Light scattering and microcalorimetry studies on aqueous solutions of thermo-responsive PVCL-g-PEO copolymers

Verbrugghe, Sam; Laukkanen, Antti; Aseyev, Vladimir; Tenhu, Heikki; Winnik, Françoise M.; Prez, Filip Du

doi:10.1016/j.polymer.2003.07.003

Cited by 49 publications

(30 citation statements)

References 25 publications

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“…6). Similar asymmetric endotherms have been reported in a study of PVCL homopolymers with varying molecular weights [19] as well as for PVCL grafted with PEO [36]. Introduction of amphiphilic grafts onto PVCL increases the onset temperature of the endothermic transition compared to the nonmodified PVCL.…”

Section: Thermodynamics Of the Phase Transitionsupporting

confidence: 83%

Thermosensitive graft copolymers of an amphiphilic macromonomer and N-vinylcaprolactam: synthesis and solution properties in dilute aqueous solutions below and above the LCST

Laukkanen

Valtola

Winnik

et al. 2005

Polymer

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Section: Thermodynamics Of the Phase Transitionsupporting

confidence: 83%

Thermosensitive graft copolymers of an amphiphilic macromonomer and N-vinylcaprolactam: synthesis and solution properties in dilute aqueous solutions below and above the LCST

Laukkanen

Valtola

Winnik

et al. 2005

Polymer

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“…By increasing the hydrophilicity of the polymer, it has been found possible to enhance biocompatibility [17]. Hydrophilic PEO grafts also stabilize the PVCL particle at elevated temperatures [43].…”

Section: Discussionmentioning

confidence: 99%

Cytotoxicity of thermosensitive polymers poly(N-isopropylacrylamide), poly(N-vinylcaprolactam) and amphiphilically modified poly(N-vinylcaprolactam)

et al. 2005

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“…Therefore the first peak corresponding to small particles may be due either to single multiblock polycarbonate molecules or to small aggregates having just a few polymer chains, while the second distribution indicate the presence of aggregates resulting from intermolecular association. [51][52][53] It can be seen that the size of the larger population increased with the increasing concentration of the polycarbonate. Similar trends were observed for other polycarbonates.…”

Section: Surface Activitymentioning

confidence: 97%

Synthesis of biodegradable amphiphilic thermo‐responsive multiblock polycarbonate and its self‐aggregation behavior in aqueous solution

Wang

Tan

Huang

et al. 2009

J of Applied Polymer Sci

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Amphiphilic thermo-responsive multiblock polycarbonates consisting of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) were facilely synthesized using triphosgene as coupling agent. The structures and molecular characteristics of the polycarbonates were confirmed by 1 H-NMR, FT-IR and Gel permeation chromatography (GPC). The crystallization behavior and thermal properties of the polycarbonates were studied using X-ray diffraction (XRD), Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Surface tension measurements confirmed that the critical micelles concentration of polymeric micelles were concentration ranges, which varied from about 2-70 mg/L to 5-40 mg/L with increasing PEO/PPO composition ratio from 0.8 to 1. Dynamic light scattering (DLS) experiments showed bimodal size distributions, the aggregates size increased with increasing the concentration of the polycarbonates aqueous solutions. The size of the aggregates acquired from TEM was smaller than that from DLS owing to the fact that TEM gave size of the aggregates in dry state rather than the hydrodynamic diameter. The degradation process revealed that the degradation rate of the aggregates could be accelerated with an increase in temperature. Moreover, the more the polycarbonate was hydrophilic, the faster was its degradation. Rheological measurements suggested that these multiblock polycarbonates were thermo-responsive and by regulating the PEO/PPO composition ratio they could form a gel at 37 C.

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Light scattering and microcalorimetry studies on aqueous solutions of thermo-responsive PVCL-g-PEO copolymers

Cited by 49 publications

References 25 publications

Thermosensitive graft copolymers of an amphiphilic macromonomer and N-vinylcaprolactam: synthesis and solution properties in dilute aqueous solutions below and above the LCST

Thermosensitive graft copolymers of an amphiphilic macromonomer and N-vinylcaprolactam: synthesis and solution properties in dilute aqueous solutions below and above the LCST

Cytotoxicity of thermosensitive polymers poly(N-isopropylacrylamide), poly(N-vinylcaprolactam) and amphiphilically modified poly(N-vinylcaprolactam)

Synthesis of biodegradable amphiphilic thermo‐responsive multiblock polycarbonate and its self‐aggregation behavior in aqueous solution

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