Enhanced Fluorescence of Macrocyclic Polystyrene

Gan, Yaodong; Dong, Dahai; Carlotti, and Stephane; Hogen‐Esch, Thieo E.

doi:10.1021/ja9929638

Cited by 63 publications

(101 citation statements)

References 39 publications

(38 reference statements)

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“…Regardless, if synthetic procedures are described in detail or not, numerous publications report on solution properties of cyclic homopolymers frequently including a comparison with their linear counterparts (precursors) having the same molar masses. 10,11,51,52,55,58,60,73,95,[249][250][251][252][253][254][255][256][257][258][259][260][261][262][263][264][265] It was found in agreement with theoretical considerations that the hydrodynamic volume of the cyclic polymers is smaller (or the coil density higher) than that of the corresponding linear polymers. Therefore, solution viscosities of cyclic polymers are lower and their elution volumes or elution times in SEC measurements are higher than those of their linear analogues.…”

Section: Solution Propertiessupporting

confidence: 65%

“…252 According to theoretical expectations, the ratios of the mean square radius of gyration, hR g i Furthermore, fluorescence emission spectra of cyclic and linear PS were reported. 55,57,256 The intensities of the emission bands at 280 and 334 nm were evaluated. For linear PS, these intensities were independent on the concentrations for solutions containing 2 Â 10 À3 mol/L of repeat units and the intensities were independent on the chain length.…”

Section: Solution Propertiesmentioning

confidence: 99%

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Cyclic polymers: Synthetic strategies and physical properties

Kricheldorf

2009

J. Polym. Sci. A Polym. Chem.

397

442

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Syntheses of cyclic polymers including cyclic homopolymers, cyclic block copolymers, sun-shaped polymers, and tadpole polymers are discussed on the basis of a differentiation between synthetic methods and synthetic strategies (e.g., polycondensation, ring-ring equilibration, or ring-expansion polymerization). Furthermore, all synthetic methods are classified as kinetically or thermodynamically controlled reactions. Characteristic properties of cyclic polymers such as smaller hydrodynamic volume, lower melt viscosities, and higher thermostabilities are compared to the properties of their linear counterparts. Furthermore, the nanophase separation of cyclic diblock copolymers is discussed.

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Section: Solution Propertiessupporting

confidence: 65%

Section: Solution Propertiesmentioning

confidence: 99%

Cyclic polymers: Synthetic strategies and physical properties

Kricheldorf

2009

J. Polym. Sci. A Polym. Chem.

397

442

View full text Add to dashboard Cite

show abstract

“…There have been a few studies of the ultraviolet-visible (UV-vis) spectroscopic properties of these interesting polymers. [11][12][13][33][34][35][36][37][38] A brief study of the mechanical properties of a cyclic PS sample has appeared, 25 but a comprehensive study of the effect of the molecular weight (MW) on their physical properties is still lacking. This is due in part to difficulties in synthesizing narrow molecular weight distribution (MWD) and pure macrocycles in experimentally convenient quantities.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of macrocyclic vinyl aromatic polymers

Hogen‐Esch

2006

J. Polym. Sci. A Polym. Chem.

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The synthesis and characterization by size exclusion chromatography, liquid chromatography, NMR, matrix‐assisted laser desorption/ionization, thermal analysis, and other techniques of well‐defined and narrow molecular weight distribution macrocyclic polystyrene (PS), poly(2‐vinylpyridine), poly(α‐methylstyrene), poly (2‐vinyl‐naphthalene) (P2VN), and poly(9,9‐dimethyl‐2‐vinylfluorene) (PDMVF) containing a single 1,4‐benzylidene, methylidene, or 9,10‐anthracenylidene unit are reviewed. The absorption and emission spectroscopy of PS, P2VN, and PDMVF is also discussed. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2139–2155, 2006

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“…Much attention was paid to cyclic polymers and much effort was devoted to their design and synthesis for the last decades because of distinct properties compared to the linear counterparts, such as glass transition temperature, order-disorder transition, hydrodynamic volume, intrinsic viscosity, and enhancement of fluorescence [1][2][3][4]. This interest is motivated by the appealing topology of the macrocycles, the stringent restrictions on the backbone conformation, and the absence of chain ends.…”

Section: Introductionmentioning

confidence: 99%

A novel strategy towards cyclic aliphatic (co)polyesters

Gao¹,

Li²,

Chi³

et al. 2013

Express Polym. Lett.

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Abstract. This feature article focuses on a novel strategy towards macrocyclic (co)polyesters that combines controlled ring-opening polymerization of lactones initiated by a cyclic tin(IV) dialkoxide and intramolecular cyclization by photocross-linking of pendant unsaturations next to the propagating sites. No linear species is ever involved in the polymerization and permanent cyclization steps, which allows higher molecular weight macrocycles to be prepared with high efficiency and no need for further purification. Moreover, this synthetic route is very flexible to the point where macrocyclic polyesters with more complex although well-defined architectures, such as tadpole-shaped and sun-shaped copolyesters, can be tailored. Synthesis of well-defined eight-shaped polyesters and twin tadpole-shaped copolymers has also been explored by using a spirocyclic tin(IV) alkoxides as an initiator. When functional lactones were introduced, the 'click' copper-mediated cycloaddition [3+2] reaction was utilized to make the eight-shaped and twin tadpole-shaped copolyesters amphiphilic.

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Enhanced Fluorescence of Macrocyclic Polystyrene

Cited by 63 publications

References 39 publications

Cyclic polymers: Synthetic strategies and physical properties

Cyclic polymers: Synthetic strategies and physical properties

Synthesis and characterization of macrocyclic vinyl aromatic polymers

A novel strategy towards cyclic aliphatic (co)polyesters

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