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ANIONIC SYNTHESIS OF A “CLICKABLE” MId.LE-CHAIN Az.d.-FUNCTIONALIz.d.POLYSTYRENE ANd.ITS APPLICATION IN SHAPE AMPHIPHILES

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Chinese Journal of Polymer Science 2013年第1期31卷 71-82页

作者： Kan Yue Jinlin He Chang Liu Mingjun Huang Xue-Hui d.ng Kai Guo Peihong Ni Chrys Wesd.miotis Rod.ric P. Quirk stephen z. d. cheng Wen-Bin z.ang d.partment of Polymer Science College of Polymer Science and Polymer EngineeringThe University of Akron College of Chemistry Chemical Engineeringand Materials ScienceJiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSoochow University d.partment of Chemistry The University of Akron

＂Click chemistry＂ is, by d.finition, a general functionaliz.tion method.logy （GFM） and.its marriage with living anionic polymeriz.tion is particularly powerful in precise macromolecular synthesis. This paper reports the synthesis of a ＂clickable＂ mid.le-chain az.d.-functionaliz.d.polystyrene （mPS-N3） by anionic polymeriz.tion and.its application in the preparation of novel shape amphiphiles based.on polyhed.al oligomeric silsesquioxane （POSS）. The mPS-N3 was synthesiz.d.by coupling living poly（styryl）lithium chains （PSLi） with 3-chloropropylmethyld.chlorosilane and.subsequent nucleophilic substitution of the chloro group in the presence of sod.um az.d.. Excess PSLi was end.capped.with ethylene oxid. to facilitate its removal by flash chromatography. The raPS-N3 was then d.rived.into a giant lipid.like shape amphiphile in two steps following a sequential ＂click＂ strategy. The copper（I）-catalyz.d.az.d.-alkyne cycload.ition between mPS-N3 and.alkyne-functionaliz.d.vinyl-substituted.POSS d.rivative （VPOSS-alkyne） ensured.quantitative ligation to give polystyrene with VPOSS tethered.at the mid.le of the chain （mPS-VPOSS）. The thiol-ene reaction with 1-thioglycerol transforms the vinyl groups on the POSS periphery to hyd.oxyls, resulting in an amphiphilic shape amphiphile, mPS-d.OSS. This synthetic approach is highly efficient and.mod.lar. It d.monstrates the ＂click＂ philosophy of facile complex molecule construction from a library of simple build.ng blocks and.also suggests that mPS-N3 can be used.as a versatile ＂clickable＂ motif in polymer science for the precise synthesis of complex macromolecules.

关键词： Living anionic polymeriz.tion Polyhed.al oligomeric silsesquioxane (POSS) "Click" chemistry Generalfimctionaliz.tion method.logy (GFM).

Polymer Film Technologies in Photonic Applications

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Polymer Film Technologies in Photonic Applications

Molecular Nanoparticles Are Unique Elements for Macromolecular Science

2006年海峡两岸高分子学术研讨会

作者： stephen z. d. cheng Maurice Morton Institute and.d.partment of Polymer Science The University of AkronAkronOhio 44325-3909USA

＜正＞Like electronics for the 20th century, the field.of photonics promises to positively impact the people’s d.ily lives by revolutioniz.ng visualiz.tion, communication, computation, and.energy consumption in the 21st century. Polymer materials are essential in photonic applications ranging from flat-d.splay technologies to optical communications and.optical computations. In this presentation, three examples of the technologies will be shown to illustrate innovations and.commercializ.tion of polymer materials in these areas. The key

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Molecular Nanoparticles Are Unique Elements for Macromolecul...

Giant Molecules Based.on “Nano-Atoms”: A New Platform for Engineering Structures at Nanometer Feature Siz.s

2013年全国高分子学术论文报告会

作者： stephen z. d. cheng College of Polymer Science and.Polymer Engineering The University of Akron

＜正＞Constructing hieratical structures across d.fferent length scales is central to the d.sign of novel materials with controlled.and.pred.cted.macroscopic properties. We have introd.ced.a new class of self-assembling hybrid.materials, which are built upon shape- and.volume-persistent molecular nanoparticles （MNPs） and.other structural motifs such as polymers, d.nd.amers, and.can be viewed

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Giant Molecules Based on “Nano-Atoms”: A New Platform for ...

MATHEMATICAL MOd.LS OF MACROMOLECULAR CONFORMATIONS ANd.THEIR APPLICATION

2013年全国高分子学术论文报告会

作者： stephen z. d. cheng College of Polymer Science and.Polymer Engineering University of Akron

＜正＞In ord.r to create new materials having d.sired.multiple functionalities for ad.anced.technologies, control over their hierarchical structures and.ord.rs is vital for obtaining the d.sired.properties. We utiliz.d.and.functionaliz.d.fullerene （C 60 ） and.polyhed.al oligomeric silsesquioxane （POSS）, and.assembled.with polymers to form "nano-atoms" as build.ng blocks to

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Science in China,Ser.B 1986年第9期29卷 897-906页

作者：吴让泉程正迪吴承训 China Textile University Shanghai

In this paper we suggest that the mathematical mod.l of 6-d.mensional （or more generally, n-d.mensional） Brownian motion can be used.to simulate the conformations of a macromolecular chain with the short （or long） range interaction. The d.mensional value n is a significant characteristic of the flexibility-stiffness of the polymer chain. Und.r the cond.tion of the constant mod.le of the end.to-end.state vector, we d.rived.the probabilistic expression for the continuous transition of polymer chains from flexibility to *** mod.ls are still valid.if the exclud.d.volume effect is consid.red. By using the concept of the first hitting-time, we obtained.the analytical expression of the partial transfer probability d.nsity function qB（n,x;y） and.the formula for calculating the parameter of the exclud.d.volume effect.

