蓖麻油基聚氨酯预聚体改性酚醛泡沫的制备及表征

doi:10.3969/j.issn.0253-2417.2015.04.002

Abstract

Abstract: Castor oil-based polyurethane prepolymer(COPUP) was prepared through the reaction of castor oil(CTO) with 1,6-hexamethylene diisocyanate(HDI), then COPUP was used to modify phenolic foams(PFs). The structure of COPUP was confirmed by FT-IR and ¹H NMR. Morphological properties, mechanical properties and thermal stability of the copup-filled PFs were assessed by SEM, universal test and thermogravimetric analysis(TGA). The cell shapes of the COPUP-filled PFs were approximately symmetrical, but the cell sizes were larger than that of pristine PF. Especially, when the cell sizes of PF modified with 10 % COPUP, it became obviously heterogeneous and the bubbles collapse. Compared with that of pristine PFs, the flexural strength of PFs filled with 3%-7% COPUP increased about 21.05%-26.32%; and the corresponding specific flexural strength ranged from 5.90 to 6.17 (kN·m)/kg, which were significantly higher than that of the pristine PFs, 4.96(kN·m)/kg. The addition of COPUP caused the decrease of the thermal stability of PFs.

Key words: phenolic foams, polyurethane prepolymer, structure, mechanical properties, thermal stability

CLC Number:

TQ35

BO Cai-ying, HU Li-hong, ZHOU Jing, ZHOU Yong-hong. Preparation and Characterization of Phenolic Foams Modified by Castor Oil-based Polyurethane Prepolymer[J]. Chemistry and Industry of Forest Products, 2015, 35(4): 8-14.

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Preparation and Characterization of Phenolic Foams Modified by Castor Oil-based Polyurethane Prepolymer

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