Citation: Zhong-bin Xu a, b, Wei-wei Kong a, Ming-xing Zhou a, Mao Peng a. EFFECT OF SURFACE MODIFICATION OF MONTMORILLONITE ON THE PROPERTIES OF RIGID POLYURETHANE FOAM COMPOSITES[J]. Chinese Journal of Polymer Science, ;2010, 28(4): 615-624. doi: 10.1007/s10118-010-9111-0 shu

EFFECT OF SURFACE MODIFICATION OF MONTMORILLONITE ON THE PROPERTIES OF RIGID POLYURETHANE FOAM COMPOSITES

Received Date: 10 September 2009
Revised Date: 27 November 2009

This study investigated the influence of various organically modified montmorillonites (organoclays) on the structure and properties of rigid polyurethane foam (RPUF) nanocomposites. The organoclays were modified with cetyltrimethyl ammonium bromide (CTAB), methyl tallow bis(2-hydroxyethyl) quaternary ammonium chloride (MT2ETOH) and tris(hydroxymethyl)aminomethane (THMA) and denoted as CMMT, Cloisite 30B and OMMT, respectively. MT2ETOH and THMA contain hydroxyl groups, while THMA does not have long aliphatic tail in its molecule. X-ray diffraction and transmission electron microscopy show that OMMT and Cloisite 30B can be partially exfoliated in the RPUF nanocomposites because their intercalating agents MT2ETOH and THMA can react with isocyanate. However, CMMT modified with nonreactive CTAB is mainly intercalated in the RPUF matrices. At a relatively low filler content, the RPUF/CMMT composite foam has a higher specific compressive strength (the ratio of compressive strength against the apparent density of the foams), while at relatively high filler contents, RPUF/Cloisite 30B and RPUF/OMMT composites have higher specific compressive strengths, higher modulus and more uniform pore size than the RPUF/CMMT composite.
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