Influence of polymerization procedure on polymer topology and other structural properties in highly branched polymers obtained by A2+B3 approach

Oguz, Cihan; Gallivan, Martha A.; Cakir, Seda; Yılgör, Emel; Yilgör, Iskender

doi:10.1016/j.polymer.2008.01.022

Cited by 13 publications

(12 citation statements)

References 38 publications

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“…However, traditional acrylate oligomers are commonly linear molecules containing two double bonds; their viscosity is usually higher, and this causes difficulties in use, so reactive diluents must be used 5–7. Highly crosslinked polymers have attracted increasing attention for UV coating and adhesive applications because of the special molecular structures, such as the large number of end groups, compact molecular shape, and reduced chain entanglement 8–10. The physical and chemical properties of highly crosslinked polymers are rather different from those of their conventional linear counterparts.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of poly(urethane acrylate) films for ultraviolet‐curable coatings

Seo

Jang

Song

et al. 2010

J of Applied Polymer Sci

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Four different UV-curable poly(urethane acrylate)s were prepared through the reaction of two diisocyanates [i.e., toluene-2,4-diisocyanate (TDI) and isophorone diisocyanate (IPDI)] and two polyols [i.e., polycaprolactone triol (PCLT) and polycaprolactone diol (PCLD)], and they were characterized with Fourier transform infrared spectroscopy. The mechanical properties, thermal properties, and water sorption of the cured poly (urethane acrylate)s were also investigated with respect to the chemical structures of the polyols and diisocyanates. In comparison with linear PCLD-TDI and PCLD-IPDI, crosslinked PCLT-TDI and PCLT-IPDI with trifunctional PCLT showed relatively high thermal decomposition temperatures. The hardness and modulus of the UV-cured poly(urethane acrylate) films, which were measured by a nanoindentation technique, were in the following increasing order: PCLD-IPDI $ PCLD-TDI < PCLT-IPDI $ PCLT-TDI. The pencil hardness was 3H for PCLT-IPDI and PCLT-TDI and HB for PCLD-IPDI and PCLD-TDI. Two urethane acrylates prepared from the trifunctional polyol showed better acid and alkali resistances than those made from the bifunctional polyol. These mechanical properties and chemical resistances may have been strongly dependent on the chain flexibility of the molecules and crosslinking density. Regardless of the functionality in the polyol, the change in the yellowness index showed a lower value in the poly(urethane acrylate) coating containing the aliphatic diisocyanate IPDI in comparison with the corresponding poly(urethane acrylate) with the aromatic diisocyanate TDI.

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Section: Introductionmentioning

confidence: 99%

Preparation and properties of poly(urethane acrylate) films for ultraviolet‐curable coatings

Seo

Jang

Song

et al. 2010

J of Applied Polymer Sci

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“…In their report, they also study the influence of the concentration of the comonomer on the hyperbranched topology and propose ac oncept of ac ritical gelationc oncentration. [6a, 23] In their report,O guz et al [24] study the effect of controlling the feed sequence on the hyperbranched topology,i ncludingt he addition of A 2 to B 3 ,t he addition of B 3 to A 2 ,a nd the mixture of A 2 and B 3 .N otably,i ft he n value is over 3i nt he A 2 + B ntype DMM, gelation is more likelyt oo ccur,a nd this results in restricted controlo ft he hyperbranched topology.E vens o, A 2 + B 4 -type DMM has also received considerable interest for the construction of the hyperbranched topology. Xu et al [25] describe the synthesis of A 2 + B 4 -type hyperbranched poly(bamino ester)st hrough Michael addition of A 2 monomer M7 and B 4 monomer M13 (Table2).…”

Section: Dmm-basedtopologyconstructionmentioning

confidence: 96%

Section: Hyperbranched Topology Constructionmentioning

confidence: 99%

Hyperbranched Polymers with Controllable Topologies for Drug Delivery

Ban

Sun

Kong

et al. 2018

Chemistry An Asian Journal

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Hyperbranched polymers (HPs) have widely been used for drug delivery owing to their highly branched topology, which endows the HPs with a large amount of intramolecular cavities for drug encapsulation and terminal groups for drug conjugation. Additionally, one-pot, large-scale preparations enable the easy fabrication of HPs for biomedical applications. This review provides an overview of the synthesis of HPs and their application for drug delivery. First, we introduce a diversity of methods for the synthesis of HPs with controllable topologies. Subsequently, we discuss drug encapsulation and drug conjugation by using HPs. Finally, we highlight the use of HPs with controllable topologies for promising drug delivery.

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“…And also, EHFHPSi serves as both effective diluent and cross‐linking agent, simplifying the preparation process. It was synthesized by A 2 + B 3 [8, 9] approach and end‐capped by HMDS, which has obvious advantages such as the wide commercial availability of bi‐ and tri‐functional monomers [10–14], and the effective controllability of the structure and properties of the resultant hyperbranched polymers [15, 16]. EHFHPSi possesses both peripheral and interior Si‐H groups, increasing the cross‐linking points and thus integrated property of the resultant resins [17].…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of addition curable silicone resins with excellent dielectric properties and thermal resistance

Zhang

Zhuo

et al. 2011

Polymer Engineering & Sci

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A new addition curable silicone resin (ASiR) system with excellent dielectric and thermal properties was developed, which consists of only two components: poly(methylphenylvinylsiloxane) (PMPVSi) and an end‐capped hydrogen‐functionalized hyperbranched polysiloxane (EHFHPSi). PMPVSi is synthesized by a green and controllable process; EHFHPSi is first synthesized via A2 + B3 approach, and then end‐capped by hexamethyldisiloxane (HMDS). Three formulations were designed to investigate the optimum stoichiometry. Results show that cured ASiR resins have greatly different dielectric and thermal properties because of the different chemical structure of cured networks resulting from the different stoichiometries. The resin with a suitable stoichiometry has not only excellent dielectric properties including extremely low dielectric constant (2.96 at 1 Hz) and loss (0.0003 at 1 Hz) as well as good stability on frequency, but also outstanding thermal resistance, exhibiting great potential to be used as a new kind of high‐performance resins for many cutting‐edge industries, especially the microelectronic and insulation fields. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers

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Influence of polymerization procedure on polymer topology and other structural properties in highly branched polymers obtained by A2+B3 approach

Cited by 13 publications

References 38 publications

Preparation and properties of poly(urethane acrylate) films for ultraviolet‐curable coatings

Preparation and properties of poly(urethane acrylate) films for ultraviolet‐curable coatings

Hyperbranched Polymers with Controllable Topologies for Drug Delivery

Preparation and properties of addition curable silicone resins with excellent dielectric properties and thermal resistance

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