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Response surface regression of some polyurethane filled with modified cellulose

S. VLAD1,* , C. CIOBANU1, D. MACOCINSCHI1, D. FILIP1, A. NISTOR1, L. M. GRADINARU1, I. SPIRIDON1

Affiliation

  1. “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, 700487, Iasi, Romania

Abstract

The work consists of preparing some polyurethane filled with modified cellulose, and the evaluation of the response surface regression, using an experimental design. Optimization of the synthesis was studied based upon a design matrix with 13 experiences and a forward stepwise regression procedure was engaged to realize a statistically significant regression equation. This work intends to establish a series of products with increased mechanical and wettability properties. The influence of the amount of hydroxypropyl cellulose (HPC) and respectively hydroxylethyl cellulose (HEC), used as renewable resources, versus mechanical and wettability properties of the ensued polyurethanes was studied. Therefore, we conducted an optimization study using an experimental data matrix which gives the following general regression equation: Yi= bo + ik=∑1biXi + ∑=ki 1biiXi2+ i j <∑ bijXiXj (1); where: Xi, Xj – the independent variable: HPC and HEC amount; Yi, - the dependent variable: the value of the measured property (mechanical tests, Young’s modulus and wettability); bo, bii, bij - regression coefficients. Tensile strength and wettability values were performed on an Instron apparatus and respectively Sigma 700 tensiometer. The interaction between the experimental evaluation of algorithm behaviour and the theoretical analysis of algorithm performances plays an important role in our research. Comparing the own experimental and theoretical data on the basis of these equations, a good agreement resulted. This creates the possibilities to select the samples with pre-established and useful properties..

Keywords

Nonlinear regression, Optimization, Polyurethanes, Renewable resources.

Submitted at: May 29, 2009
Accepted at: June 28, 2009

Citation

S. VLAD, C. CIOBANU, D. MACOCINSCHI, D. FILIP, A. NISTOR, L. M. GRADINARU, I. SPIRIDON, Response surface regression of some polyurethane filled with modified cellulose, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 6, pp. 907-913 (2009)