Acta Polymerica最新文献_第8页

Synthesis and properties of new polyimides derived from bis[4-(4-aminophenoxy)phenyl]diphenylmethane with various dianhydrides 双[4-(4-氨基苯氧基)苯基]二苯基甲烷与各种二酐合成新型聚酰亚胺及其性能

Acta Polymerica Pub Date : 1999-09-16 DOI: 10.1002/(SICI)1521-4044(19990901)50:9<332::AID-APOL332>3.0.CO;2-1

Der-Jang Liaw, Been-Yang Liaw, Chao-Min Yang

{"title":"Synthesis and properties of new polyimides derived from bis[4-(4-aminophenoxy)phenyl]diphenylmethane with various dianhydrides","authors":"Der-Jang Liaw, Been-Yang Liaw, Chao-Min Yang","doi":"10.1002/(SICI)1521-4044(19990901)50:9<332::AID-APOL332>3.0.CO;2-1","DOIUrl":"10.1002/(SICI)1521-4044(19990901)50:9<332::AID-APOL332>3.0.CO;2-1","url":null,"abstract":"A new kink diamine, bis[4-(4-aminophenoxy)phenyl]diphenylmethane (BAPDM), bearing diphenylmethylene linkage was reacted with various aromatic dianhydrides to prepare the corresponding new polyimides via the poly(amic acid) precursors and thermal or chemical imidization. The poly(amic acid)s were produced with moderate to high inherent viscosities of 0.96–1.68 dl g–1. All the poly(amic acid)s films could be obtained by solution-cast from N,N-dimethylacetamide (DMAc) solutions and thermally converted into transparent, flexible, and tough polyimide films. The wide-angle X-ray diffraction diagrams revealed that all the polyimides showed amorphous character. These polyimide films had a tensile strength of range 75–147 MPa and tensile modulus of 2.4–3.0 GPa. Polymers PI-3, PI-5 and PI-6 showed excellent solubility in a variety of solvents such as N-methyl-2-pyrrolidinone (NMP), DMAc, N,N-dimethylformamide (DMF), dimethyl sulfoxide, γ-butyrolactone, pyridine, cyclohexanone and tetrahydrofuran. These polyimides had glass transition temperatures between 248–331°C. The thermogravimetric analysis revealed that these polyimides exhibited good thermal stability with polymer decomposition temperature in excess of 500°C in nitrogen and air atmosphere. They had 10% weight loss temperatures in the range of 542–564°C and 549–572°C in nitrogen and air, respectively.","PeriodicalId":7162,"journal":{"name":"Acta Polymerica","volume":"50 9","pages":"332-336"},"PeriodicalIF":0.0,"publicationDate":"1999-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79941107","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

Polymer ultradrawability: the crucial role of α-relaxation chain mobility in the crystallites 聚合物的超拉伸性:α-弛豫链迁移率在晶体中的关键作用

Acta Polymerica Pub Date : 1999-08-18 DOI: 10.1002/(SICI)1521-4044(19990801)50:8<271::AID-APOL271>3.0.CO;2-Y

