A Conversation with Sandra M. Gilbert

Gilbert, Sandra M.; Hongo, Garrett; Parke, Catherine N.

doi:10.1353/mis.1986.0004

Cited by 5 publications

(4 citation statements)

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“…From this viewpoint, the ratio between endotherms A and B has been suggested to be a good measure for the level of gelation of a processed sample. Several other workers [16][17][18][19][20][21][22][23][24][25] have been using this method to quantify the level of gelation as a function of the processing conditions. A drawback of the DSC technique is that it does not provide any direct information about structural changes during the thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Structural aspects of suspension poly(vinyl chloride): The thermal aspects of rigid suspension PVC

Scherrenberg

Reynaers

Gondard³

et al. 1994

J Polym Sci B Polym Phys

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The thermal aspects of a series of suspension PVC samples, polymerized at different temperatures, have been investigated using DSC, WAXS, and dielectric measurements. The observed thermal behavior, extending over a wide temperature range, is in line with the presence of ordered entities, having a wide distribution of size and perfection. The importance of small variations of the syndiotacticity on the crystallizability is demonstrated by cooling experiments. © 1994 John Wiley & Sons, Inc.

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Section: Introductionmentioning

confidence: 99%

Structural aspects of suspension poly(vinyl chloride): The thermal aspects of rigid suspension PVC

Scherrenberg

Reynaers

Gondard³

et al. 1994

J Polym Sci B Polym Phys

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“…It shows rodent teeth marks. The anatomical and taxonomic identification of bird bone remains was carried out using reference manuals (Cohen and Serjeantson, 1996; Gilbert et al, 1981; Olsen, 1979; Serjeantson, 2009) and by consulting avian osteological collection of the Miguel Lillo Foundation.…”

Section: Resultsmentioning

confidence: 99%

Long-term interactions between avifauna and humans in the southern Andean Puna during the Late-Holocene

Velardez-Fresia,

Urquiza

2024

The Holocene

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By comparing the present and past avifauna, we investigate the human practices that involved the knowledge and interaction with birds during the Late-Holocene in Puna Austral Argentina. Ethnoarchaeological methodology was used, which included the analysis of feathers recovered from archeological excavations and interviews with local people. Interviews and bird observations were carried out in the spring/summer months, and in some cases the interviewees accompanied us to make the sightings. The results show a correspondence between current and past bird populations for some species of Passeriformes, Strigiformes, Rheiformes, and Anseriformes. Continuity was observed in the interaction of people with certain birds. This is linked to their farming and livestock lifestyle. Currently this situation is changing due to the increasing expansion of mining activities. This research establishes a baseline to compare the consequences of mining on avifauna and the local population.

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“…Figure 8 shows the DSC trace for sample A as the sample was heated from room temperature to 240ЊC. Two broad endotherms are typically observed for processed PVC 22 ; the higher temperature endotherm (B) arises from primary crystallinity originally present in the PVC powder grains after polymerization, and its onset temperature corresponds the highest processing temperature experienced by the PVC. The lower temperature endotherm A is due to melting of secondary crystallinity produced on cooling after processing.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Silane crosslinking of plasticized poly(vinyl chloride)

Fiaz

Gilbert

1998

Adv. Polym. Technol.

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In this study the use of three different types of aminosilanes for crosslinking plasticized PVC was investigated. The processing techniques used were milling, followed by press molding and extrusion. The processing conditions were carefully adjusted to minimize premature crosslinking. Crosslinking was carried out by immersing the samples in hot water for 4 h. Gel content was determined by Soxhlet extraction in tetrahydrofuran. Tensile properties were measured at room temperature and at 100°C or 130°C. Bis(γ‐trimethoxysilylpropyl)amine was found to be the best of the three silanes investigated for crosslinking plasticized PVC, enabling adequate gel content to be obtained to improve the properties at elevated temperature, while avoiding premature crosslinking. Compounds stabilized with either tin or Ba/Zn possessed adequate thermal stability at 190°C. No changes were seen in the tensile properties at room temperature, but significant improvements were obtained at 100°/130°C. Results obtained using thermomechanical analysis showed increased penetration resistance with increase in gel content. © 1998 John Wiley & Sons, Inc. Adv in Polymer Techn 17: 37–51, 1998

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A Conversation with Sandra M. Gilbert

Cited by 5 publications

References 0 publications

Structural aspects of suspension poly(vinyl chloride): The thermal aspects of rigid suspension PVC

Structural aspects of suspension poly(vinyl chloride): The thermal aspects of rigid suspension PVC

Long-term interactions between avifauna and humans in the southern Andean Puna during the Late-Holocene

Silane crosslinking of plasticized poly(vinyl chloride)

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