Abstract:The widespread use of thermal analysis (TA) by scientists as a laboratory technique carries with it a working vocabulary. This document is intended to provide those working in the field with a consistent set of definitions to permit clear and precise communication as well as understanding. Included in the document are the definitions of 13 techniques, 54 terms within the glossary, as well as symbols and units.

No abstract

No abstract

Although alluded to occasionally during the previous discussions of chemistries used for reactive processing, the physical nature of the product probably has a significant effect on its useful properties. At the same time, the chemistries used often are dominant in the preparation of the final product. This is also one of the least well characterized aspects of reactive processing. The type of matrix formed during alloying, blending, modification, graft polymerizing, etc. (dispersion, co-continuous network or interpenetrating network) and the domains (characterized by various sizes and shapes) depend both on the chemistry being utilized and the mixing produced by the equipment used. A fine balance is maintained between the chemistry being used—its time and temperature requirements—and the physical aspects of mixing and dispersion. The design of the mixing operations must consider the interplay of these two aspects to control the physical properties of the products generated. The area of reactive processing of rubbers will continue to grow and many of the factors that control the physical properties of the product will be controlled by variations in the mixing and chemical processes developed.

of browniine, 107 mg (1.05 mmol) of (S)-(+)-2-methylbutyric acid ([a]22!) +19.3°( CH2C12)), 217 mg (1.05 mmol) of DCC, and 32.1 mg (0.26 mmol) of DAP in 10 mL of dichloromethane was heated at reflux for 20 h. The usual workup procedure furnished 74 mg of crude product which was placed upon a column containing 15 g of alumina (activity III). The column was eluted with ethyl acetate to yield 62.2 mg (61%) of 14-(2-methylbutyryl)browniine (10), mp 110.5-111.5 °C. Recrystallization from hexane/acetone twice afforded 10 with a melting point of 113-118 °C and [a]17D +39.9°(c, 0.72, MeOH), in excellent agreement with the corresponding measurements for a sample of glaucedine isolated from the plant.