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Journal of Polymer Science: Polymer Symposia最新文献

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Aromatic polyamides. XIII. effect of the halogen position on the thermal and flammability behavior of halogenated poly (1,3-phenylene-isophthalamide) 芳香族聚酰胺。十三。卤素位置对卤代聚(1,3-苯二苯甲酰胺)热性能和可燃性的影响
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740112
W. T. Whang, M. Kapuscinska, E. M. Pearce
{"title":"Aromatic polyamides. XIII. effect of the halogen position on the thermal and flammability behavior of halogenated poly (1,3-phenylene-isophthalamide)","authors":"W. T. Whang,&nbsp;M. Kapuscinska,&nbsp;E. M. Pearce","doi":"10.1002/polc.5070740112","DOIUrl":"10.1002/polc.5070740112","url":null,"abstract":"<p>Various halogen substituted poly (1,3-phenylene-isophthalamide)s have been prepared. Their glass transition temperature <i>T</i><sub>g</sub> (DSC), thermal decomposition courses (TGA), and flame resistance (oxygen index) are discussed.</p><p>The polyamides substituted with halogen in the meta position to NH group showed higher <i>T</i><sub>g</sub> and better thermal stability than those substituted with the same halogen in the ortho position. All halogenated polyamides studied had fairly good flame resistance characteristics: high oxygen indices and high char yields. Halogenated aromatic polyamides with nitrogen ortho to halogen showed the flammability characteristic: limiting oxygen index = 38 + 61 × (weight loss at initial plateau temperature).</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"109-123"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740112","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75536588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Published Polymer Symposia 已出版的聚合物专题讨论会
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740127
{"title":"Published Polymer Symposia","authors":"","doi":"10.1002/polc.5070740127","DOIUrl":"https://doi.org/10.1002/polc.5070740127","url":null,"abstract":"","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"313-315"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740127","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138078573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic dielectric analysis: Development of techniques for following the curing process of laminating polyester resins 动态介电分析:层压聚酯树脂固化过程跟踪技术的发展
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740109
R. D. Hoffman, J. J. Godfrey, R. J. Ehrig, D. E. Kranbuehl, L. Weller, M. Hoff
{"title":"Dynamic dielectric analysis: Development of techniques for following the curing process of laminating polyester resins","authors":"R. D. Hoffman,&nbsp;J. J. Godfrey,&nbsp;R. J. Ehrig,&nbsp;D. E. Kranbuehl,&nbsp;L. Weller,&nbsp;M. Hoff","doi":"10.1002/polc.5070740109","DOIUrl":"10.1002/polc.5070740109","url":null,"abstract":"<p>DDA measurements made over a wide frequency range with a novel sensor are used to determine the onset of reaction, variation in viscosity, onset of gel, and reaction completion in a series of peroxide-initiated unsaturated polyester resins diluted in styrene monomer. The dielectric measurements provide detailed insights into (he the cure process not available by conventional thermographic techniques.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"71-81"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73911993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Polyetherimides. II. High-temperature solution polymerization Polyetherimides。2高温溶液聚合
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740111
T. Takekoshi, J. E. Kochanowski, J. S. Manello, M. J. Webber
{"title":"Polyetherimides. II. High-temperature solution polymerization","authors":"T. Takekoshi,&nbsp;J. E. Kochanowski,&nbsp;J. S. Manello,&nbsp;M. J. Webber","doi":"10.1002/polc.5070740111","DOIUrl":"10.1002/polc.5070740111","url":null,"abstract":"<p>The polymerization and characterization of the ether-containing aromatic polyimides of the following general structure are presented.</p><p><span>\u0000 <picture>\u0000 <source></source></picture>\u0000 </span></p><p>The polymerization was conducted in one step in homogeneous solution of m-cresol at high temperatures. Typical polyeterimides (PEI) were noncrystalline and showed excellent thermal stability. Among 46 polymers synthesized, only two were crystalline. PEI had glass transition temperatures from 178° to 277°C and exhibited excellent processibility. Many PEI were also soluble in dipolar aprotic solvents and chlorinated hydrocarbons.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"93-108"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740111","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89187100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 58
