Journal ArticleDOI
Dynamic Mechanical Study of the Factors Affecting the Two Glass Transition Behavior of Filled Polymers. Similarities and Differences with Random Ionomers
TLDR
In this article, dynamic mechanical measurements on several polymers filled with very fine silica particles revealed that these composites exhibit two tan δ peaks, one related to the usual polymer glass transition, while the other, occurring at a higher temperature, was assigned to the glass transition of regions containing reduced mobility.Abstract:
The dynamic mechanical measurements on several polymers filled with very fine silica particles revealed that these composites exhibit two tan δ peaks. One was related to the usual polymer glass transition, while the other, occurring at a higher temperature, was assigned to the glass transition of regions containing chains of reduced mobility. Since many aspects of this behavior were found to be analogous to those of random ionomers, the results support the validity of the EHM model of ionomer morphology. The particle content, the number of monomer units interacting strongly with the surface of the particles, the thermal history of the sample, and the average MW of the polymer were all found to have a significant effect on the area and the maximum of the new tan δ peak. These effects are discussed in terms of a model which is based on the EHM ionomer model but takes into account the formation of tightly bound and loosely bond polymer chains around the filler particles.read more
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Journal ArticleDOI
Load transfer in carbon nanotube epoxy composites
TL;DR: In this paper, the mechanical behavior of multi-walled carbon nanotube/epoxy composites was studied in both tension and compression, and it was found that the compression modulus is higher than the tensile modulus, indicating that load transfer to the nanotubes in the composite is much higher in compression.
Journal ArticleDOI
Quantitative equivalence between polymer nanocomposites and thin polymer films
Amitabh Bansal,Amitabh Bansal,Hoichang Yang,Hoichang Yang,Chunzhao Li,Kilwon Cho,Brian C. Benicewicz,Sanat K. Kumar,Linda S. Schadler +8 more
TL;DR: The thermomechanical properties of ‘polymer nanocomposites’ are quantitatively equivalent to the well-documented case of planar polymer films and it is conjecture that the glass-transition process requires that the interphase regions surrounding different particles interact.
Journal ArticleDOI
Dielectric properties of epoxy nanocomposites
Santanu Singha,M.J. Thomas +1 more
TL;DR: In this paper, the dielectric properties of epoxy nanocomposites with insulating nano-fillers, viz., TiO2, ZnO and AI2O3 were investigated at low filler concentrations by weight.
Journal ArticleDOI
PP/clay nanocomposites prepared by grafting-melt intercalation
Xiaohui Liu,Xiaohui Liu,Qiuju Wu +2 more
TL;DR: In this article, a polypropylene (PP)/clay nanocomposites (PPCN) were prepared via grafting-melt compounding by using a new kind of co-intercalation organophilic clay which had a larger interlayer spacing than the ordinarily organophilous clay only modified by alkyl ammonium.
Journal ArticleDOI
New advances in polymer/layered silicate nanocomposites
TL;DR: In this paper, a review of recent advances in polymer silicate nanocomposites is presented, highlighting the properties of specific nanocom composites while emphasizing the lack of properties trade-offs in these systems.