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From linear to long-chain branched poly(ethylene terephthalate) – reactive extrusion, rheology and molecular characterization
Poly(ethylene terephthalate) is one of the most widely used polymers in packaging industry, due to its high mechanical strength, chemical resistance, and barrier functions. However, its processing is determined by degradation and low viscosity. In particular, foaming and film blowing is restricted by the linear structure of the molecule and low melt strength. The stability of three linear commercial PET grades produced by different synthesis routes with different molar masses is analyzed in regards of processing at industrial scale. Subsequently, reactive processing with three multi-functional chain extenders (pyromellitic dianhydride, PMDA, tetraglycidyl diamino diphenyl methane, TGDDM, and...
Writing in Red
In the German Democratic Republic words and ideas mattered, both for legitimizing and criticizing the regime. No wonder, then, that the ruling SED party created a Writers Union to mold what writers publicly wrote and said. Its chief task was ideological: creating a socialist and antifascist culture. But it was also supposed to advance its members' professional interests and enable them to act as public intellectuals with a say in the direction of socialism. Many writers demanded that it pursue this second function as well, which brought it into conflict with the SED. This book explores how the union became a site for the contestation of writers' roles in GDR society with consequences well be...
