Dielectric relaxation behavior of poly(acrylonitrile- co-methacrylonitrile) microcapsules dispersed in a silicone matrix
The dielectric relaxation behavior of poly(acrylonitrile- co-methacrylonitrile) dispersed in a cured polydimethyl siloxane (PDMS) matrix as microcapsules was investigated over multiple thermal cycles and at varying concentrations. The copolymer microcapsules contained an isopentane core. In the PDMS...
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| Veröffentlicht in: | Polymer (Guilford) 2006-05, Vol.47 (11), p.4218-4229 |
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| container_title | Polymer (Guilford) |
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| creator | Park, Taigyoo O'Brien, Emmett Lizotte, Jeremy R. Glass, Thomas E. Ward, Thomas C. Long, Timothy E. Leo, Donald J. |
| description | The dielectric relaxation behavior of poly(acrylonitrile-
co-methacrylonitrile) dispersed in a cured polydimethyl siloxane (PDMS) matrix as microcapsules was investigated over multiple thermal cycles and at varying concentrations. The copolymer microcapsules contained an isopentane core. In the PDMS matrix this copolymer displayed a pronounced relaxation signal at temperatures above the glass transition of the copolymers due to Maxwell–Wagner–Sillars (MWS) relaxation. The mechanism of MWS relaxation interpreted by the Havriliak–Negami and Kohlrausch–Williams–Watts relaxation functions was found to be very similar to previous studies of neat polyacrylonitrile and its copolymer. The activation energy of the relaxation decreased over successive thermal cycling coincident with a decreasing strength of the relaxation. These observations were attributed to the decreasing concentration of nitrile groups due to intramolecular cyclizations. |
| doi_str_mv | 10.1016/j.polymer.2006.03.056 |
| format | Article |
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co-methacrylonitrile) dispersed in a cured polydimethyl siloxane (PDMS) matrix as microcapsules was investigated over multiple thermal cycles and at varying concentrations. The copolymer microcapsules contained an isopentane core. In the PDMS matrix this copolymer displayed a pronounced relaxation signal at temperatures above the glass transition of the copolymers due to Maxwell–Wagner–Sillars (MWS) relaxation. The mechanism of MWS relaxation interpreted by the Havriliak–Negami and Kohlrausch–Williams–Watts relaxation functions was found to be very similar to previous studies of neat polyacrylonitrile and its copolymer. The activation energy of the relaxation decreased over successive thermal cycling coincident with a decreasing strength of the relaxation. These observations were attributed to the decreasing concentration of nitrile groups due to intramolecular cyclizations.</description><subject>Applied sciences</subject><subject>Chemistry And Materials (General)</subject><subject>Copolymer</subject><subject>Dielectric relaxation behavior</subject><subject>Electrical, magnetic and optical properties</subject><subject>Exact sciences and technology</subject><subject>Organic polymers</subject><subject>Physicochemistry of polymers</subject><subject>Polyacrylonitrile</subject><subject>Properties and characterization</subject><issn>0032-3861</issn><issn>1873-2291</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>CYI</sourceid><recordid>eNqFkU1v1DAQhiMEEkvLPwDJFxA9JB07H45PqCoFKlXiUs7WxBmrXjlxsLPV7r_Hy66EOHGy5HnmHc_jonjPoeLAu-tttQR_mChWAqCroK6g7V4UG97LuhRC8ZfFBqAWZd13_HXxJqUtAIhWNJti_8WRJ7NGZ1gkj3tcXZjZQE_47EJkwbJj-Cc08eDD7DLoqWQmlBOtT__cXrHJmRgMLmnnKbHRpYViopG5mSFLzjsTZmITZnx_Wbyy6BO9PZ8Xxc-vd4-338uHH9_ub28eSlMrvpaqlbzBhnec2oFb1QEZAdai5LU0qulbZYS1MAx5oxFkj0AjKiUH0Qs7dPVF8fGUu8Twa0dp1ZNLhrzHmcIuaaFqKYVqM9iewLxDSpGsXqKbMB40B330rLf67FkfPWuodfac-z6cB2Ay6G3E2bj0t1n2nDdSZO7diZsxoZ7XmP7EQM5oQOXy51OZsoxnl4ck42g2NLqY_0ePwf3nIb8Bdb6h5Q</recordid><startdate>20060517</startdate><enddate>20060517</enddate><creator>Park, Taigyoo</creator><creator>O'Brien, Emmett</creator><creator>Lizotte, Jeremy R.