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Potentially Biodegradable “Short-Long” Type Diol-Diacid Polyesters with Superior Crystallizability, Tensile Modulus, and Water Vapor Barrier
Get PDFLong-chain aliphatic polyesters are potentially biodegradable polymers with PE-like structures and properties. To develop biodegradable long-chain polyesters for practical applications, a series of “short-long” type long-chain polyesters, PEsxy (x = 2−4, 6, y = 10−16), are designed and synthesized from C2−4,6 short-chain α,ω-diols, and C10−16 long-chain α,ω-diacids via melt polycondensation. They showed intrinsic viscosity as high as 0.93− 1.64 dL/g and PE-like crystal structure, rapid crystallization, and ductile tensile behavior. Their crystallization and melting temperature showed an increasing trend with diacid chain length and an apparent odd−even effect. The highest melting temperature reached 94 °C, and the highest tensile strength came at 53 MPa. Chain length-dependent biodegradability in soil and hydrolytic degradation under neutral conditions at 30−60 °C was also observed. In comparison with the widely used biodegradable poly(butylene adipate-co-terephthalate) (PBAT) copolyester, these polyesters show comparable tensile strength, flexibility, and oxygen barrier performance but superior and desirable crystallizable, tensile modulus, and water vapor barrier performance
Winston Churchill and the Beginnings of the Cold War
Get PDFMany historians such as David Reynolds and J. Samuel Walker mark the beginning of the Cold War with Winston Churchill’s Iron Curtain speech in Fulton, Missouri. Other historians, such as Jennifer Luff have argued, however, that anticommunism attitudes had existed in the United States of America (USA) long before the threat of the Russian Soviet Union (USSR), and these attitudes were only amplified by the words of Churchill. Historians have long examined the attitudes of the USA and the United Kingdom (UK) toward socialism and communism in the year before, during, and after World War II. While both countries struggled with the idea of communism, their reactions, and general attitudes to social were dramatically different. This paper examines sources to determine how the USA and the UK came together against the USSR to stop the spread of communism. There are many theories about how, when, and why the tensions between the Americans and the Soviets rose to the heights that they did. Some historians cite Churchill as the instigator while others side with the idea that these tensions had existed for decades before the threat of the USSR. By examining the carefully curated image of Churchill and the American attitudes about the Soviets and socialism in general this paper argues that Churchill’s speech was taken as a call to action for the Western powers to come together in the fight against communism
The Determinants of Housing Prices in Micropolitan Areas
Get PDFDefined in 2003 by the US Office of Management and Budget, Micropolitan areas consist of 10,000 to 50,000 residents, and are partially considered to be emerging metropolitan areas. Given their relatively recent definition, the vast majority of research does not pertain to the micropolitan definition. Using a data set of 500+ micropolitan areas across 600+ counties in the contiguous 48 states, this study aims to seek out and identify intrinsic and socioeconomic determinants of housing prices in micropolitan areas, as well as analyze the severity of their impact, by way of linear OLS regression. The intended impact would be painting a better picture of housing affordability and providing better understanding on housing price fluctuations in areas like our very own Pittsburg, KS. Using these findings, Pittsburg officials and citizens would be provided a better insight on how to upkeep housing value, and derive cultural and social norms that add to the property value of the city, both from an investors and a resident’s perspective
Mitchell, Charles Wesley and Annettie, Diary
Get PDFA diary detailing various events in Cherokee County, Kansas throughout 1913, written by a carpenter named Charles Wesley Mitchell and his wife Annettie Mitchell.https://digitalcommons.pittstate.edu/fa/1436/thumbnail.jp
Kids standing in front of Horace Mann
No full textBlack and white photograph. Four kids stand in front of the doors to Horace Mann. Appears to be the 1950s based on the skirts, hairstyles, and shoes the girls are wearing.https://digitalcommons.pittstate.edu/unihistoryphotos/1164/thumbnail.jp
Yates East Entrance and Kelce Planetarium
No full textBlack and white photograph of Yates Hall and Kelce Planetarium as seen from the sidewalk on Joplin St.https://digitalcommons.pittstate.edu/unihistoryphotos/1264/thumbnail.jp
Domestic Sciences Class
No full textStudents working on assignments at their desks.https://digitalcommons.pittstate.edu/nellydonphotos/1009/thumbnail.jp
Senator James A. and Nell Donnelly Reed
No full textBlack and white photo of Nell Donnelly Reed and her husband Senator James A. Reed.https://digitalcommons.pittstate.edu/nellydonphotos/1006/thumbnail.jp
Domestic Sciences Class
No full textBlack and white photograph of students sewing at tables, both by hand and with machine. Another is working on the hem of a garment worn by a student in the back.https://digitalcommons.pittstate.edu/nellydonphotos/1008/thumbnail.jp
McPherson South Entrance
No full textColor photo of McPherson as seen from the southeasthttps://digitalcommons.pittstate.edu/mcphersonbuilding/1006/thumbnail.jp