Synthesis and intrinsic blue fluorescence study of hyperbranched poly(ester-amide-ether)

Zhang, Yong; Fu, Qi; Shi, Wenfang

doi:10.1007/s11426-010-4154-1

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…Furthermore, HPUTZ showed a bimodal distribution of molecular weight, relating to the elution volumes of 32.5 and 33.8 mL. The similar behavior has been reported for hyperbranched poly-mers [23][24][25].…”

Section: Synthesis and Characterizationsupporting

confidence: 79%

Synthesis and shape memory behavior study of hyperbranched poly(urethane-tetrazole)

2011

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A novel hyperbranched poly(urethane-tetrazole) (HPUTZ) was synthesized via the "A 2 +BB 2 ′ " approach using hexadiisocyanate (HDI) and 3-(bis-(2-hydroxyethyl)) aminopropyltetrazole (HAPTZ). The molecular structure was characterized by FTIR and 1 H NMR spectroscopy. The number average molecular weight was measured to be 1.05×10 4 g/mol with a polydispersity of 1.27 by GPC analysis. The HPUTZ was further cured by the semi-adduct (PEG-IPDI) from polyethylene glycol (PEG) reacting with isophorone diisocyanate (IPDI) to form the crosslinked HAPTZ-PU film in different ratio of HAPTZ to PEG-IPDI. The glass transition temperature of HAPTZ-PU increased from 44.9 to 56.4 °C as the HPUTZ content increased from 20% to 33% from the DSC analysis. The DMA results indicated that the HPUTZ-PU with 20% HPUTZ possessed the highest storage modulus and loss tangent. However, the storage modulus increased with the increasing of HPUTZ segment at higher temperature. The shape memory study showed that all the films presented the excellent shape memory function. Over 98% shape recovery could be obtained for the HAPTZ-PU with 20%-33% HAPTZ segment content within 60 s in the tension deformation test and within 40 s at 80 °C in the bend deformation test. synthesis, hyperbranched poly(urethane-tetrazole), shape memory behavior, thermal property

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Section: Synthesis and Characterizationsupporting

confidence: 79%

Synthesis and shape memory behavior study of hyperbranched poly(urethane-tetrazole)

2011

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“…Based on the type of heteroatoms other than carbon and hydrogen atoms in the nonconventional chromophores, the NTLs can be roughly classified into following categories (Figure 1) 1) Oxygen-containing NTLs: alcohols (d-fructose, d-(+)-xylose, d-galactose, and pentaerythritol), [30] ethers [poly(ethylene glycol) (PEG), [31] and hyperbranched polyether epoxy (EHBPE)], [23] carboxylic acids [poly(acrylic acid) (PAAc)], [32] anhydrides [poly(itaconic anhydride) (PITA), [33] and poly(maleic anhydride)], [16,34] and esters [polycarbonate, [35] and poly(lactic acid) binary blends]. [36] 2) Nitrogen-containing NTLs: amines [poly(amido amine) (PAMAM), [37,38] hyperbranched poly(amino ester) (PAE), [39,40] and poly(amino ether ester)], [41] imines [linear or hyperbranched polyethyleneimine (PEI)], [42][43][44] oximes (hexanal oximes), [11] nitriles [polyacrylonitrile (PAN)], [17] amides [polyacrylamide (PAAm), [45] poly(N-isopropylacrylamide) (PNIPAM), [32] poly(ether amide) (PEA), [46] poly(esteramide-ether) (PEAE), [47] and poly(amido acids)], [48] imides (polysuccinimide), [20,22] polyurethane, [49,50] amino acids, [51,52] and lactams [polyvinylpyrrolidone (PVP), [53] and poly(Nvinylcaprolactam) (PNVCL)]. [54] 3) Sulfur-containing NTLs: thiols (cysteine), sulfones (polysulfone), [55] sulfonic acids [perfluorosulfonate ionomers (PFSI)], [10] sulfonates [poly(4-vinylpyridine)butane-1sulfonate (PVP-S)], [56] and thiourea.…”

Section: Diversity Of Ntlsmentioning

confidence: 99%

Nontraditional Organic/Polymeric Luminogens with Red‐Shifted Fluorescence Emissions

Deng

Jia

Xie

et al. 2022

Macro Chemistry & Physics

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Nontraditional organic/polymeric luminogens, which do not contain any conventional chromophores like large 𝝅-conjugated benzene rings and/or heterocycles, have attracted rapidly growing attention owing to their importance in the fundamental understanding of photoluminescence mechanisms and potential practical applications. However, compared to traditional luminogens, most nontraditional luminogens (NTLs) emit fluorescence in the blue region, and only very limited NTLs with green, yellow, and red emissions have been reported. It is of great scientific and practical importance to develop NTLs with red-shifted emissions and understand their mechanisms. This review first provides a brief overview of the types of NTLs based on heteroatoms in them, the luminescence mechanism and luminescent characteristics of NTLs, then summarizes recent progress in NTLs with red-shifted emissions and the main strategies employed, i.e., introducing multiple nonconventional chromophores, introducing intra-/intermolecular interactions to rigidify clusters, and introducing electron-giving/withdrawing groups into molecules to lower the gap between the HOMO-LUMO energy levels. This review also provides the perspectives and outlook on future development of NTLs with red-shifted emissions.