</creator><creator>Glass, Thomas E.</creator><creator>Ward, Thomas C.</creator><creator>Long, Timothy E.</creator><creator>Leo, Donald J.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>CYE</scope><scope>CYI</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope></search><sort><creationdate>20060517</creationdate><title>Dielectric relaxation behavior of poly(acrylonitrile- co-methacrylonitrile) microcapsules dispersed in a silicone matrix</title><author>Park, Taigyoo ; O'Brien, Emmett ; Lizotte, Jeremy R. ; Glass, Thomas E. ; Ward, Thomas C. ; Long, Timothy E. ; Leo, Donald J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c391t-95714a4161e5b1f960ec20ffa7137c94859c2ff0bb002d078a0eda997b282fb63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Applied sciences</topic><topic>Chemistry And Materials (General)</topic><topic>Copolymer</topic><topic>Dielectric relaxation behavior</topic><topic>Electrical, magnetic and optical properties</topic><topic>Exact sciences and technology</topic><topic>Organic polymers</topic><topic>Physicochemistry of polymers</topic><topic>Polyacrylonitrile</topic><topic>Properties and characterization</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Park, Taigyoo</creatorcontrib><creatorcontrib>O'Brien, Emmett</creatorcontrib><creatorcontrib>Lizotte, Jeremy R.</creatorcontrib><creatorcontrib>Glass, Thomas E.</creatorcontrib><creatorcontrib>Ward, Thomas C.</creatorcontrib><creatorcontrib>Long, Timothy E.</creatorcontrib><creatorcontrib>Leo, Donald J.</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><jtitle>Polymer (Guilford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Park, Taigyoo</au><au>O'Brien, Emmett</au><au>Lizotte, Jeremy R.</au><au>Glass, Thomas E.</au><au>Ward, Thomas C.</au><au>Long, Timothy E.</au><au>Leo, Donald J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dielectric relaxation behavior of poly(acrylonitrile- co-methacrylonitrile) microcapsules dispersed in a silicone matrix</atitle><jtitle>Polymer (Guilford)</jtitle><date>2006-05-17</date><risdate>2006</risdate><volume>47</volume><issue>11</issue><spage>4218</spage><epage>4229</epage><pages>4218-4229</pages><issn>0032-3861</issn><eissn>1873-2291</eissn><coden>POLMAG</coden><abstract>The dielectric relaxation behavior of poly(acrylonitrile-
co-methacrylonitrile) dispersed in a cured polydimethyl siloxane (PDMS) matrix as microcapsules was investigated over multiple thermal cycles and at varying concentrations. The copolymer microcapsules contained an isopentane core. In the PDMS matrix this copolymer displayed a pronounced relaxation signal at temperatures above the glass transition of the copolymers due to Maxwell–Wagner–Sillars (MWS) relaxation. The mechanism of MWS relaxation interpreted by the Havriliak–Negami and Kohlrausch–Williams–Watts relaxation functions was found to be very similar to previous studies of neat polyacrylonitrile and its copolymer. The activation energy of the relaxation decreased over successive thermal cycling coincident with a decreasing strength of the relaxation. These observations were attributed to the decreasing concentration of nitrile groups due to intramolecular cyclizations.</abstract><cop>Langley Research Center</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.polymer.2006.03.056</doi><tpages>12</tpages></addata></record> |
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| ispartof | Polymer (Guilford), 2006-05, Vol.47 (11), p.4218-4229 |
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| source | Elsevier ScienceDirect Journals; NASA Technical Reports Server |
| subjects | Applied sciences Chemistry And Materials (General) Copolymer Dielectric relaxation behavior Electrical, magnetic and optical properties Exact sciences and technology Organic polymers Physicochemistry of polymers Polyacrylonitrile Properties and characterization |
| title | Dielectric relaxation behavior of poly(acrylonitrile- co-methacrylonitrile) microcapsules dispersed in a silicone matrix |
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