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L-Asparaginase from Escherichia Coli II and Erwinia Carotovora Bound to Poly(Methyl Methacrylate) 与聚甲基丙烯酸甲酯结合的l -天冬酰胺酶
Journal of Polymer Science: Polymer Symposia Pub Date : 2007-03-08 DOI: 10.1007/978-1-4615-8897-9_60
L. Hersh
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引用次数: 0
Synthesis of poly (vinylcatechols)† 聚乙烯基儿茶酚的合成
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740120
William H. Daly, Saad Moulay
{"title":"Synthesis of poly (vinylcatechols)†","authors":"William H. Daly,&nbsp;Saad Moulay","doi":"10.1002/polc.5070740120","DOIUrl":"10.1002/polc.5070740120","url":null,"abstract":"<p>Five vinylcatechol precursors have been synthesized by either alcohol dehydration or Wittig coupling techniques. Dehydration of the appropriate <i>sec</i>-phenethyl alcohol is the most efficient synthetic approach: the following monomers (yields) are reported: 5-vinyl-1,3-benzodioxole, I (63%); 3,4-dimethoxystyrene, II (45%); 2,3-dimethoxystyrene, III (85%);6-vinyl-1,4-benzodioxane.IV(65%); and4-vinyl-l,3-benzodioxole, V(50%). The monomers can be converted by free-radical techniques to polymers with molecular weights up to 95,000. Monomers I, II, IV, and V polymerized in the presence of stannic chloride; monomers I, III, and IV yielded polymers upon treatment with butyllithium. With the exception of poly IV, the blocking groups can be removed by treatment with boron trichloride followed by methanolysis to liberate poly(3-vinyl- or 4-vinylcatechol). Suprisingly, the stability of the catechol polymers depends upon the substituent distribution; poly(3-vinylcatechol) is more stable than any polycatechol previously reported. It is soluble in methanol, autooxidizes very slowly, but can be oxidized by ceric ammonium nitrate to poly(3-vinyl-1,2-benzoquinone).</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79443316","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: 16
Synthesis of acetylene-terminated monomers using a polymer-supported palladium catalyst 用聚合物负载钯催化剂合成端乙炔单体
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740107
D. L. Trumbo, C. S. Marvel
{"title":"Synthesis of acetylene-terminated monomers using a polymer-supported palladium catalyst","authors":"D. L. Trumbo,&nbsp;C. S. Marvel","doi":"10.1002/polc.5070740107","DOIUrl":"10.1002/polc.5070740107","url":null,"abstract":"<p>A single-crysial polyethylene-bound palladium catalys: was prepared and used in the synthesis of acelylene-terminated monomers.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85079935","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: 1
A polymeric triarylmethane dye as a sensitizer for photoconductivity 三芳基甲烷聚合物染料，作为光导的增敏剂
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740115
Smarajit Mitra
{"title":"A polymeric triarylmethane dye as a sensitizer for photoconductivity","authors":"Smarajit Mitra","doi":"10.1002/polc.5070740115","DOIUrl":"10.1002/polc.5070740115","url":null,"abstract":"<p>A polymeric analogue of crystal violet in which the triarylmethane moiety is pendent from a polyester backbone has been examined as a sensitizer for photoconductivity in poly-<i>N</i>-vinyicarbazole. In both positive and negative surface charging modes, the dark decay rates increase linearly with sensitizer concentration, but are lower than those for monomeric crystal violet sensitization. The photodecay rates, in both modes, show optimal concentration dependence and are higher than those for monomeric crystal violet.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82829914","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
C.G. overberger on his 65th birthday C.G.奥弗伯格65岁生日
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740103
Herman F. Mark
{"title":"C.G. overberger on his 65th birthday","authors":"Herman F. Mark","doi":"10.1002/polc.5070740103","DOIUrl":"10.1002/polc.5070740103","url":null,"abstract":"","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"109633018","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
Polvnucleotide analogs with PEI or PEI/polyethyloxazoline backbones 具有PEI或PEI/聚羟唑啉骨架的多核苷酸类似物