W.-G. Hu, K. Schmidt-Rohr

{"title":"Polymer ultradrawability: the crucial role of α-relaxation chain mobility in the crystallites","authors":"W.-G. Hu, K. Schmidt-Rohr","doi":"10.1002/(SICI)1521-4044(19990801)50:8<271::AID-APOL271>3.0.CO;2-Y","DOIUrl":"10.1002/(SICI)1521-4044(19990801)50:8<271::AID-APOL271>3.0.CO;2-Y","url":null,"abstract":"An explanation of the varying (ultra)drawability of semicrystalline polymers is proposed, based on NMR evidence of αc-relaxation-associated helical jumps and chain diffusion through the crystallites of polyethylene and several similarly “αc-mobile” polymers; these include isotactic polypropylene, poly(ethylene oxide), poly(oxymethylene), poly(tetrafluoroethylene), poly(vinyl alcohol), and several others. The chain motions provide a mechanism by which hot drawing of these polymers can extend an initially formed fiber morphology by an order of magnitude to draw ratios > 30, without melting. A second class of polymers, including nylons, poly(ethylene terephthalate), syndiotactic polypropylene, isotactic polystyrene, and isotactic poly(1-butene) (form I) lack a crystalline α-relaxation and the associated chain mobility. Therefore, these polymers are “crystal fixed” and drawability is limited to draw ratios < 14, arising mostly from break-up of crystalline lamellae and deformation of the amorphous regions. On this basis, we can explain which polymers are drawable to high draw ratios, given a sufficiently low level of entanglement. The motion through the crystallites is thermally activated and the applied stress only biases the direction of the jumps; this explains the crucial role of temperature and rate in tensile drawing and solid-state extrusion processes. The behavior of the crystal-fixed, poorly drawable polymers strongly suggests that melting, straight chain pull-out, and sliding on crystal planes are not significantly operative during ultradrawing, and that weak intermolecular forces are not a sufficient condition for ultradeformation. Various stages of drawing are distinguished and other models of ultradrawability are discussed critically.","PeriodicalId":7162,"journal":{"name":"Acta Polymerica","volume":"50 8","pages":"271-285"},"PeriodicalIF":0.0,"publicationDate":"1999-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84842880","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: 158

Polyamides incorporating furan moieties. 1. Interfacial polycondensation of 2,2′-bis(5-chloroformyl-2-furyl)propane with 1,6-diaminohexane 含有呋喃基团的聚酰胺。1. 2,2 ' -双(5-氯甲酰基-2-呋喃基)丙烷与1,6-二氨基己烷的界面缩聚

Acta Polymerica Pub Date : 1999-08-18 DOI: 10.1002/(SICI)1521-4044(19990801)50:8<293::AID-APOL293>3.0.CO;2-I

S. Gharbi, A. Gandini

引用次数: 23

Synthesis of sugar-containing hydrophilic porous polymer supports via suspension polymerization 悬浮聚合法制备含糖亲水多孔聚合物载体

Acta Polymerica Pub Date : 1999-08-18 DOI: 10.1002/(SICI)1521-4044(19990801)50:8<286::AID-APOL286>3.0.CO;2-A

T. Rohr, S. Knaus, D.C. Sherrington, H. Gruber

{"title":"Synthesis of sugar-containing hydrophilic porous polymer supports via suspension polymerization","authors":"T. Rohr,  S. Knaus, D.C. Sherrington, H. Gruber","doi":"10.1002/(SICI)1521-4044(19990801)50:8<286::AID-APOL286>3.0.CO;2-A","DOIUrl":"10.1002/(SICI)1521-4044(19990801)50:8<286::AID-APOL286>3.0.CO;2-A","url":null,"abstract":"Using different porogens and crosslinkers for 3-O-methacryloyl-1,2;5,6-di-O-isopropylidene-α-D-glucofuranose, porous polymer beads having surface areas of up to 300 m2g–1 were synthesized by suspension polymerization. After subsequent removal of the protecting groups, a hydrophilic sugar-containing resin was obtained. In the case when the initial polymer had only very small pores, after hydrolysis, an almost non-porous resin was recovered. With initially large pores, the pore structure of the resin remained unchanged. For resins with medium pore sizes, the pore volume and surface area of the unprotected resin were dependent of the degree of hydrolysis. In fact a linear relationship between surface area and degree of hydrolysis could be observed. Furthermore, this relationship was reversible, i. e. after reprotection of partly or fully hydrolyzed resins, the original pore structure of the protected polymer could be recovered. Depending on the degree of hydrolysis, porous resins of various hydrophilicity, containing reactive hydroxyl groups suitable for further derivatization have been synthesized.","PeriodicalId":7162,"journal":{"name":"Acta Polymerica","volume":"50 8","pages":"286-292"},"PeriodicalIF":0.0,"publicationDate":"1999-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88377917","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

Effect of monomer architecture on segmental interaction parameters of binary blends involving copolymers of cyclohexyl methacrylate, methyl methacrylate and styrene derivatives 单体结构对甲基丙烯酸环己酯、甲基丙烯酸甲酯和苯乙烯衍生物共聚物二元共混物节段相互作用参数的影响

