Swell index performance

Table I shows a comparison of free film swell Index results as a function of crosslinker at a constant comonomer level (0.3 moles/kg of polymer). ABDA and AEP gave crosslinking performance Identical to a conventional crosslinker, BNMA. However, derivatives which cannot cycllze, either because the amide has an additional substituent, as In 13, or the chain connecting the amide to the blocked aldehyde Is too short, as In 14, did not exhibit efficient crosslinking. They also showed significant discoloration, presumably due to Increased aldol condensation relative to 1, 2, or BNMA.

Performance vs Crosslinker Level. Table IV presents tensile and swell Index results on a series of approximately 0 C Tg VAE emulsion copolymers. ABDA containing copolymers had fair swell Index values which deteriorated rapidly as ABDA levels declined, but showed slow declines In wet tensile performance with reduced levels. Possible reasons for this are discussed below. 

Other important chemical and physical tests performed to characterize coal include (I) Heating value (Btu content) (2) sulfur forms (31 ash fusibility temperatures (4) ash analysis (5) trace elements (6) free swelling index and (7) hardgrove grindability. 

Some of the most common methods to evaluate the suitability of a coal or coal blend for coke production are the free-swelling index test, Gray-King assay, Roga assay, various dilatometer tests, and Gieseler plastometer test. In addition, research using larger amount of coal sample is also performed by means of a pilot coke oven. 

In Project 4, the consolidation of fine soils is studied. As the oedometer tests are long and the number of test rigs available is limited, typically students use results from previously performed tests, without carrying them on their own. With those results a series of parameters has to be determined (compression index, swelling index, consolidation coefficient, overconsolidation ratio, etc.). The preparation of the spreadsheets includes the analytical and graphical determination, within the spreadsheet, of the mentioned quantities. Later, this information is used to study the consolidation process in a realistic (field) problem, by... 

In this test, water was first imbibed by a specimen of Kunigel VI that was constrained from movement at both ends, allowing the developed swelling pressure to reach a constant value. Next, a short-term test sequence of consolidation and unloading was performed to obtain the compression index A and the swelling index k. After this procedure, a constant stress was applied and the displacement was measured. The procedure employed in the experiments is outlined in Table 10.1 and a schematic diagram of the apparatus is shown in Fig. 10.1. 

The pellets physical property and metallurgical performances are shown in Table II which were tested by the relevant standard of COREX. Pellets with 2670 N pellets compressive strength have a porosity of 22.27%. The reduction degradation and reduction swelling indexes are low. The softening temperature is 965"C. Thus it can be seen that self-fluxed pellets can meet the requirement of raw materials for COREX. 

Other work that has looked into the performance of recovered black includes a Malaysian investigation [17] that evaluated the performance of the black in NR and nitrile rubber (NBR) formulations. The curing characteristics, physical properties and swelling index of the rubber compounds were investigated and compared with those of rubber compounds containing virgin black. In the case of the NBR compounds, blends of the recovered black with virgin black were also prepared and tested. 

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