Macromol. Chem. Phys. 1/2012

Huang, Tianzi; Wang, Xiaojun; Malmgren, Thomas; Hong, Kunlun; Mays, Jimmy W.

doi:10.1002/macp.201290003

Cited by 6 publications

(7 citation statements)

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“…The host U channels in polymer-U-ICs are of intermediate diameters. [1][2][3][4][5][6][7] In the crystallijne ICs formed with CD and U hosts, the included guest chains are stretched to high extension and are isolated from each other. Guest polymer chains coalesced from the crystalline host CD or U lattices, that is, c-polymers, retain a significant degree of their prior included extended and unentangled nature.…”

Section: Introductionmentioning

confidence: 99%

“…F I G U R E 1 Space-filling drawing of a channel in the urea-nhexadecane-IC, with publisher permission [4] F I G U R E 2 A, γ-CD chemical structure and, approximate dimensions of α-, β-, and γ-CDs; schematic representation of packing structures of, B, cage-type, C, layertype, and, D, head-to-tail channel type CD crystals; and E, CD-IC channels containing included polymer guests, with publisher permission [5] 2 | EXPERIMENTAL The materials used and the methods employed to observe them are fully described in refs. [1][2][3][5][6][7][8] and in the subsequent references cited below.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the melt crystallization of polymers, especially slow crystallizing polymers like PLLA and PET

Tonelli

2020

Polymer Crystallization

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Over 20 years ago we demonstrated that it is possible to control the melt crystallization of polymers via self‐nucleation. Non‐covalently bonded inclusion compounds (ICs) can be formed with cyclodextrins (CDs) or urea (U) when these small host molecules crystallize around guest polymers and form narrow parallel host channels, where the isolated and stretched guest polymer chains are included. Careful removal of the host crystalline lattice yields a neat coalesced (c) guest polymer sample with less entangled chains that are packed to a higher density than bulk samples of the same polymer obtained from its melt or solutions. Consequently, the reorganized c‐polymer samples behave distinctly, with higher glass‐transition temperatures for amorphous polymers and enhanced crystallizabilities for semi‐crystalline polymers. Remarkably, c‐polymer samples retain their distinct reorganized structures and behaviors even after extended periods of melt annealing. When a small amount of the rapidly crystallizable c‐polymer is homogeneously dispersed in a large quantity of the same as‐received (asr) polymer, and it is melted and then cooled, the c‐polymer chains crystallize first and nucleate the crystallization of the asr‐polymer chains, so that the entire sample (nuc‐polymer) crystallizes at nearly the same temperature as the neat nucleant (c‐polymer), including slow melt‐crystallizing polymers, such as PET and PLLA.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing the melt crystallization of polymers, especially slow crystallizing polymers like PLLA and PET

Tonelli

2020

Polymer Crystallization

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“…Either the β -CD unit is threaded onto the backbone of the PNIPAM or the amide side group of a monomer unit is dipped into the β -CD cavity (Scheme 1 c). Threading of β -CD units on polymeric chains is known for a variety of polymers [ 16 ] Scheme 1. Sketch of the synthetic pathway leading to thermoresponsive stable polystyrene clusters via redox-initiated aqueous heterophase polymerization (not to scale); a) β -cyclodextrin; b) β -CD-PNIPAM precursor network; c) amide side chain of PNIPAM dipped in β -CD; d) β -CD-PNIPAM-polystyrene cluster.…”

Section: Characterizationmentioning

confidence: 99%

Stabile, Thermoresponsive Colloidal Clusters: An Unusual Morphology of Polymer Dispersions

Hartmann

Tauer

2013

Macromol. Rapid Commun

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A new class of colloidal polymeric particles consisting of polystyrene spheres grown in a poly(N-isopropyl acrylamide) precursor scaffold is synthesized via redox-initiated heterophase polymerization. The morphology and thermoresponsiveness of these assemblies is proven by electron microscopy investigations and temperature-dependent measurements of the change of both the speed of sound travelling through the dispersion and the hydrodynamic particle size. Electron microscopy (EM) micrographs (transmission and scanning EM as well cryo-scanning EM) prove the existence of colloidal clusters when the freeze-dried copolymer is redispersed in pure water. The clusters have a size of several micrometers, contain about 800 polystyrene particles with diameter below 100 nm, and show a highly reproducible thermoresponsive behavior with a lower critical solution temperature corresponding to that of pure poly(N-isopropyl acrylamide).

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“…The linearly PNVCL‐based block copolymers have gained much impetus in recent years due to the enhanced boost of the so‐called controlled free radical polymerization methods, such as atom transfer free radical polymerization (ATRP), reversible addition fragmentation chain transfer (RAFT) polymerization, or organometallic‐mediated radical polymerization . However, only six recent articles were concerned on nonlinear block copolymers containing the PNVCL moiety .…”

Section: Introductionmentioning

confidence: 99%

Dendritic poly(benzyl ether)‐b‐poly(N‐vinylcaprolactam) block copolymers: Self‐organization in aqueous media, thermoresponsiveness and biocompatibility

Tang

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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Four generations of new amphiphilic thermoresponsive linear‐dendritic block copolymers (LDBCs) with a linear poly(N‐vinylcaprolactam) (PNVCL) block and a dendritic poly(benzyl ether) block are synthesized by atom transfer radical polymerization (ATRP) of N‐vinylcaprolactam (NVCL) using dendritic poly(benzyl ether) chlorides as initiators. The copolymers have been characterized by 1H NMR, FTIR, and GPC showing controlled molecular weight and narrow molecular weight distribution (PDI ≤ 1.25). Their self‐organization in aqueous media and thermoresponsive property are highly dependent on the generation of dendritic poly(benzyl ether) block. It is observed for the LDBCs that the self‐assembled morphology changes from irregularly spherical micelles, vesicles, rod‐like large compound vesicles (LCVs), to the coexistence of spherical micelles and rod‐like LCVs, as the generation of the dendritic poly(benzyl ether) increases. The results of a cytotoxicity study using an MTT assay method with L929 cells show that the LDBCs are biocompatible. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 300–308

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Macromol. Chem. Phys. 1/2012

Cited by 6 publications

References 0 publications

Enhancing the melt crystallization of polymers, especially slow crystallizing polymers like PLLA and PET

Enhancing the melt crystallization of polymers, especially slow crystallizing polymers like PLLA and PET

Stabile, Thermoresponsive Colloidal Clusters: An Unusual Morphology of Polymer Dispersions

Dendritic poly(benzyl ether)‐b‐poly(N‐vinylcaprolactam) block copolymers: Self‐organization in aqueous media, thermoresponsiveness and biocompatibility

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