Journal
JOURNAL OF MOLECULAR MODELING
Volume 12, Issue 4, Pages 513-520Publisher
SPRINGER
DOI: 10.1007/s00894-005-0086-7
Keywords
polyamides; QSPR; DFT; BP artificial neural networks
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Quantitative structure -property relationships (QSPR) for glass translation temperatures (T (g)), density (rho) and indices of refraction (n) of the polyamides have been determined. All descriptors are calculated from molecular structures at the B3LYP/6-31G(d) level. These QSPR models are generated by two methods: multiple linear regression (MLR) and error back-propagation artificial neural networks (BPANN). The model obtained by MLR is used for the calculations of T (g) (R (training)=0.9074, SDtraining=22.4687, R (test)=0.8898, SDtest=23.2417), rho (R (training)=0.9474, SDtraining=0.0422, R (test)=0.8928, SD (test)=0.0422), n (R (training)=0.9298, SDtraining=0.0204, R (test)=0.9095, SDtest=0.0274). The model obtained by BPANN is used for the calculations of T (g) (R (training)=0.9273, SDtraining=14.8988, R (test)=0.8989, SDtest=16.4396), rho (R (training)=0.9523, SDtraining=0.0466, R (test)=0.9014, SDtest=0.0512), n (R (training)=0.9401, SDtraining=0.0131, R (test)=0.9445, SDtest=0.0179). These results demonstrate that the MLR and BPANN methods can be used to predict T-g, rho and n. The more accurate predicted results are obtained from BPANN.
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