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Your search keyword '"de Jongh, Patrick A. J. M."' showing total 9 results
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9 results on '"de Jongh, Patrick A. J. M."'

3. Thermal study on polyester networks based on the renewable monomers citric acid and gluconolactone

Author

de Jongh, Patrick A. J. M., Paul, Prem K. C., Khoshdel , Ezat, Wilson, Paul, Kempe, Kristian, and Haddleton, David M.

Subjects
TP
Abstract

A detailed thermal study is presented of the melt polycondensation between the renewable monomers citric acid and d-glucono-δ-lactone. It was found that the polyester networks formed have glass transition temperature ranges that increase with increasing reaction temperature and time, corresponding to an increase in molecular weight. The minimum reaction temperature was investigated and found to be 130 °C for a 1/1 system. Moreover, the monomers show eutectic melt behaviour, with a eutectic melting temperature of 125 °C. A range of additional co-monomers were evaluated, revealing that aliphatic and aromatic bifunctional co-monomers result in lower glass transition temperatures. When polyfunctional co-monomers were employed it was found that the chain flexibility influenced the resulting thermal properties. Moreover, it is shown that the ring structure of d-glucono-δ-lactone plays a key role in the thermal properties of the resulting polyesters. © 2016 Society of Chemical Industry\ud

Published
2017

9. Functional Brush Poly(2-ethyl-2-oxazine)s: Synthesis by CROP and RAFT, Thermoresponsiveness and Grafting onto Iron Oxide Nanoparticles.

Author

Klein T, Parkin J, de Jongh PAJM, Esser L, Sepehrizadeh T, Zheng G, De Veer M, Alt K, Hagemeyer CE, Haddleton DM, Davis TP, Thelakkat M, and Kempe K

Subjects
Cations, Colloids chemistry, Contrast Media chemical synthesis, Esters chemistry, Ferric Compounds chemistry, Humans, Magnetic Resonance Imaging, Methacrylates chemistry, Polyamines chemical synthesis, Polymerization, Temperature, Contrast Media chemistry, Nanoparticles chemistry, Organophosphonates chemistry, Polyamines chemistry
Abstract

Brush polymers are highly functional polymeric materials combining the properties of different polymer classes and have found numerous applications, for example, in nanomedicine. Here, the synthesis of functional phosphonate-ester-bearing brush polymers based on poly(2-oxazine)s is reported through a combination of cationic ring-opening polymerization (CROP) of 2-ethyl-2-oxazine and reversible addition-fragmentation chain transfer (RAFT) polymerization. In this way, a small library of well-defined (Đ ≤ 1.17) poly(oligo(2-ethyl-2-oxazine) methacrylate) P(OEtOzMA) n brushes with tunable lower critical solution temperature (LCST) behavior and negligible cell toxicity is prepared. Upon deprotection, the phosphonic acid end-group of the P(OEtOzMA) n brush enables the successful grafting-onto iron oxide nanoparticles (IONPs). Colloidal stability of the particle suspension in combination with suitable magnetic resonance imaging (MRI) relaxivities demonstrates the potential of these particles for future applications as negative MRI contrast agents., (© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2019
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