Acta Polymerica Pub Date : 1999-08-18 DOI: 10.1002/(SICI)1521-4044(19990801)50:8<304::AID-APOL304>3.0.CO;2-9

A. Múgica, M. Barral, J.A. Pomposo, M. Cortázar

{"title":"Effect of monomer architecture on segmental interaction parameters of binary blends involving copolymers of cyclohexyl methacrylate, methyl methacrylate and styrene derivatives","authors":"A. Múgica, M. Barral, J.A. Pomposo, M. Cortázar","doi":"10.1002/(SICI)1521-4044(19990801)50:8<304::AID-APOL304>3.0.CO;2-9","DOIUrl":"10.1002/(SICI)1521-4044(19990801)50:8<304::AID-APOL304>3.0.CO;2-9","url":null,"abstract":"The phase behavior of binary blends of poly(cyclohexyl methacrylate-co-methyl methacrylate) (P(CHMA-co-MMA)) copolymers with poly(α-methylstyrene) (PAMS) and poly(p-methylstyrene) (PPMS) has been determined experimentally and compared to that of the P(CHMA-co-MMA)/PS system. The enthalpic and entropic parts of the segmental interaction parameter for each binary monomer pair involved have been determined from a fit of the lower critical solution temperature (LCST) behavior of these systems, with the aid of Flory-Huggins (FH) theory which incorporates temperature dependent interaction parameters. The results reveal that the strength of the interaction with the copolymer P(CHMA-co-MMA) decreases in the following order: PAMS > PS > PPMS. These differences are also illustrated in the glass transition (Tg)-composition curves of the above systems as well as in analog calorimetry results and scanning electron microscopy (SEM) studies. Good agreement is obtained when various theoretical miscibility windows for binary blends of copolymers involving CHMA, MMA and styrene derivatives are compared to experimental data. Thus it is shown that the subtle difference of monomer structures is captured to a good degree by the segmental interaction parameters derived from phase behavior.","PeriodicalId":7162,"journal":{"name":"Acta Polymerica","volume":"50 8","pages":"304-311"},"PeriodicalIF":0.0,"publicationDate":"1999-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77767470","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

Luminescence properties of poly[1,4-phenylenevinylene-co-(2,3,5,6-tetramethyl-1,4-phenylenevinylene)] – Improved EL efficiency through partial disruption of main chain π-conjugation by substituents 聚[1,4-苯基乙烯-co-(2,3,5,6-四甲基-1,4-苯基乙烯)]的发光性质-取代基通过部分破坏主链π共轭提高了发光效率

Acta Polymerica Pub Date : 1999-08-18 DOI: 10.1002/(SICI)1521-4044(19990801)50:8<298::AID-APOL298>3.0.CO;2-Z

Sung-Jae Chung, Dong Won Lee, Dong-Keun Oh, Cheol Eui Lee, Jung-Il Jin

{"title":"Luminescence properties of poly[1,4-phenylenevinylene-co-(2,3,5,6-tetramethyl-1,4-phenylenevinylene)] – Improved EL efficiency through partial disruption of main chain π-conjugation by substituents","authors":"Sung-Jae Chung, Dong Won Lee, Dong-Keun Oh, Cheol Eui Lee, Jung-Il Jin","doi":"10.1002/(SICI)1521-4044(19990801)50:8<298::AID-APOL298>3.0.CO;2-Z","DOIUrl":"10.1002/(SICI)1521-4044(19990801)50:8<298::AID-APOL298>3.0.CO;2-Z","url":null,"abstract":"Two copolymers of poly(p-phenylenevinylene) (PPV) containing low levels (0.8 and 3.6 mole %) of the 2,3,5,6-tetramethyl-1,4-phenylenevinylene (TMPV) units were prepared via the sulfonium salt precursor route. The luminescence properties of the two copolymers were studied in detail mainly for photoluminescence (PL) and electroluminescence (EL) characteristics in comparison with those of PPV itself. Inclusion of low levels of TMPV units improves EL efficiency by more than 10 times when a single layer device was constructed using ITO coated glass anode and aluminum metal cathode. This was explained by the possible partial disruption of main chain π-conjugation by the TMPV units which force its phenylene or vinylene structure to twist out of the coplanar structure in order to avoid of the steric repulsion between the methyl and vinyl protons in the TMPV units. The UV-vis, PL and EL spectra of the copolymers support this supposition.","PeriodicalId":7162,"journal":{"name":"Acta Polymerica","volume":"50 8","pages":"298-303"},"PeriodicalIF":0.0,"publicationDate":"1999-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73959752","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: 3

