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In this report, we studied dielectric loss mechanisms in a 1–3 type of polymer nanocomposites, i.e., nanofibers or nanotubes in a polymer matrix. Sodium titanate nanotubes (TiNTs, 8–10 nm outer diameter and 300–500 nm long), which were synthesized by the hydrothermal method, were used as the fillers. The polymer matrix was a high permittivity relaxor ferroelectric polymer, poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)...
The dynamic effects of unentangled star-shaped polymers with extremely small branches on the plasticization of miscible polymer blends are investigated using ultra-small branched star poly(ε-caprolactone)s (USB-SPCLs), poly(vinyl chloride) (PVC), and their blends. Photon correlation dynamics of USB-SPCLs supports our previous suggestion that a whole USB-SPCL molecule acts as a single coarse-grain...
Lots of works have been done on the pore formation of β nucleated PP membranes during stretching, and most of these works focus on the effects of crystal form and processing conditions on the performance of PP membrane. In our work, the crystalline morphology of β crystal was modulated by adding a small amount of ultrafine full-vulcanized powder rubber (EA-UFPR), and subsequently, the influence of...
A series of poly(ethylene-co-1,4-cyclohexanedimethylene 2,5-furandicarboxylate)s (PECFs) with different compositions were synthesized from 2,5-Furandicarboxylic acid (FDCA), 1,4-cyclohexanedimethylene (CHDM) and ethylene glycol (EG). Their chemical structures, composition and sequence distribution were determined by FT-IR, 1H NMR and 13C NMR. The composition of the resulted polyesters could be controlled...
We have fabricated amorphous polymer composites with ultralow silica contents (e.g., 0.1 wt %), without nano- or microclusters but with silica units distributed quasi-regularly within the polymer network matrix. This fact and other data obtained imply the existence of subnanometer-sized silica nodes (SNSSN) only in this case which are connected covalently with the matrix, i.e., the formation of the...
Computer simulation could be a useful technique to scrutinize the properties of individual polymers as well as their blends. However, there is no work on computer simulation of thermoplastic elastomer from rubber-plastic blends. As representative example, binary compatibility of polyamide 6 (PA6) with fluoroelastomer (FKM) for a 40/60 composition of PA6/FKM thermoplastic elastomer was investigated...
Processable poly(cycloacetals) with high molar masses (Mn) up to 38 kDa were synthesized in a systematic manner. Di-trimethylolpropane (Di-TMP) was used as tetravalent alcohol and was combined with a series of available dialdehydes, after a model reactivity study. These polymers have a high thermal stability with degradation temperatures (Td) up to 370 °C while the glass transition temperatures (T...
Two diglycidyl ethers which consist of a flexible carbosilane segments and of rigid phenylene moieties (1 and 2) were synthesized and investigated in order to evaluate their heat-curing behavior (epoxy homopolymerization) as well as thermal and mechanical properties of the networked polymers. Differential scanning calorimetry (DSC) analysis revealed that melting points of both diepoxides were −73...
Polydimethylsiloxane (PDMS)-graft copolyimides were synthesized by polycondensation of 3,5-bis(4-aminophenoxy)benzyloxypropyl-terminated PDMS macromonomer with 4,4’-hexafluoroisopropylidene diphthalic anhydride (6FDA) followed by chemical imidization to investigate the effects of PDMS segment length of copolyimides on the membrane characteristics, the gas permeability and the pervaporation performance...
The review article describes research on different methods for manufacturing polymeric NF membranes. The primary focus is on NF composite membranes formed by interfacial polymerization. Within that space, topics covered in detail include the composite structure, monomeric and polymeric reactants employed to endow specific characteristics, and additives used to influence the reaction. Other approaches...
Hierarchical nanostructured polymeric dielectric composites (PGP) based on semicrystalline poly (vinylidene fluoride) (PVDF) matrix are fabricated by incorporating polyaniline-grafted-graphene oxide (G-graft-PANI). HR-TEM images show uniform dispersion of GO within PVDF matrix. FE-SEM micrographs of PGP composites indicate fibrillar morphology produced from supramolecular organization of G-graft-PANI...
Recently developed two-dimensional multilayer coextrusion and post-process drawing were combined to fabricate polyolefin composites with independently tunable size (9 μm width × 3 μm thickness to 5 μm width × 0.9 μm thickness) and mechanics (e.g. modulus from 1340 to 2010 MPa). Post-process drawing of the composite studied via in situ synchrotron WAXS and SAXS imparted higher crystallinity and more...
Interfacial structures of polymer matrix-filler particle composites play a crucial role in determining the properties of the composite materials, such as the gas separation performance of mixed matrix membranes. Monte Carlo simulations employing coarse-graining models show that the density distribution and the fraction of free volume of the polymer at the interface are dominated by the interaction...
Poly(ethylene 2,5-furan dicarboxylate) (PEF) is considered the biobased counterpart of the fossil based poly(ethylene terephthalate) for food packaging. In this research, PEF nanocomposites containing 2.5 wt% neat multi walled carbon nanotubes (MWCNTs), or functionalized MWCNTs or graphene oxide (GO), were in situ prepared by applying the melt polycondensation method. The nanocomposites showed faster...
A novel self-healing semi-interpenetrating network hydrogel based on a natural polymer (konjac glucomannan, KGM) and synthetic polymer (polyacrylamide, PAAm) is prepared by a simple one-pot synthesis method. The hydrogels show excellent self-healing ability at ambient temperature without the need for any stimulus or healing agent and high recovery degrees (up to 73% tensile strength) can be achieved...
Cavitation phenomenon has been marginalised in the past, although it alters morphology and properties of semicrystalline polymers during their plastic deformation. The formation of cavitational pores are due to the loss of cohesion by the amorphous phase. The research in this paper has been conducted on cavitating and non-cavitating high density polyethylenes with identical microstructure of the crystalline...
The cross-link inhomogeneity of phenolic resins at the initial stage of curing in a temperature range of 110–130 °C was investigated through structural analysis of the network structure evolution mechanism using 1H-pulse nuclear magnetic resonance spectroscopy and complementary small- and wide-angle X-ray and neutron scattering methods. Two types of phenolic resins, PR06 and PR12, were prepared with...
The microstructure and ballistic impact toughness was investigated for a series of dynamically heterogeneous epoxy blends composed of diglycidyl ether of bisphenol A (DGEBA) that is cross-linked with stoichiometric mixtures of a rigid cycloaliphatic diamine and flexible polypropylene oxide based diamines. The ballistic impact resistance of the blends correlates with the presence of nano-scale structure,...
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