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Modern biopolyamide-based materials: synthesis and modification

The wider use of renewable feedstock in structural applications, where high mechanical performance is required, can be achieved by the application of recently developed engineering biopolymers and their further modification by micro- and nanoparticles. In this review, we present the current state of the art of biopolyamide materials for structural and functional applications. The...

1,2-Propanediolizobutyl POSS as a co-flame retardant for rigid polyurethane foams

Polyurethane (PU) foams physically modified by two additive phosphorous flame retardants (FR)—phenol isobutylenated phosphate or phenol isopropylated phosphate, and chemically reinforced by functionalized 1,2-propanediolizobutyl POSS (PHI-POSS) have been synthesized and investigated towards thermal and mechanical properties, as well as flammability behaviour. The foamed PU hybrid...

Molecular dynamics in polyurethane foams chemically reinforced with POSS

In this work, we report on the thermal and thermomechanical properties of rigid PU foams modified with POSS moieties, paying special attention to molecular dynamics of these systems. 1,2-Propanediolisobutyl POSS (PHI-POSS) are used as pendent groups and octa(3-hydroxy-3-methylbutyldimethylsiloxy) POSS (OCTA-POSS) serve as chemical crosslinks. DSC reveals an initial slowing down...

Studies on the thermal properties and flammability of polyamide 6 nanocomposites surface-modified via layer-by-layer deposition of chitosan and montmorillonite

In this work, layer-by-layer assembly technique has been employed to deposit cationic chitosan (CH) and anionic montmorillonite (MMT-Na+) polyelectrolyte coatings on polyamide 6 (PA6). Without an additional surface treatment, 5, 10 and 20 bilayers of CH/MMT-Na+ were successfully adsorbed on PA6 matrix as confirmed by XRD, ATR-FTIR and SEM–EDX results. The thermal stability was...

The influence of POSS nanoparticles on selected thermal properties of polyurethane-based hybrids

Krzysztof Pielichowski 0 1 0 Department of Chemistry and Technology of Polymers, Cracow University of Technology , ul. Warszawska 24, 31-155 Krako ́w , Poland 1 & Krzysztof Pielichowski Organic-inorganic

Thermal stability of gamma-irradiated polyurethane/POSS hybrid materials

Pielichowski 2 & Traian Zaharescu In this work, new version: we report essential data on the stability of gamma-irradiated polyurethanes chemically modified by octa(3-hydroxy-3-methylbutylmethylsiloxy) POSS (o

Thermal stability and flammability of polyurethane foams chemically reinforced with POSS

This work reports on the thermal stability and flammability of a novel class of rigid polyurethane foams chemically modified by functionalized 1,2-propanediolisobutyl POSS (PHI-POSS) as a pendant group and octa (3-hydroxy-3-methylbutyldimethylsiloxy) POSS (OCTA-POSS) as a chemical cross-link. The foamed hybrid materials were prepared in a three-step process using a sorbitol-based...

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

. Paweł Kicilin´ ski . Krzysztof Pielichowski 0 0 A. Leszczyn ́ska (&) P. Kicilin ́ski K. Pielichowski Department of Chemistry and Technology of Polymers, Cracow University of Technology , ul. Warszawska

Bio-polyamides based on renewable raw materials

Structural characterization of a series of novel bio-polyamides based on renewable raw materials—PA 4.10, PA 6.10, PA 10.10, and PA 10.12—was performed by Fourier transform infrared spectroscopy (FTIR) and wide-angle X-ray diffraction (WAXD). Infrared spectra and the WAXD patterns indicate the coexistence of different crystalline forms, α- and γ-triclinic and β-pseudohexagonal...

PVC/MMT nanocomposites

Poly(vinyl chloride) (PVC) nanocomposites with sodium montmorillonite (Na-MMT) and organically modified MMT (O-MMT) have been prepared by melt processing using mixing and extrusion techniques. The differential scanning calorimetry (DSC) with stochastic temperature modulation (TOPEM™) results show that the glass transition temperature (T g) of PVC is slightly higher than T g of...

The Effect of Nanoclay on Dust Generation during Drilling of PA6 Nanocomposites

During the past decade, polymer nanocomposites have emerged as a novel and rapidly developing class of materials and attracted considerable investment in research and development worldwide. However, there is currently a lack of information available in the literature on the nano and ultrafine particle emission rates from these materials. In this paper, influence of nanoclay on...

The Effect of Nanoclay on Dust Generation during Drilling of PA6 Nanocomposites

During the past decade, polymer nanocomposites have emerged as a novel and rapidly developing class of materials and attracted considerable investment in research and development worldwide. However, there is currently a lack of information available in the literature on the nano and ultrafine particle emission rates from these materials. In this paper, influence of nanoclay on...

Thermal Behavior and Flammability of Polyurethanes Based on Diphenylmethane-4,4′-diisocyanate and Incorporating 3-Chloro-1,2-propanediol in the Main Chain

For a series of diphenylmethane-4,4′-diisocyanate (MDI) and 3-chloro-1,2-propanediol (CPDO), propanediol (PDO), or polyoxyethyleneoxidediane (POEOD) based polyurethanes degradation profiles and flammability were investigated by thermogravimetric analysis (TGA) alone or coupled with Fourier transform infra-red spectroscopy (FT-IR), differential scanning calorimetry (DSC), and...

Cure Schedule of Epoxides and Their Sulfur-Containing Derivatives. Kinetic Study

A series of model epoxides and their sulfur-containing derivatives have been cured by hexahydrophthalic anhydride. The curing process was kinetically analysed using differential scanning calorimetry data. It has been found by means of Friedman and Ozawa–Flynn–Wall methods that the apparent activation energy (E) values of the cure process are higher for (1,3-oxothiolane-2-thione)s...