Polyelectrolyte complexes. III. Binding characteristics of some polydentate anionic azo dyes to polycations with N,N-dimethyl-2-hydroxypropylene ammonium chloride units in the main chain 聚电解质复合物。3一些多齿阴离子偶氮染料与主链上N,N-二甲基-2-羟丙烯氯化铵聚合阳离子的结合特性

Acta Polymerica Pub Date : 1999-07-20 DOI: 10.1002/(SICI)1521-4044(19990701)50:7<260::AID-APOL260>3.0.CO;2-9

S. Dragan, L. Ghimici, M. Cristea, A. Airinei

引用次数: 20

Phenomenological treatment of dynamic glass transition heterogeneity 动态玻璃化转变非均匀性的现象学处理

Acta Polymerica Pub Date : 1999-07-20 DOI: 10.1002/(SICI)1521-4044(19990701)50:7<240::AID-APOL240>3.0.CO;2-H

E. Donth

引用次数: 23

Reserse atom transfer radical polymerization of styrene using BPO as the initiator under heterogeneous conditions 非均相条件下以BPO为引发剂的苯乙烯储备原子转移自由基聚合反应

Acta Polymerica Pub Date : 1999-07-20 DOI: 10.1002/(SICI)1521-4044(19990701)50:7<267::AID-APOL267>3.0.CO;2-I

Shenmin Zhu, Wenxin Wang, Wenping Tu, Deyue Yan

引用次数: 17

New conducting carrier materials: polyalkylthiophene functionalized with 1,2-diol group and its protected forms 新型导电载体材料:1,2-二醇基功能化聚烷基噻吩及其保护形式

Acta Polymerica Pub Date : 1999-07-20 DOI: 10.1002/(SICI)1521-4044(19990701)50:7<252::AID-APOL252>3.0.CO;2-5

G. Li, G. Koßmehl, W. Kautek, W. Plieth, J. Melscheimer, K. Doblhofer, H. Zhu

{"title":"New conducting carrier materials: polyalkylthiophene functionalized with 1,2-diol group and its protected forms","authors":"G. Li, G. Koßmehl, W. Kautek, W. Plieth, J. Melscheimer, K. Doblhofer, H. Zhu","doi":"10.1002/(SICI)1521-4044(19990701)50:7<252::AID-APOL252>3.0.CO;2-5","DOIUrl":"10.1002/(SICI)1521-4044(19990701)50:7<252::AID-APOL252>3.0.CO;2-5","url":null,"abstract":"The syntheses and electropolymerization of 3-alkylthiophene functionalized with terminal 1,2-diol group as well as its protected forms were described. It was found that, in spite of the nucleophilic nature of diol function, the thiophene derivative bearing free dihydroxy group exhibits a rather good polymerizability in nitrobenzene and can be electropolymerized to form a stable conducting polymer film with more extended π-electron system than those from its protected forms. Using a two-probe method, the conductivity measurements on oxidized films of the obtained polymers give values in the range of 10–3–10–2 S cm–1. The reactivity of the pendant diol groups of the resulting polymers to attach biomolecules was examined by using redox active 2-aminoethylferrocenylmethylether as a model compound. It was confirmed that by using the well-established two-step procedure developed for the immobilization of proteins to polysaccharides, (primary) amino compounds can be easily bound onto the new polymers without the loss of their electroactivity. Therefore, as the most used functional group for the covalent immobilization of enzymes, vicinal dihydroxy group was incorporated into conjugated polymer systems and a new type of conducting carrier materials developed.","PeriodicalId":7162,"journal":{"name":"Acta Polymerica","volume":"50 7","pages":"252-259"},"PeriodicalIF":0.0,"publicationDate":"1999-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73203932","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: 3