Synthesis of Photo-curable Hyperbranched Polycarbonates with Terminal Methacryloyl Groups and their Photo-curing Reaction

Maruyama, Ken; Takazoe, Taichi; Kudo, Hiroto; Nishikubo, Tadatomi

doi:10.1295/koron.66.36

Cited by 2 publications

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References 13 publications

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“…We recently developed an A 2 +B 3 polymerization method for the synthesis of HBPC that uses the reaction between Bisphenol-A-bis(chloroformate) and 1,1,1-tris(4-hydroxyphenyl)ethane (THPE). 21 This HBPC showed a lower birefringence change than the corresponding linear PC under a 1% drawn condition (T Nishikubo et al, unpublished data).…”

Section: Introductionmentioning

confidence: 94%

Synthesis of hyperbranched polycarbonate by novel polymerization of di-tert-butyl tricarbonate with 1,1,1-tris(4-hydroxyphenyl)ethane

Miyasaka

Takazoe

Kudo

et al. 2010

Polym J

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Hyperbranched polycarbonates (HBPCs) with M n ¼2.1-7.1Â10 3 were synthesized by A 2 +B 3 polymerization using di-tert-butyl tricarbonate as the A 2 monomer and 1,1,1-tris(4-hydroxyphenyl)ethane as the B 3 monomer. A 2 +B 3 polymerization with different feed ratios was achieved, controlling the degree of branching (DB) and the ratio of terminal functional groups. The DB of the HBPCs is 0.5-0.7. The Boc-terminated PC was prepared by either a 1-pot or a 2-pot synthesis. In contrast, PC with terminal phenol groups was prepared by deprotection of Boc-terminated PC.

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Section: Introductionmentioning

confidence: 94%

Synthesis of hyperbranched polycarbonate by novel polymerization of di-tert-butyl tricarbonate with 1,1,1-tris(4-hydroxyphenyl)ethane

Miyasaka

Takazoe

Kudo

et al. 2010

Polym J

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Aliphatic Hyperbranched Polycarbonates: Synthesis, Characterization, and Solubility in Supercritical Carbon Dioxide

et al. 2012

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Recently much effort has been devoted to developing drug delivery systems based on macromolecules of three-dimensional structure. In addition to dendrimers which are widely studied, hyperbranched polymers are gaining more and more attention. Among numerous polymeric materials used in drug delivery systems, aliphatic polycarbonates are one of the most interesting ones due to biocompatibility, nontoxic degradation products, and the absence of autocatalytic effect during the degradation process. However, they show poor solubility in supercritical carbon dioxide. This paper describes the synthesis of 5-(4-hydroxybutyl)-1,3-dioxan-2-one and its application for preparation of hyperbranched aliphatic polycarbonates. Linear analogues of the poly(5-(4-hydroxybutyl)-1,3dioxan-2-one) were prepared, too, and the structures were compared by means of 13 C NMR. Ring-opening polymerization of 5-(4-hydroxybutyl)-1,3-dioxan-2-one led to polymers containing solely primary hydroxyl groups which were subsequently reacted with trifluoroacetic anhydride. The phase behavior of fluorinated polymer in supercritical carbon dioxide was explored as a function of concentration and temperature. Modified hyperbranched polycarbonate showed reasonably good solubility in carbon dioxide. It was shown that hyperbranched structure of a polymer facilitate solubility even though the carbonate structural units do not promote solubility in scCO 2 .

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Synthesis of Photo-curable Hyperbranched Polycarbonates with Terminal Methacryloyl Groups and their Photo-curing Reaction

Cited by 2 publications

References 13 publications

Synthesis of hyperbranched polycarbonate by novel polymerization of di-tert-butyl tricarbonate with 1,1,1-tris(4-hydroxyphenyl)ethane

Synthesis of hyperbranched polycarbonate by novel polymerization of di-tert-butyl tricarbonate with 1,1,1-tris(4-hydroxyphenyl)ethane

Aliphatic Hyperbranched Polycarbonates: Synthesis, Characterization, and Solubility in Supercritical Carbon Dioxide

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