期刊
POLYMERS
卷 13, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/polym13040612
关键词
bio-polyols; bio-based isocyanate; flexible polyurethane foams; prepolymer synthesis; thermal and mechanical properties
资金
- CARIPLO FOUNDATION [2017-0998]
Bio-polyols were prepared using an environmentally friendly, solvent-free method, with the presence of triethylamine as catalyst reducing side reactions. The experimental targets included a medium functionality value of around 3, hydroxyl number up to around 90 mg KOH/g, narrow polydispersity index, and relatively low molecular mass. Water blown polyurethane foams were produced from selected bio-polyols and an aliphatic partially bio-based isocyanate, showing the effect of the chemical nature of substituents in the polyol backbone on the PU properties.
Bio-polyols from epoxidized soybean and linseed oils and caprylic acid or 3-phenyl butyric acid were prepared using an environmentally friendly, solvent-free method evaluating the presence of triethylamine as catalyst. Side reactions, leading to a cross-linking structure with high density, were reduced, introducing the catalyst and properly tuning the reaction conditions. A medium functionality value of around 3 along with a hydroxyl number up to around 90 mg KOH/g, narrow polydispersity index, and relatively low molecular mass up to 2400 g/mol were the experimental targets. From selected bio-polyols and an aliphatic partially bio-based isocyanate, a series of water blown polyurethane (PU) foams was produced, estimating the effect of the chemical nature of substituents in the polyol backbone on the PU properties. The apparent density of the foams was in the range of 79-113 kg/m(3), with higher values for foams from the aromatic acid. Flexible polyurethane foams with open cell structure from bio-based polyols were obtained, with higher cavity size and lower pore sizes for foams from caprylic acid. The bio-based flexible PU foams showed comparable Young's moduli (14-18 kPa) and compression deflection values (4.6-5.5 kPa) and exhibited an almost complete recovery of their initial size.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据