The rates of reactions between two hydroxylated polybutadienes (R-45M and H-110) and 1,6-hexamethylene diisocyanate (HDI) have been studied in nitrobenzene solution in the temperature range from 30 to 60°C. An analytical method was used... more
The rates of reactions between two hydroxylated polybutadienes (R-45M and H-110) and 1,6-hexamethylene diisocyanate (HDI) have been studied in nitrobenzene solution in the temperature range from 30 to 60°C. An analytical method was used to follow the kinetics of the reactions. The second-order rate constants were calculated and it was concluded that the reactivities of the two-NCO groups in HDI are identical. The rate of the R-45M/HDI reaction is slightly higher and its activation energy is lower than that of the H-110/HDI reaction. The R-45M/HDI reaction is slower in nitrobenzene solution than in chlorobenzene solution.
Research Interests:
Research Interests:
Summary The rates of reactions between two hydroxylated polybutadienes (R-45M and H-110) and 1,6-hexamethylene diisocyanate (HDI) have been studied in nitrobenzene solution in the temperature range from 30 to 60°C. An analytical method... more
Summary The rates of reactions between two hydroxylated polybutadienes (R-45M and H-110) and 1,6-hexamethylene diisocyanate (HDI) have been studied in nitrobenzene solution in the temperature range from 30 to 60°C. An analytical method was used to follow the kinetics of the reactions. The second-order rate constants were calculated and it was concluded that the reactivities of the two-NCO groups in
Research Interests:
Research Interests:
Objective To test the reliability and validity of the Portuguese version of the Stroke Impact Scale 2.0 (SIS 2.0). Methods Two samples (N = 448 and N = 50) of stroke patients attending physical therapy were evaluated. The Portuguese... more
Objective To test the reliability and validity of the Portuguese version of the Stroke Impact Scale 2.0 (SIS 2.0). Methods Two samples (N = 448 and N = 50) of stroke patients attending physical therapy were evaluated. The Portuguese versions of the SIS 2.0 and Chedoke-McMaster Stroke Assessment (CMSA), and a set of individual patient characteristics were the measures used. Results Reliability was good with Cronbach’s alpha coefficients ranging from 0.83 to 0.96, and intraclass correlation coefficients (ICC) between 0.70 and 0.95 for the SIS 2.0 domains. Construct validity was supported by 6 predefined hypotheses involving expected correlations between SIS 2.0 domains, CMSA dimensions and age. An additional predefined hypothesis was also confirmed, with subjects without complications during hospitalization obtaining significantly higher scores in 7 of the 8 SIS 2.0 domains (P Conclusion The Portuguese SIS 2.0 evidenced suitable psychometric characteristics in terms of reliability and validity.
