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Influence of the microcrystalline cellulose dispersion method on the structure and properties of rigid polyurethane foam composites

Węgrzyk Grzegorz, Grzęda Dominik, Leszczyńska Milena, Gloc Michał, Ryszkowska Joanna

Advances in Materials Science

2023

Vol. 23, nr 4(78)

5--27

This paper investigates the reinforcement of rigid polyurethane foams with microcrystalline cellulose to improve their mechanical and thermal properties. In this work, microcrystalline cellulose was added to polyol and was dispersed using two methods: calendering and ultrasounds. As a result of the study, it was found that the addition of micro cellulose to the polyol mixture used for the synthesis of polyurethane foam changes the properties of the final product. A crucial aspect is how it is added to the mixture. When adding microcrystalline cellulose particles, better results were obtained for particles dispersed using ultrasound. The most beneficial changes were obtained for the sample with 2php cellulose. The most significant reduction in average pore size was shown, which has a beneficial effect on the insulating properties of polyurethane foam. In addition, an increase in mechanical properties was also noted. Both properties are highly desirable in many applications.

Porous polyurethane plastics synthetized using bio-polyols from renewable raw materials

Prociak A., Kurańska M., Malewska E.

Polimery

2017

T. 62, nr 5

353--363

A literature review and own investigations have been a base for presenting various methods of the synthesis of bio-polyols from renewable raw materials as well as their potential applications in the formulations of flexible and rigid polyurethane foams (Table 1). A characteristics of selected bio-polyols (Table 2) and their effect on foaming process of different polyurethane compositions are shown (Fig. 1, Table 3). Examples of the influence of selected bio-polyols on cell structures and physical and mechanical properties of both flexible (Fig. 2) and rigid (Table 4) foams are also presented.

Na podstawie przeglądu literatury i badań własnych omówiono różne metody wytwarzania bio-polioli z surowców odnawialnych oraz możliwości ich zastosowania w syntezie elastycznych isztywnych pianek poliuretanowych (tabela 1). Zaprezentowano charakterystykę wybranych bio-polioli (tabela 2) oraz ich wpływ na przebieg procesu spieniania różnych kompozycji poliuretanowych (rys.1, tabela 3). Podano przykłady wpływu wybranych bio-polioli na strukturę komórkową i właściwości fizyczne i mechaniczne modyfikowanych pianek elastycznych (rys. 2) i sztywnych (tabela 4).