The zero-order kinetics of acetaldehyde thermal generation from polyethylene terephthalate 聚对苯二甲酸乙二醇酯热生成乙醛的零级动力学
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740110
G. W. Halek
{"title":"The zero-order kinetics of acetaldehyde thermal generation from polyethylene terephthalate","authors":"G. W. Halek","doi":"10.1002/polc.5070740110","DOIUrl":"10.1002/polc.5070740110","url":null,"abstract":"<p>The thermal decomposition of polyethylene terephthalale has been examined by healing isothermally in a high-mass reaction chamber and collecting the evolved acetaldehyde on a GC column for quantization. Kinetics were determined at lime intervals up to 1 h for temperatures 225°C, 240°C, 250°C, 260°C, 265°C, 270°C, 280°C, and 300°C. The rate of acetaldehyde evolution was found to be directly proportional to time of reaction at each temperature, thus fitting a zero-order reaction. The Arrhenius plot of the data yielded a straight line above the melting point with a slope different from the straight line for reaction rates below the melting point. The change in slopes occurred around the crystalline melting point. The following thermodynamic values were found above and below the melting point, respectively: <i>E<sub>A</sub></i>, 37.5 and 8.2 kcal/mol; Δ<i>S</i><sub>A</sub>, + 1.5 and −54 e.u.; <i>A</i>, 0.68 × 10<sup>14</sup> and 0.43 × 10<sup>2</sup> sec<sup>−1</sup>. Possible mechanistic implications are discussed.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"83-92"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740110","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83887028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Exploratory ring-opening polymerization. XIIL† ring-opening polymerization of 2-vinyl cyclic sulfones‡ 探索性开环聚合。2-乙烯基环砜开环聚合研究
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740119
Iwhan Cho, Sang-Keun Kim, Myong-Hoon Lee
{"title":"Exploratory ring-opening polymerization. XIIL† ring-opening polymerization of 2-vinyl cyclic sulfones‡","authors":"Iwhan Cho,&nbsp;Sang-Keun Kim,&nbsp;Myong-Hoon Lee","doi":"10.1002/polc.5070740119","DOIUrl":"10.1002/polc.5070740119","url":null,"abstract":"<p>2-Vinyllhiolane-1,1-dioxide (Ia) and 2-vinylthiane-1,1-dioxide(Ib) have been prepared and polymerized with free radical initiators to obtain poly(sulfonyl-hex-2-enylene) (IIa) and poly(sulfonyl-hept-2-enyIene-<i>co</i>-2-vinylthiane-1,1-dioxide) (IIb), respectively, via a ring-opening mechanism. Structures of the polymers are supported by infrared and <sup>1</sup>H-NMR spectroscopy. Poly(sulfonyl-hex-2-enylene) was insoluble in ordinary organic solvents, but soluble in concentrated sulfuric acid or trifluoroacetic acid, and was white amorphous powder, softening at 168°C. Degradation occurred at 294°C under N<sub>2</sub>. Ia copolymerized with certain vinyl monomers, such as ethyl acrylate, but its copolymerization behavior was different from those of normal vinyl monomers.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"219-226"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740119","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80044195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Photoredox reaction of functionalized polyelectrolytes 功能化聚电解质的光氧化还原反应
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740104
Yotaro Morishima, Shun-Ichi Nozakura
{"title":"Photoredox reaction of functionalized polyelectrolytes","authors":"Yotaro Morishima,&nbsp;Shun-Ichi Nozakura","doi":"10.1002/polc.5070740104","DOIUrl":"10.1002/polc.5070740104","url":null,"abstract":"<p>The electron transfer reaction from excited phenanthrene to acceptors was shown to be modified markedly when the phenanthrene unit was covalently linked to polyelectrolytes. (1) Such functionalized polyelectrolytes were shown to form hydrophobic microdomains in aqueous solution. (2) Uptake of amphiphilic acceptor substrates by the microdomain was demonstrated and was shown to accelerate the forward electron transfer reaction. (3) The electrostatic effect of microdomain was shown to effect the photoinduced charge separation. (4) The electrostatic potential of the microdomain was estimated to be comparable with that of surfactant micelles.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75426369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Effects of bulky substituents on oxygen permeation behaviors of polystyrene-based polymers† 大体积取代基对聚苯乙烯基聚合物氧渗透行为的影响