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“…Pan et al have successfully prepared hyperbranched poly(methyl methacrylate)s (HPMMAs) by atom transfer radical copolymerization (ATRP) of MMA and divinylbenzene (DVB) [28]. Shi et al have synthesized a series of hyperbranched poly(ester-amide-ether)s (H-PEAEs) via the A 2 -CB 3 approach by the self-transesterification of ethyl ester-amide-ethers end-capped with three hydroxyl groups and ethyl ester group at two terminals [29]. Gao's group have facilely synthesized spherical molecular brushes with amphiphilic heteroarms by grafting the arms of hydrophobic 2-azidoethyle palmitate and hydrophilic monoazide-terminated poly(ethylene glycol) onto the core of alkyne-modified hyperbranched polyglycerol (HPG) with high molecular weight (M n = 122 kDa) via one-pot parallel click chemistry [30].…”

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confidence: 99%

Focus on polymer chemistry papers in Science China Chemistry of the year 2010

2011

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The journal Science China Chemistry published 63 papers in polymer fields in 2010, leading to a percentage increase of 473% compared to the year 2008 and 70% to the year 2009, respectively (Figure 1). In this year, three polymer Special Topics were designed and published: Biomedical Polymer (Number 3) [1], Advances in Principles of Polymerization (Number 8) [2] and Highly Branched Polymers-Promising Architectural Macromolecules (Number 12) [3]. Several high qualified papers were published and great achievements have been obtained in the year 2010.The Special Topic of Biomedical Polymers was organized by Prof. GAO ChangYou and GU ZhongWei. According to these papers one knows that the applications of biomedical polymers are focusing on drug release [4-8] and gene delivery [9,10]. For the drug release system, a great number of materials can be utilized such as supermolecule, block copolymers, hyperbranched polymers, etc. Yan et al. synthesized a series of hyperbranched copolymers and explored their applications, especially in drug release [4,11,12].In their researches, two kinds of novel temperature-responsive hyperbranched multiarm copolymers were successfully synthesized via the atom transfer radical polymerization (ATRP). Poly(3-ethyl-3-(hydroxymethyl) oxetane) (HBPO) core and thermosensitive poly(N-isopropylacrylamide) (PNIPAM) arms were synthesized from NIPAM monomers by using a hyperbranched HBPO macroinitiator. Moreover, poly(L-lactide) (PLA) inner-shell and poly(ethylene glycol) (PEG) outer-shell with disulfide-linkages between the hydrophobic and hydrophilic moieties was developed as unimolecular micelles. The HBPO-star-PNIPAM self-assembled micelles showed much improved drug encapsulation efficiencies and temperature-dependent sustainable release behavior due to the special micellar structure. The micelles exhibited no apparent cytotoxicity against human HeLa cells. The H40-star-PLA-SS-PEG bioreducible unimolecular micelles were proved as promising carriers for the triggered intracellular delivery of hydrophobic anticancer drugs. Gu's review discussed peptide dendrimers synthesis and functionalization and their applications in biomedicine for drug release and gene delivery [13]. There are two main advantages of the peptide dendrimers, i.e. the size controllable synthesis even to nanometers and the good biocompatibility due to their similar properties as proteins. Therefore, the peptide dendrimers have received considerable attention in biomedicine. They also investigated a novel supramolecular nanoparticle, and studied the drug release behavior and the anti-tumor effects. The results demonstrate that the supramolecular nanoparticles are biocompatible and are promising carriers for drug delivery. Zhang et al. discussed several kinds of stimulus-responsive nanoparticles, including pH-responsive, temperature-responsive, lightresponsive, magnetic-responsive, ultrasound-responsive, pH/

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Synthesis and intrinsic blue fluorescence study of hyperbranched poly(ester-amide-ether)

Cited by 4 publications

References 30 publications

Synthesis and shape memory behavior study of hyperbranched poly(urethane-tetrazole)

Synthesis and shape memory behavior study of hyperbranched poly(urethane-tetrazole)

Nontraditional Organic/Polymeric Luminogens with Red‐Shifted Fluorescence Emissions

Focus on polymer chemistry papers in Science China Chemistry of the year 2010

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