Polycondensation Kinetics: 2. Time-Dependent29Si NMR Spectra of Poly-Dimethyldimethoxysilane
The polycondensation of dimethyldimethoxysilane has been studied by 29 Si NMR to high degrees of conversion at pH 2.8. The relative concentrations of nonbonded Si atoms ( D 0 ) and bound by one ( D 1 ) and two ( D 2 ) Si–O–Si bonds have been determined from the integrated intensities of the multiple...
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| Veröffentlicht in: | High energy chemistry 2020, Vol.54 (3), p.155-163 |
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| creator | Kim, I. P. Chernyak, A. V. Benderskii, V. A. |
| description | The polycondensation of dimethyldimethoxysilane has been studied by
29
Si NMR to high degrees of conversion at pH 2.8. The relative concentrations of nonbonded Si atoms (
D
0
) and bound by one (
D
1
) and two (
D
2
) Si–O–Si bonds have been determined from the integrated intensities of the multiplets assigned to them. The measurement results have been considered in terms of the kinetic scheme proposed in the first paper. It has been found that the
D
0
(
t
),
D
1
(
t
), and
D
2
(
t
) curves coincide with those measured for the ratio of the constants of competing processes of aggregation and addition of monomers
k
≈ 0.15. The time-dependent molecular mass distributions have been determined with allowance for chain termination during the formation of cyclic and entangled oligomers. |
| doi_str_mv | 10.1134/S001814392003008X |
| format | Article |
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29
Si NMR to high degrees of conversion at pH 2.8. The relative concentrations of nonbonded Si atoms (
D
0
) and bound by one (
D
1
) and two (
D
2
) Si–O–Si bonds have been determined from the integrated intensities of the multiplets assigned to them. The measurement results have been considered in terms of the kinetic scheme proposed in the first paper. It has been found that the
D
0
(
t
),
D
1
(
t
), and
D
2
(
t
) curves coincide with those measured for the ratio of the constants of competing processes of aggregation and addition of monomers
k
≈ 0.15. The time-dependent molecular mass distributions have been determined with allowance for chain termination during the formation of cyclic and entangled oligomers.</description><identifier>ISSN: 0018-1439</identifier><identifier>EISSN: 1608-3148</identifier><identifier>DOI: 10.1134/S001814392003008X</identifier><language>eng</language><publisher>Moscow: Pleiades Publishing</publisher><subject>Chemistry ; Chemistry and Materials Science ; General Aspects ; NMR ; Nuclear magnetic resonance ; Oligomers ; Physical Chemistry ; Time dependence</subject><ispartof>High energy chemistry, 2020, Vol.54 (3), p.155-163</ispartof><rights>Pleiades Publishing, Ltd. 2020</rights><rights>Pleiades Publishing, Ltd. 2020.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c161X-dc55ceb247cc382c49cfbd1bcbc7ab19a704b9bda4fdba9ce1d201cfb77f8b123</citedby><cites>FETCH-LOGICAL-c161X-dc55ceb247cc382c49cfbd1bcbc7ab19a704b9bda4fdba9ce1d201cfb77f8b123</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1134/S001814392003008X$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1134/S001814392003008X$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,777,781,27905,27906,41469,42538,51300</link.rule.ids></links><search><creatorcontrib>Kim, I. P.</creatorcontrib><creatorcontrib>Chernyak, A. V.</creatorcontrib><creatorcontrib>Benderskii, V. A.</creatorcontrib><title>Polycondensation Kinetics: 2. Time-Dependent29Si NMR Spectra of Poly-Dimethyldimethoxysilane</title><title>High energy chemistry</title><addtitle>High Energy Chem</addtitle><description>The polycondensation of dimethyldimethoxysilane has been studied by
29
Si NMR to high degrees of conversion at pH 2.8. The relative concentrations of nonbonded Si atoms (
D
0
) and bound by one (
D
1
) and two (
D
2
) Si–O–Si bonds have been determined from the integrated intensities of the multiplets assigned to them. The measurement results have been considered in terms of the kinetic scheme proposed in the first paper. It has been found that the