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740108
A. G. Ludwick, K. S. Robinson, J. McCloud Jr.
{"title":"Polvnucleotide analogs with PEI or PEI/polyethyloxazoline backbones","authors":"A. G. Ludwick,&nbsp;K. S. Robinson,&nbsp;J. McCloud Jr.","doi":"10.1002/polc.5070740108","DOIUrl":"10.1002/polc.5070740108","url":null,"abstract":"<p>The synthesis and characterization of uracil- and thy mine-containing polynucleotide analogs with a linear polyethylenimine backbone is described. Hypochromicity is observed for these analogs in DMSO and in DMSO/H<sub>2</sub>O solutions and found lo increase as the percent water increases. The influence of water on the 240- to 280-nm absorptions of the analogs and their monomer models is correlated with the mobiliiy of the nucleic-acid-base-con tain ing pendant to the polymeric backbone. An impure 5-fluorouracil analog has been prepared, and its increased solubility in water relative to the corresponding uracil analog has been noted. A thy mine-containing analog with a PEI/PEOXZ backbone has been synthesized. The analog consists of water-soluble and insoluble forms characterized by NMR.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73803782","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
Conformational analysis of poly(tetrahydrofurandiyls) 聚四氢呋喃二基的构象分析
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740122
J. A. Moore, Roice Wille, Kenneth J. Miller
{"title":"Conformational analysis of poly(tetrahydrofurandiyls)","authors":"J. A. Moore,&nbsp;Roice Wille,&nbsp;Kenneth J. Miller","doi":"10.1002/polc.5070740122","DOIUrl":"10.1002/polc.5070740122","url":null,"abstract":"<p>The stereoisomeric configurations of poly(2,5-tetraliydrofurandiyl), 1, and poly(2,3-tetrahydrofurandiyl), 2, have been investigated by conformational analysis. Similar results were obtained for 1 and 2, Threodiisotactic (tit) and erythrodisyndiotactic (est) configurations could form low energy helical conformations, whereas erythrodiisotactic (eit) and threodisyndiotactic (tst) configurations generally formed low energy linear conformations. Helical conformations of I placed oxygen atoms at the interior of the helices, but helical conformations of 2 placed oxygen atoms more toward the periphery. The results of ion-binding experiments are interpreted in terms of the results of conformational analysis. Ion-binding experiments are consistent with the suggestion that configurations that can form low energy, helical conformations with oxygen atoms at the interior of the helices could bind cations efficiently. Configurations that can form only low energy linear conformations, or that form helices with oxygen atoms toward the periphery of the helices, should be inefficient in binding cations.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740122","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84712596","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
Mass spectrometric detection of cyclic sulfides in the polycondensation of dibromoalkanes with dithiols 二溴烷烃与二硫醇缩聚反应中环硫化物的质谱检测
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740124
G. Montaudo, E. Scamporrino, C. Puglisi, D. Vitalini
{"title":"Mass spectrometric detection of cyclic sulfides in the polycondensation of dibromoalkanes with dithiols","authors":"G. Montaudo,&nbsp;E. Scamporrino,&nbsp;C. Puglisi,&nbsp;D. Vitalini","doi":"10.1002/polc.5070740124","DOIUrl":"10.1002/polc.5070740124","url":null,"abstract":"<p>MS analysis was used to identify the cyclic oligomers formed in the polycondensation reactions of dibromoalkanes with dithiols. Cyclic oligomers with only an even number of repeating units are detected among the poly condensation reaction products.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740124","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90953603","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
Dedication 奉献
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740102
William H. Daly, James A. Moore, Eli M. Pearce, Joseph C. Salamone
{"title":"Dedication","authors":"William H. Daly,&nbsp;James A. Moore,&nbsp;Eli M. Pearce,&nbsp;Joseph C. Salamone","doi":"10.1002/polc.5070740102","DOIUrl":"https://doi.org/10.1002/polc.5070740102","url":null,"abstract":"","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138078014","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
High flex, ozone-resistant polymers of higher α-olefins† 高α-烯烃†的高弯曲、耐臭氧聚合物
Journal of Polymer Science: Polymer Symposia Pub Date : 1986-01-01 DOI: 10.1002/polc.5070740114
Joginder Lal, Paul H. Sandstrom, Michael L. Senyek
{"title":"High flex, ozone-resistant polymers of higher α-olefins†","authors":"Joginder Lal,&nbsp;Paul H. Sandstrom,&nbsp;Michael L. Senyek","doi":"10.1002/polc.5070740114","DOIUrl":"10.1002/polc.5070740114","url":null,"abstract":"<p>Ozone resistance and high flex life are some of the important features of elastomers needed in the rubber industry. EPDM, a terpolymer of ethylene, propylene, and small amounts of a nonconjugated diene, has a saturated carbon-carbon backbone and therefore shows excellent resistance to ozone and aging, and good flex properties. However, butyl rubber (1IR) has a small amount of unsaturation in its carbon-carbon backbone and consequently does not exhibit as good ozone resistance and aging characteristics as EPDM. We discovered a family of new rubbers named Hexsyn<sup>TM</sup>, which were synthesized by copolymerizing higher α-olefins (C<sub>4</sub>-C<sub>10</sub>) with a mixture of 4-methyl- and 5-methyl-1,4-hexadienes. One outstanding Hexsyn™ rubber is a copolymer of 4-hexene and the 5-methyl-1,4-hexadiene. This copolymer uniquely combines the useful properties of EPDM and butyl. Outstanding features are excellent flex life, excellent ozone resistance, good compression set resistance, and high damping.</p><p>Due to its excellent flex life, Hexsyn<sup>TM(</sup> (hexene copolymer) has been found useful in fabricating experimental pumping diaphragms of air-driven artificial hearts of calves and also for left ventricle assist devices. This rubber has found application as a flexing element in artificial finger joints for damaged or diseased human fingers.</p>","PeriodicalId":16867,"journal":{"name":"Journal of Polymer Science: Polymer Symposia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/polc.5070740114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90653160","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
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