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740125
Y. Kawakami, H. Kamiya, Y. Yamashita
{"title":"Effects of bulky substituents on oxygen permeation behaviors of polystyrene-based polymers†","authors":"Y. Kawakami,&nbsp;H. Kamiya,&nbsp;Y. Yamashita","doi":"10.1002/polc.5070740125","DOIUrl":"10.1002/polc.5070740125","url":null,"abstract":"<p>Polymers of β-cyclodextrinyl substituted styrene and 4′-oligodimethylsiloxanyl-4-vinyldiphenyl were synthesized. Their oxygen perm selectivity was studied from the viewpoint of investigating the effects of the introduction of bulky <i>p</i>-substituents to polystyrene on their permeation behaviors. The bulky substituents were quite effective in enhancing the permeability; however, the selectivity in permeation decreased with the increase in permeability.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"291-302"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740125","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76551013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
NMR study of 9-anthranylmethyl hexafluorophosphate. Polymerization of styrene monomers† 9-蒽基甲基六氟磷酸的核磁共振研究。苯乙烯单体的聚合†
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740118
V. D. Toncheva, R. S. Velichkova, I. M. Panayotov, L. P. Markova
{"title":"NMR study of 9-anthranylmethyl hexafluorophosphate. Polymerization of styrene monomers†","authors":"V. D. Toncheva,&nbsp;R. S. Velichkova,&nbsp;I. M. Panayotov,&nbsp;L. P. Markova","doi":"10.1002/polc.5070740118","DOIUrl":"10.1002/polc.5070740118","url":null,"abstract":"<p>The primary carbenium salt 9-anihranylmethyl hexafluorophosphate is characterized by <sup>1</sup>H- and <sup>13</sup>C-NMR spectroscopy. The results show that in the temperature range −60°-15°C the initiator exists as a classical carbenium ion and a protonated anthracenium ion. At higher temperatures the reactions of self-alkylation and disproportionation proceed, giving bianthracenes, hydroanthracenes, and other dimer forms.</p><p>The polymerization of α-methylstyrene and <i>p</i>-methoxystyrene, initiated by 9-anthranylmethyl hexafluorophosphate, is investigated. The mechanism of initiation, the stereochemical configuration, and the end groups of the polymer chains are determined.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"205-217"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89590338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On predicting free radical polymerizability of allyl monomers. MINDO/3 and 13C NMR results 烯丙基单体自由基聚合性的预测。MINDO/3和13C核磁共振结果
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740121
Rajeev A. Vaidya, Lon J. Mathias
{"title":"On predicting free radical polymerizability of allyl monomers. MINDO/3 and 13C NMR results","authors":"Rajeev A. Vaidya,&nbsp;Lon J. Mathias","doi":"10.1002/polc.5070740121","DOIUrl":"10.1002/polc.5070740121","url":null,"abstract":"<p>Two new methods of predicting free radical polymerizability of allyl monomers have been developed. MINDO/3 calculations of eigenvalues for the C—H bond a to the atlyl substituent allow comparison of relative bond strengths. Monomers known to undergo degradative chain transfer display more positive eigenvalues correlating with weaker α-C—H bonds. Polymerizable monomers have more negative eigenvalues and stronger α-C—H bonds. The latter possess strongly polarized or protonated substituents not capable of resonance stabilization of a chain-terminating allyl radical. The inductive effect of such substituents on the <sup>13</sup>C NMR peaks of the vinyl carbons is the basis for the empirical spectroscopic method. Allyl compounds display β-carbon peaks farther downfield than the γ-carbon peaks. Polymerizable monomers generally have β peaks shifted upfield and γ peaks shifted downfield from those of poor monomers. This effect brings the two peaks closer together in the spectrum. Thus, the smaller the Δδ value (δ<sub>β</sub> − δ<sub>γ</sub>), the more likely the monomer is to polymerize well. Monomers with intermediate eigenvalues or Δδ values may polymerize with difficulty or only under special conditions. Combined use of the theoretical and empirical techniques can allow prediction of inherent polymerizability and can facilitate evaluation of reaction media most favorable to polymer formation.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":"74 1","pages":"243-251"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740121","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73022601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
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