Structure-microhardness correlation in blends of nylon 6/nylon 66 monofilaments

Mixing of polyamide 6 (PA 6) and polyamide 66 (PA 66) is integrated in the trend of development of new and improved materials by combination of different polymers and some reinforcing materials to polymer composites. The specific polymer composite PA 6/PA 66 reinforced with short glass-fibers combines the good coloring of PA 6, and the small moisture absorption of PA 66. Technical applications of PA 6/PA 66 composites are mainly used in the automotive industry. Specific requirements of this industry lead to the necessity to optimize the material resistance against crack propagation of the PA 6/ PA 66 composites, using mechanical and fracture mechanical methods. So, the present investigations focus on fracture mechanics toughness optimization of the PA 6/PA 66 composites, including unstable and stable crack growth. The aim of this toughness optimization is to find out the optimal mixing ratio of PA 6/PA 66. Applications of PA 6/PA 66 in the automotive industry and specific client wishes are the main reasons for black-coloring of the PA materials. The influence of several black-colorants (carbon black, nigrosine, spinel, iron oxide) on mechanical and fracture mechanical properties of the PA composites is also investigated using fracture mechanical methods. As experimental fracture mechanical method, preferentially, the instrumented Charpy impact test (ICIT) and the new cut method to determine the stable crack growth of glassfiber reinforced materials was used.

Section: Resultsmentioning

confidence: 99%

Toughness optimization of glass‐fiber reinforced PA 6/PA 66‐based composites: Effect of matrix composition and colorants

Nase

Langer²,

Schumacher

et al. 2008

“…The circles correspond to the data of ref. 14 and the squares indicate the data of the samples investigated in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…Microindentation tests have also been performed on composites of carbon fibers embedded in thermoplastic and thermoset matrices 12. Recently, microindentation appears as a promising tool for micromechanical and microstructural investigation of polymer blends 13, 14. For instance, it has been found that increasing the ethylene‐co‐propylene rubber content into isotactic polypropylene lowers the hardness value by 30–40% 13…”

Section: Introductionmentioning

confidence: 99%

Microhardness studies of PMMA/natural rubber blends

Mina

Ania

Calleja

et al. 2003

Self Cite

ABSTRACT:The microhardness, H, of PMMA/natural rubber blends, prepared following the solution method has been investigated by means of the microindentation technique. Hardness changes are correlated with the variation of the glass transition temperature. The influence of temperature and degree of deformation on H were additionally examined. The inclusion of rubber particles in the PMMA matrix is shown to soften the blends. The variation of the micromechanical property at the phase boundary of polymer/rubber particle has been studied. Results reveal that H drastically drops at the interphase. In the case of the drawn materials, the indentation anisotropy (⌬H) is shown to gradually increase with the draw ratio, where ⌬H is found to be higher for the PMMA/rubber blend than for the original PMMA. This result is explained by the higher orientation of the PMMA molecules near the periphery of stretched rubber particles.

“…In the preceding studies, the correlation between the nanostructure and the micromechanical properties of the polymers was well characterized 22–26…”

Section: Introductionmentioning

confidence: 99%

“…In the preceding studies, the correlation between the nanostructure and the micromechanical properties of the polymers was well characterized. [22][23][24][25][26] The aim of this study was to investigate the nanostructure and micromechanical properties of these three different types of polyesters, that is, saturated, unsaturated with a cis double bond, and unsaturated with a triple bond in the monomeric unit.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical behavior related to the nanostructure of biodegradable polyesters

Cagiao

Buzin

Kricheldorf

et al. 2010

Self Cite

The microhardness of a series of biodegradable polyesters was determined. The nanostructural features of these materials were studied by wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and differential scanning calorimetry. Analysis of the SAXS and WAXS patterns allowed direct derivation of the degree of crystallinity and crystal thickness values, and correlations of the micromechanical properties are presented. The differences in the thermal and mechanical properties exhibited by the studied systems and the ones found in other aromatic polyesters are explained as due to the different chemical natures of the monomeric units.