Polymers of carbonic acid. XVII. Polymerization of cyclobis(tetramethylene carbonate) by means of BuSnCl3 and Sn(II) 2-ethylhexanoate

Kricheldorf, Hans R.; Mahler, Andreas

doi:10.1002/(sici)1099-0518(19960915)34:12<2399::aid-pola14>3.0.co;2-3

Cited by 44 publications

(47 citation statements)

References 16 publications

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“…The driving force is based on a gain in entropy resulting from broadening of the molecular weight distribution and from a gain in segmental mobility. Numerous research groups studied ROPs of aliphatic cyclic oligocarbonates, [189][190][191][192] aromatic cyclic oligocarbonates, [193][194][195] aromatic cyclic oligoesters, 129,[199][200][201][202] aromatic cyclic oligoethers, 203,204 cyclic oligoaramides, 205 and cyclic arylene disulfides. 206 Most of these ROPs were summarized in recent review articles.…”

Section: Ring-ring Equilibrationmentioning

confidence: 99%

Cyclic polymers: Synthetic strategies and physical properties

Kricheldorf

2009

J. Polym. Sci. A Polym. Chem.

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401

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: Ring-ring Equilibrationmentioning

confidence: 99%

Cyclic polymers: Synthetic strategies and physical properties

Kricheldorf

2009

J. Polym. Sci. A Polym. Chem.

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401

442

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“…Due to the safety and high catalytic efficiency, Sn(Oct) 2 is the most intensively used catalyst for the ROP preparation of aliphatic polyesters and polycarbonates. [35] We have previously reported the synthesis and polymerization of amine-containing (ADMC) 2 monomer. [27] The polymerization could be achieved under the catalysis of novozym-435 lipase, whereas the attempt by Sn(Oct) 2 catalysis failed owing to amine presence.…”

Section: Resultsmentioning

confidence: 99%

Acidity‐Promoted Cellular Uptake and Drug Release Mediated by Amine‐Functionalized Block Polycarbonates Prepared via One‐Shot Ring‐Opening Copolymerization

Wang

Jia

Chu

et al. 2013

Macromolecular Bioscience

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This paper reports a drug nanovehicle self-assembled from an amine-functionalized block copolymer poly(6,14-dimethyl-1,3,9,11-tetraoxa-6,14-diaza-cyclohexadecane-2,10-dione)-block-poly(1,3-dioxepan-2-one) (PADMC-b-PTeMC), which is prepared by controlable ring-opening block copolymerization attractively in a "one-shot feeding" pathway. The copolymers display high cell-biocompatibility with no apparent cytotoxicities detected in 293T and HeLa cells. Due to their amphiphilic nature, PADMC-b-PTeMC copolymers can self-assemble into nanosized micelles capable of loading anticancer drugs such as camptothecin (CPT) and doxorubicin (DOX). In particular, the outer PADMC shell endows the PADMC-b-PTeMC nanomicelles with pH-dependent control over the micellar morphology, cell uptake efficiency, and the drug release pattern. Confocal inspection reveals the remarkably enhanced cellular internalization of drug loaded micelles by cancerous HeLa cells at relatively lower pH 5.8 simulating the mildly acid microenvironment in tumors. Along with the acidity-triggered volume expansion of micelles, an accelerated CPT release in vitro occurs. The obtained results adumbrate the possibility of completely biodegradable PADMC-b-PTeMC as pH-sensitive drug carriers for tumor chemotherapy.

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“…The spectral analysis and melting point measurement of these crystals (m.p. 173-174°C) [35,36] revealed that during polycondensation, besides 1,4-butanediol, 14-membered cyclobis(tetramethylene carbonate) was formed as a by-product (Fig. 2).…”

Section: Synthesis Of Poly(tetramethylene Carbonate)mentioning

confidence: 99%

Aliphatic-aromatic poly(ester-carbonate)s obtained from simple carbonate esters, α,ω-aliphatic diols and dimethyl terephthalate

et al. 2015

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Two reaction pathways for synthesis of high molar mass (M w above 50 000 g/mol) aliphatic-aromatic poly(estercarbonate)s were elaborated. Simple organic carbonates such as dimethyl carbonate or propylene carbonate were used as carbonate linkage sources and dimethyl terephthalate as the precursor of ester linkages. 1,4-Butanediol, 1,5-pentanediol, 1,6-hexanediol and 1,10-decanediol were used as diol monomers. To adjust the carbonate units content in the copolymer, solid alkylene bis(methylcarbonate) was used as a semiproduct instead of volatile dimethyl carbonate. In case of usage propylene carbonate as a starting material the process can be carried out in one pot without the need for isolation of the semiproduct. The obtained copolymers based on 1,4-butanediol, containing ca. 50 mol.% of carbonate units exhibited better mechanical strength (37 MPa) than commercially available aliphatic-aromatic copolyester Ecoflex ® keeping the thermal properties at the same level.

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Polymers of carbonic acid. XVII. Polymerization of cyclobis(tetramethylene carbonate) by means of BuSnCl3 and Sn(II) 2-ethylhexanoate

Cited by 44 publications

References 16 publications

Cyclic polymers: Synthetic strategies and physical properties

Cyclic polymers: Synthetic strategies and physical properties

Acidity‐Promoted Cellular Uptake and Drug Release Mediated by Amine‐Functionalized Block Polycarbonates Prepared via One‐Shot Ring‐Opening Copolymerization

Aliphatic-aromatic poly(ester-carbonate)s obtained from simple carbonate esters, α,ω-aliphatic diols and dimethyl terephthalate

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