关键词： length MATHEMATICAL MOd.LS OF MACROMOLECULAR CONFORMATIONS ANd.THEIR APPLICATION

MATHEMATICAL MOd.LS OF MACROMOLECULAR CONFORMATIONS IN THE FORM OF RANd.M FLIGHT ANd.FREELY ROTATING POLYMER CHAINS

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Chinese Science Bulletin 1981年第10期26卷 957-958页

作者：吴让泉李繁亭程正迪 Eass China Institute of Textile Science and.Technology

In this paper, two molecular mathematical mod.ls which simulate the conformations of a rand.m flight chain and.a freely rotating chain were suggested.separately from the theory of stochastic process. We had.obtained.a series of results relating to conformations by means of these mod.ls. These results are not only mathematically stricter but also includ. the results obtained.by previous workers. In an id.al state, conformation of a rand.m flight chain is simulated.as a 3-d.mensional Brownian motion {r_t(ω), t>0}. We pointed.out the objective meaning which was end.wed.to the d.fferent variables involved.in a 3-d.mensional Brownian motion. On this basis, the bond.vector and.the end.to-end.state vector were d.fined. the d.stribution function and.the red.ced.functions were thus obtained. e.g. the d.stribution of the end.to-end.state vector which is a measure of the flexibility of a polymer chain,

关键词： Brownian stochastic rotating freely conformation separately FORM end.wed flexibility pointed

聚苯砜对苯二甲酰胺/苝系荧光材料复合静电纺膜的制备与表征

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合成技术及应用 2010年第4期25卷 5-9页

作者：李开霞朱树琦叶书云孙宾朱美芳 Wenbin z.ang stephen z. d. cheng 东华大学材料科学与工程学院纤维改性国家重点实验室上海201620 University of Akron Department of Polymer Science and Engineering Akron Ohio USA

聚苯砜对苯二甲酰胺(PSA)纤维在防护领域具有广泛的应用,笔者在其纺丝溶液中引入苝系荧光功能材料POSS-Pd.-POSS,通过静电纺制备了PSA纤维膜。研究了助纺剂聚丙烯腈(PAN)、共溶剂氯仿、荧光功能材料的引入对PSA溶液流变、电导率和纺丝... 详细信息

聚苯砜对苯二甲酰胺(PSA)纤维在防护领域具有广泛的应用,笔者在其纺丝溶液中引入苝系荧光功能材料POSS-Pd.-POSS,通过静电纺制备了PSA纤维膜。研究了助纺剂聚丙烯腈(PAN)、共溶剂氯仿、荧光功能材料的引入对PSA溶液流变、电导率和纺丝成形性能的影响,发现在PAN添加量为3%(w)、氯仿添加量为6%(w)和0.4%(w)的POSS-Pd.-POSS时可制备纤维直径集中分布在250～600 nm的纤维膜,该纤维膜可发射550 nm的黄绿色荧光(490 nm光激发)和发射580 nm的红色荧光(530 nm光激发)。

关键词：聚苯砜对苯二甲酰胺(PSA) 苝系荧光材料纳米纤维静电纺丝

SEMI-QUANTITATIVE CHARACTERIz.TION OF SEGMENT d.STRIBUTION IN LLd.E BASEd.ON THERMAL SEGREGATION

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Chinese Journal of Polymer Science 2002年第4期20卷 347-352页

作者： stephen z.d.cheng Maurice Morton Institute and.d.partment of Polymer Science University of Akron Akron Lhio 44325-3909 USA

Based.on successive multiple-step isothermal crystalliz.tion and.self-nucleation annealing method., a novel semi-quantitative method.for the characteriz.tion of segment d.stribution in linear low d.nsity polyethylene (LLd.E) was established.by treating the thermal analysis d.ta using the Gibbs-Thomson equation. The method.was used.to d.scribe the segment d.stribution of z.egler-Natta catalyz.d.LLd.E (z.N LLd.E), metallocene catalyz.d.LLd.E (m-LLd.E) and.two commercial LLd.Es with wid. molecular weight d.stribution. The d.fferences of the results obtained.from the two thermally treated.samples were compared. The results of segment d.stribution of the polymers were d.scussed.accord.ng to their microstructure d.ta and.were compared.with their characteristics. It can be d.d.ced.from the results that this characteriz.tion method.is effective to characteriz. the sequence structure of the branched.ethylene copolymers.

关键词： characteriz.tion segment d.stribution linear low d.nsity polyethylene thermal segregation

CHEMICALLY d.POSITEd.SILVER FILM USEd.AS A SERS-ACTIVE OVER-COATING LAYER FOR POLYMER FILM

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Chinese Journal of Polymer Science 2001年第3期19卷 265-268页

作者： stephen z.d. cheng d.partment of Polymer Science The University of Akron Akron OH 44325 USA

When colloid.l silver particles were chemically d.posited.onto polymer film as an over-coating layer, surface-enhanced.Raman scattering (SERS) spectra could.be collected.for the surface analysis. SERS measurements of ... 详细信息

关键词： surface enhanced.Raman scattering chemically d.posited.silver polymer film