Synthesis of imidized nanoparticles containing soy oil under various reaction conditions

Samyn, Pieter; Nieuwkerke, Dieter Van; Schoukens, Gustaaf; Stanssens, Dirk; Vonck, Leo; Abbeele, Henk Van den

doi:10.1016/j.eurpolymj.2015.01.036

Cited by 7 publications

(3 citation statements)

References 38 publications

(38 reference statements)

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“…Depending on the type of incorporated oil, the oil gradually releases below T g and progressing continuously above T g in various intensities, or the oil remains fully stable below T g , and only releases above T g . The oil release of SMI/SO happens progressively below T g in agreement with its particle morphology presenting an interpenetrating network of imide and oil with nanoporosity . In comparison, the release of SMI/HCO below T g is more intense as indeed a higher porosity of the nanoparticles with cauliflower‐like structure was previously observed .…”

Section: Resultssupporting

confidence: 79%

“…The chemical and physical characterization of SMI/oil nanoparticles has been done before together with an optimization of the reaction conditions and SMA versus oil composition : the physical properties of the aqueous dispersions are summarized in Table . Various morphologies of the SMI/oil nanoparticles have been illustrated before by TEM , most notably a nanoporous particle shape for SMI/SO and more solid‐like nanoparticle shapes for SMI/CO and SMI/Sfo. The named solid‐like nanoparticles look homogeneous over the entire volume.…”

Section: Resultsmentioning

confidence: 93%

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Thermal release of vegetable oils loaded in hydrophobic polymer nanoparticles

Samyn

Stanssens²

2015

Euro J Lipid Sci & Tech

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The encapsulation of vegetable oils during imidization of poly(styrene‐co‐maleic anhydride) provides stable aqueous dispersions of oil‐filled nanoparticles with 50 wt% oil. The functionality of nanoparticles with soy‐, corn‐, rapeseed‐, sunflower‐, castor‐, and hydrogenated castor‐oil, can be controlled by thermal release upon heating at 120–250°C for 2 min to 6 h. In a first part, the intrinsic thermal properties of the nanoparticles have been determined by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). The differences in calculated imide content illustrate that the transition phenomena depend on complex interactions between the oil and imide phase. The TGA results show that bursting of the particles is not a main release mechanism while the oil is either progressively released below or above the glass transition temperature, which is best monitored by DMA. In a second part, the release profiles are determined from FTIR and Raman spectra following different trends according to the type of encapsulated oil and nanoparticle morphology, i.e., solid, nanoporous, cauliflower‐like, or true core‐shell. Also the interference with imidization during heating influences the oil release. The kinetics and mechanism of oil release can be systematically described after fitting with mathematical models. Practical applications: The nanoparticles can be incorporated as coating pigments for packaging paper or used for surface functionalization of natural fibers, where controlled release of the oil provides a required degree of hydrophobicity. Different types of vegetable oil were incorporated in imidized nanoparticles, resulting in various particle morphologies (e.g., solid, nanoporous, cauliflower‐like, or true core‐shell) with characteristic release profiles of the oil as a function of temperature and time.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 93%

Thermal release of vegetable oils loaded in hydrophobic polymer nanoparticles

Samyn

Stanssens²

2015

Euro J Lipid Sci & Tech

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“…More interestingly, these nanoparticle coatings can be used as a model-system where the bio-renewable content of the nanoparticle structures and coatings could be improved by substituting towards a maximum of 70 wt % of the polymer coating with various vegetable oils, i.e., SMI/oil, including palm-, soy-, sunflower-, rapeseed, caster or cornoil [153]. The synthesis of such nanoparticles with diameters of 20 to 50 nm has been well-documented for different concentrations of soy-oil [154], and palm-oil [155]. The presence of vegetable oil in the coating enhances the hydrophobicity and more importantly, it serves as a natural binder in between the nanoparticles resulting in continuous and homogeneous coatings with reduced brittleness and high thermal stability.…”

Section: Nanoscale Surface Structuring Towards (Super-)hydrophobic Pamentioning

confidence: 99%

Bio-Based Coatings for Paper Applications

2015

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Abstract:The barrier resistance and wettability of papers are commonly controlled by the application of petroleum-based derivatives such as polyethylene, waxes and/or fluor-derivatives as coating. While surface hydrophobicity is improved by employing these polymers, they have become disfavored due to limitations in fossil-oil resources, poor recyclability, and environmental concerns on generated waste with lack of biodegradation. Alternatively, biopolymers including polysaccharides, proteins, lipids and polyesters can be used to formulate new pathways for fully bio-based paper coatings. However, difficulties in processing of most biopolymers may arise due to hydrophilicity, crystallization behavior, brittleness or melt instabilities that hinder a full exploitation at industrial scale. Therefore, blending with other biopolymers, plasticizers and compatibilizers is advantageous to improve the coating performance. In this paper, an overview of barrier properties and processing of bio-based polymers and their composites as paper coating will be discussed. In particular, recent technical advances in nanotechnological routes for bio-based nano-composite coatings will be summarized, including the use of biopolymer nanoparticles, or nanofillers such as nanoclay and nanocellulose. The combination of biopolymers along with surface modification of nanofillers can be used to create hierarchical structures that enhance hydrophobicity, complete barrier protection and functionalities of coated papers. OPEN ACCESSCoatings 2015, 5 888

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