Polymers process measurement systems analysis

Apparatus. Since all the polymer modification reactions presented in this paper involved gas consumption, an automated gas consumption measuring system was designed, fabricated and used to keep constant pressure and record continuously the consumption of gas in a batch type laboratory scale reactor. Process control, data acquisition, and analysis was carried out using a personal computer (IBM) and an interface device (Lab-master, Tecmar Inc.). 

Brouwer T, Todd DB et al (2002) Flow characteristics of screws and special mixing enhancers in a co-rotating twin screw extruder. Int Polym Process 17(l) 26-32 Carpenter J, Katayama D et al (2009) Measurement of Tg in lyophilized protein and protein exdpient mixtures by dynamic mechanical analysis. J Therm Anal Calorim 95 881-884 Chiang P-C, Ran Y et al (2012) Evaluation of drug load and polymer by using a 96-well plate vacuum dry system for amorphous solid dispersion drug delivery. AAPS Pharm Sci Tech 13(2) 713-722 Chokshi RJ, Sandhu HK et al (2005) Characterization of physico-mechanical properties of in-domethadn and polymers to assess their suitability for hot-melt extrusion process as a means to manufacture sohd dispersion/solution. J Pharm Sci 94(11) 2463-2474... 

The objective of this review is to characterize the excimer formation and energy migration processes in aryl vinyl polymers sufficiently well that the excimer probe may be used quantitatively to study polymer structure. One such area of application in which some measure of success has already been achieved is in the analysis of the thermodynamics of multicomponent systems and the kinetics of phase separation. In the future, it is likely that the technique will also prove fruitful in the study of structural order in liquid crystalline polymers. 

The general features of the D vs. Cj relations for amorphous polymer-solvent systems slightly above or below Tg° are not fully elucidated. This is mainly due to the fact that, as will be explained in the next section, the sorption processes in glassy polymers are not Fickian and hence the methods for the determination of D (cj) presented in the previous section can no longer be applied. In principle, D values of such systems could be determined from steady-state permeation measurements, but Kishimoto (unpublished) has shown that the analysis of permeation data on glassy systems is complicated by factors which are not yet fully resolved. 

The data are at present recorded on video tape for later digitization and processing. The scintillator screen, deposited on a fiber optics face plate is either ZnS(Ag) or Gd S 0(Tb). A spatial resolution of 0,5 mm FWHM has been measured. The system has been used in diffraction measurements of polymer samples and in protein crystallography as well. At present a quantitative analysis of the collected data is in progress. 

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