while the products showed relatively narrow molecular weight distributions (PD 1,35-2,01). The polymerization rate in creased significantly at [Anh Ac]/[4-OH-TEMPO] ³ 4. In these cases, conversions were higher than 70% at first 2 h of reaction time. How ever, there was no control over these polymerizations. From the comparison of the effect for the studied agents, is possible to conclude that acetol produce better results on distribution of molar mass control, at acceptable polymer yields.
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| first_indexed | 2024-04-11T06:23:10Z |
| format | Article |
| id | doaj.art-98ce3a2dd9814391a6eb772dc5a29f32 |
| institution | Directory Open Access Journal |
| issn | 0254-0770 2477-9377 |
| language | English |
| last_indexed | 2024-04-11T06:23:10Z |
| publishDate | 2010-05-01 |
| publisher | Universidad del Zulia |
| record_format | Article |
| series | Revista Técnica de la Facultad de Ingeniería |
| spelling | doaj.art-98ce3a2dd9814391a6eb772dc5a29f322022-12-22T04:40:31ZengUniversidad del ZuliaRevista Técnica de la Facultad de Ingeniería0254-07702477-93772010-05-01301Nitroxide mediated polymerization of n-butyl acrylate using accelerating agentsMyriam Gregorio De Las Heras0David León1Orietta León2Diana Soto3Haydee Oliva4Universidad del Zulia-VenezuelaUniversidad del Zulia-VenezuelaUniversidad del Zulia-VenezuelaUniversidad del Zulia-VenezuelaUniversidad del Zulia-Venezuela The effect of the Dicumyl Peroxide (DCP), Acetol and Acetic Anhydride on the conversion evolution, and molecular weight distribution in bulk nitroxide mediated polymerizations of n-butyl acrylate (BA) was studied. Temperature profile was 1 h at 90°C, and variable reaction times (between 2 and 32 hours) at 135°C. Benzoyl peroxide (BPO) and 4-hidroxy-2,2,6,6-tetramethylpiperidinyl-1-oxyl (4-OH-TEMPO) were used as initiator and stable radical, respectively. Thermal, conventional, and nitroxide mediated polymerizations of the acrylic monomer were carried out for comparison purposes. Conversion was determined gravimetrically and some samples were selected for characterization by size exclusion chromatography (SEC). With DCP conversions were low and the polymerization was uncontrolled. Polymerization was inhibited for molar relation [DCP]/[4-OH-TEMPO] be low of 0,5; independently of the [4-OHTEMPO]/[BPO]. With acetol, reaction rate in creased respect to the polymerization with out this agent. Conversions reached 66%, while the products showed relatively narrow molecular weight distributions (PD 1,35-2,01). The polymerization rate in creased significantly at [Anh Ac]/[4-OH-TEMPO] ³ 4. In these cases, conversions were higher than 70% at first 2 h of reaction time. How ever, there was no control over these polymerizations. From the comparison of the effect for the studied agents, is possible to conclude that acetol produce better results on distribution of molar mass control, at acceptable polymer yields. https://www.produccioncientificaluz.org/index.php/tecnica/article/view/6099 |
| spellingShingle | Myriam Gregorio De Las Heras David León Orietta León Diana Soto Haydee Oliva Nitroxide mediated polymerization of n-butyl acrylate using accelerating agents Revista Técnica de la Facultad de Ingeniería |
| title | Nitroxide mediated polymerization of n-butyl acrylate using accelerating agents |
| title_full | Nitroxide mediated polymerization of n-butyl acrylate using accelerating agents |
| title_fullStr | Nitroxide mediated polymerization of n-butyl acrylate using accelerating agents |
| title_full_unstemmed | Nitroxide mediated polymerization of n-butyl acrylate using accelerating agents |
| title_short | Nitroxide mediated polymerization of n-butyl acrylate using accelerating agents |
| title_sort | nitroxide mediated polymerization of n butyl acrylate using accelerating agents |
| url | https://www.produccioncientificaluz.org/index.php/tecnica/article/view/6099 |
| work_keys_str_mv | AT myriamgregoriodelasheras nitroxidemediatedpolymerizationofnbutylacrylateusingacceleratingagents AT davidleon nitroxidemediatedpolymerizationofnbutylacrylateusingacceleratingagents AT oriettaleon nitroxidemediatedpolymerizationofnbutylacrylateusingacceleratingagents AT dianasoto nitroxidemediatedpolymerizationofnbutylacrylateusingacceleratingagents AT haydeeoliva nitroxidemediatedpolymerizationofnbutylacrylateusingacceleratingagents |