Abstract
The study describes the thermal properties of porous microspheres synthesized with functional monomer 4-vinylpyridine (4VP) and crosslinking agent trimethylolpropane trimethacrylate (TRIM). Polymeric 4VP–TRIM microspheres were prepared via seed polymerization, using polystyrene microbeads as a shape template. The resulting 4VP–TRIM microspheres were in the range of 9–12 μm, with specific surface area of about 200 m2 g−1. The thermal properties of 4VP–TRIM materials were evaluated by thermogravimetry and differential scanning calorimetry. By TG/FTIR/MS, it was observed that new porous materials exhibited multi-staged decomposition patterns, different from poly(TRIM) microspheres. DSC and TG experiments showed that water molecules were absorbed on the materials’ surface. The synthesized 4VP–TRIM microspheres exhibited rather high thermal stability. Their initial decomposition temperature was about 300 °C. During the microspheres’ decomposition, an evolution of carbon dioxide, water, and carbon monoxide as main gases, as well as of pyridine and aliphatic compounds, was observed. It was confirmed that the evolved pyridine accelerated the degradation of copolymeric network.
Highlights
Nowadays polymer particles have many areas of applications such as separation, chromatography, adsorbents, ion exchangers, drug-delivery systems, or solid-phase peptide synthesis
The aim of this work was an investigation of the thermal properties of 4VP–TRIM polymeric microspheres prepared by seed polymerization, using differential scanning calorimetry (DSC) and thermogravimetry coupled with FTIR and QMS to analyze the evolved products during their decomposition
The thermal behavior of new 4VP–TRIM microspheres prepared by seed polymerization was investigated by means of the DSC and STA-FTIR-QMS methods
Summary
Nowadays polymer particles have many areas of applications such as separation, chromatography, adsorbents, ion exchangers, drug-delivery systems, or solid-phase peptide synthesis. A more complicated route of functionalizing the surface of microspheres is the incorporation into the polymer network of a reactive monomer capable of derivatization, e.g., epoxide rings or chloroalkyl moiety [7, 8]. Depending on the type of pore-forming diluents and the amount of the crosslinker, macroporous polymer networks with micro-, meso-, and macropores can be produced. The size of polymeric microspheres and their size distribution are related to the polymerization method. Uniform crosslinked polymeric microspheres with narrow size distribution and the size range of 5-20 lm can be prepared by several multistage methods: activated swelling procedure, seeded emulsion polymerization, staged shape template polymerization, or two-stage precipitation polymerization [9,10,11]. In most cases reported in the literature, polystyrene particles are used, but poly(methyl methacrylate) or poly(glycidyl methacrylate) microbeads can be
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