D
0
(
t
),
D
1
(
t
), and
D
2
(
t
) curves coincide with those measured for the ratio of the constants of competing processes of aggregation and addition of monomers
k
≈ 0.15. The time-dependent molecular mass distributions have been determined with allowance for chain termination during the formation of cyclic and entangled oligomers.</description><subject>Chemistry</subject><subject>Chemistry and Materials Science</subject><subject>General Aspects</subject><subject>NMR</subject><subject>Nuclear magnetic resonance</subject><subject>Oligomers</subject><subject>Physical Chemistry</subject><subject>Time dependence</subject><issn>0018-1439</issn><issn>1608-3148</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp1kF1LwzAUhoMoOKc_wLuC19VzkmxNvZPNL5wfuAm7EEqSptrRJTXpwP57Wyd4IV69F-_zvAcOIccIp4iMn80BUCBnKQVgAGK5QwY4BhEz5GKXDPo67vt9chDCCgBGHTcgr0-uarWzubFBNqWz0V1pTVPqcB7R02hRrk08NbXpgYam8zJ6uH-O5rXRjZeRK6Lej6cd1ry3Vf6d7rMNZSWtOSR7hayCOfrJIXm5ulxMbuLZ4_Xt5GIWaxzjMs71aKSNojzRmgmqeaoLlaPSSidSYSoT4CpVueRFrmSqDeYUsGOSpBAKKRuSk-1u7d3HxoQmW7mNt93JjHJIxJiBYB2FW0p7F4I3RVb7ci19myFk_ROzP0_sHLp1QsfaN-N_l_-XvgCh53T4</recordid><startdate>2020</startdate><enddate>2020</enddate><creator>Kim, I. P.</creator><creator>Chernyak, A. V.</creator><creator>Benderskii, V. A.</creator><general>Pleiades Publishing</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>2020</creationdate><title>Polycondensation Kinetics: 2. Time-Dependent29Si NMR Spectra of Poly-Dimethyldimethoxysilane</title><author>Kim, I. P. ; Chernyak, A. V. ; Benderskii, V. A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c161X-dc55ceb247cc382c49cfbd1bcbc7ab19a704b9bda4fdba9ce1d201cfb77f8b123</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Chemistry</topic><topic>Chemistry and Materials Science</topic><topic>General Aspects</topic><topic>NMR</topic><topic>Nuclear magnetic resonance</topic><topic>Oligomers</topic><topic>Physical Chemistry</topic><topic>Time dependence</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kim, I. P.</creatorcontrib><creatorcontrib>Chernyak, A. V.</creatorcontrib><creatorcontrib>Benderskii, V. A.</creatorcontrib><collection>CrossRef</collection><jtitle>High energy chemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kim, I. P.</au><au>Chernyak, A. V.</au><au>Benderskii, V. A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Polycondensation Kinetics: 2. Time-Dependent29Si NMR Spectra of Poly-Dimethyldimethoxysilane</atitle><jtitle>High energy chemistry</jtitle><stitle>High Energy Chem</stitle><date>2020</date><risdate>2020</risdate><volume>54</volume><issue>3</issue><spage>155</spage><epage>163</epage><pages>155-163</pages><issn>0018-1439</issn><eissn>1608-3148</eissn><abstract>The polycondensation of dimethyldimethoxysilane has been studied by
29
Si NMR to high degrees of conversion at pH 2.8. The relative concentrations of nonbonded Si atoms (
D
0
) and bound by one (
D
1
) and two (
D
2
) Si–O–Si bonds have been determined from the integrated intensities of the multiplets assigned to them. The measurement results have been considered in terms of the kinetic scheme proposed in the first paper. It has been found that the
D
0
(
t
),
D
1
(
t
), and
D
2
(
t
) curves coincide with those measured for the ratio of the constants of competing processes of aggregation and addition of monomers
k
≈ 0.15. The time-dependent molecular mass distributions have been determined with allowance for chain termination during the formation of cyclic and entangled oligomers.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S001814392003008X</doi><tpages>9</tpages></addata></record> |
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| issn | 0018-1439 1608-3148 |
| language | eng |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Chemistry Chemistry and Materials Science General Aspects NMR Nuclear magnetic resonance Oligomers Physical Chemistry Time dependence |
| title | Polycondensation Kinetics: 2. Time-Dependent29Si NMR Spectra of Poly-Dimethyldimethoxysilane |
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