木质素基聚氨酯预聚体改性酚醛泡沫的制备及表征

doi:10.3969/j.issn.0253-2417.2017.01.008

Abstract

Abstract: Lignin was liquefied with polyethylene glycol (PEG) in a solvent-free system and then directly used with suitable PEG as a co-monomer and co-solvent to prepare liquefied lignins (LLs)-based polyurethane prepolymers (LLPUPs). The structural changes that lignin undergoes after liquefaction were studied by Fourier transform infrared spectroscopy (FT-IR), the hydroxyl number of LL is 177-286 mg/g and decreases with the increasing of molecular mass of PEG. The structures of LLPUPs were characterized by FT-IR. Then, phenolic foams (PFs) modified with different contents of LLPUPs were prepared. Morphological properties, mechanical properties and thermal stability of PFs were assessed by scanning electron microscopy (SEM), universal test and thermogravimetric analysis (TGA). Results show that uniform cells can be prepared by incorporating 9% LLPUP1 and LLPUP2 into the network. The addition of LLPUPs into foam formulations improves the compressive strength and specific compressive strength of PFs, and the highest specific compressive strength is obtained by adding 9% LLPUP2 (4.44(Pa·m³)/g). Appropriate levels of LLPUPs could improve the specific flexural strength of PFs, and the highest specific flexural strength is obtained by adding 9% LLPUP1 (8.23(Pa·m³)/g). PFs modified with different contents of LLPUPs show similar thermal resistance as pristine foam.

Key words: liquefied lignin, phenolic foams, polyurethane prepolymer, characterization

CLC Number:

TQ35

BO Caiying, HU Lihong, YANG Xiaohui, ZHENG Minrui, ZHANG Meng, ZHOU Yonghong. Preparation and Characterization of Phenolic Foams Modified by Lignin-based Polyurethane Prepolymers[J]. Chemistry and Industry of Forest Products, 2017, 37(1): 63-72.

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Preparation and Characterization of Phenolic Foams Modified by Lignin-based Polyurethane Prepolymers

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