Characterisation of melt processed nanocomposites of Polyamide 6 subjected to uniaxial-drawing

In this paper, the processing and characterization of Polyamide 6 (PA6) nanocomposites containing graphite nanoplatelets (GNPs) is reported. PA6 nanocomposites were prepared by melt-mixing using an industrial, co-rotating, intermeshing, twin-screw extruder. A bespoke screw configuration was used that was designed in-house to enhance nanoparticle dispersion into a polymer matrix. The effects of nano-filler type (xGnPTM M-5 and xGnPTM C-500), nano-filler content, and extruder screw speed on the bulk properties of the PA6 nanocomposites were investigated. The crystalline structures of PA6 nanocomposites are related to thermal treatment, stress history and the presence of moisture and nanofillers. DSC, Raman and XRD studies show an increase in crystallinity with increasing GNP content and a phase transformation between α-form to γ-form crystals as a result of the heterophase nucleation effect. The effect of uniaxial stretching on PA6 nanocomposites was investigated by drawing specimens heated at temperatures below the melting temperature. DSC and Raman studies on the drawn samples show an increase in yield stress as the GNP content increases due to the strain induced crystallization and γ—β transition during stretching. The rheological response of the nanocomposites resemble that of a ‘pseudo-solid’, rather than a molten liquid, and analysis of the rheological data indicates that a percolation threshold was reached at GNP contents of between 10–15wt%. An increase in tensile modulus of as much as 412% was observed for PA6/C-500 xGnPTM composites, at a filler content of 20wt%. The enhancement of Young’s modulus and yield stress can be attributed to the reinforcing effect of GNPs and their uniform dispersion in the PA6 matrix. The electrical conductivity of the composite also increased with increasing GNP content, with an addition of 15wt% GNP resulting in a 6 order-of-magnitude increase in conductivity. The effects of uniaxial-drawing and the inclusion of multiple nano-filler varieties on the electrical and mechanical properties are currently under investigation.

Architectural drawing for Beckman Hall

Architectural drawing of the site for the Arnold and Mabel Beckman Business and Technology Hall, Chapman University, Orange, California, ca. 1997.

Architectural drawing for the Hutton Sports Center, Chapman College, Orange, California

Architectural drawing for the Hutton Sports Center, 219 E. Sycamore St., Chapman College, Orange, California. The Harold Hutton Sports Center, completed in 1978, is named in honor of this former trustee, and made possible by a gift from his wife, Betty Hutton Williams.

Architectural drawing of Morlan Residence Hall, Chapman College, Orange, California.

Architectural drawing of Morlan Residence Hall, married student apartments and lounge, Chapman College, Orange, California. John Galbraith & Associates, Architectural Project Development. Dedicated November 20, 1963 and named in honor of Dr. Halford J. Morlan and Perwyn Bohrer Morlan. An addition was dedicated December 1, 1965.

Architectural drawing of Moulton Hall, Chapman College, Orange, California

Architectural drawing of Moulton Hall, Orange, California. Completed in 1975 (2 floors, 44,592 sq.ft.), this building is named in memory of an artist and patroness of the arts, Nellie Gail Moulton. Within this structure are the departments of Art, Communications, and Theatre/Dance as well as the Guggenheim Gallery and Waltmar Theatre.

Architectural drawing of Moulton Hall, Chapman College, Orange, California

Architectural drawing of Moulton Hall, Orange, California. Completed in 1975 (2 floors, 44,592 sq.ft.), this building is named in memory of an artist and patroness of the arts, Nellie Gail Moulton. Within this structure are the departments of Art, Communications, and Theatre/Dance as well as the Guggenheim Gallery and Waltmar Theatre.

Overview drawing of Moulton Hall, Chapman College, Orange, California

Architectural drawing showing Moulton Hall, Orange, California. Completed in 1975 and housing the departments of Art, Communications, and Theatre/Dance as well as the Guggenheim Gallery and Waltmar Theatre.

Architectural drawing of Moulton Hall Fine Arts Complex, Chapman College, Orange, California

Architectural drawing of Moulton Hall, showing Waltmar Theatre, Orange, California. Completed in 1975 (2 floors, 44,592 sq.ft.), this building is named in memory of an artist and patroness of the arts, Nellie Gail Moulton. Within this structure are the departments of Art, Communications, and Theatre/Dance as well as the Guggenheim Gallery and Waltmar Theatre. Waltmar Theatre was a gift from the late Walter and Margaret Schmid.

Illustration - Drawing of Pig while Blindfolded, 23 July 1900

The illustration of a pig is part of an autograph book collection of Ethelwyn Wetherald. Her collection consists of drawings of pigs her guests create while blindfolded. The signature of each guest accompanies the illustration. This illustration was done by Margaret H. Dorland in the year 1900.

Canadian Niagara Power Glass Slide - Engineer Drawing of Sections of Discharge Tunnel

Consulting Engineer drawing of Sections of the Discharge Tunnel. Included in the drawing is the "cross section of tunnel with timbering" and "longitudinal section showing Timber in straight tunnel". Dated October 1902.