Makars Raimonds, Rizikovs Janis, Godina Daniela, Paze Aigars, Merijs-Meri Remo
Latvian State Institute of Wood Chemistry, Dzerbenes iela 27, LV-1006 Riga, Latvia.
PolyLabs SIA, Mukusalas iela 46, LV-1004 Riga, Latvia.
Polymers (Basel). 2022 Jun 6;14(11):2304. doi: 10.3390/polym14112304.
The birch ( spp.) outer bark is a valuable product rich in betulin. After removal of betulin extractives, suberin containing tissues are left. Suberin is a biopolyester built from α,ω-bifunctional fatty acids (suberinic acids), which after depolymerization together with lignocarbohydrate complex is a potential adhesive as a side-stream product (residue) from obtaining suberinic acids for polyol synthesis. In this work, we studied the utilization possibilities in particleboards of the said residue obtained by depolymerization in four different solvents (methanol, ethanol, isopropanol and 1-butanol). The adhesives were characterised by chemical (acid number, solubility in tetrahydrofuran, epoxy and ash content) and instrumental analytical methods (SEC-RID, DSC, TGA and FTIR). Based on the results of mechanical characteristics, ethanol was chosen as the most suitable depolymerization medium. The optimal hot-pressing parameters for particleboards were determined using the design of experiments approach: adhesive content 20 wt%; hot-pressing temperature 248 °C, and hot-pressing time 6.55 min.
桦木（桦木属）的外层树皮是一种富含桦木醇的珍贵产品。去除桦木醇提取物后，留下了含有木栓质的组织。木栓质是一种由α,ω-双功能脂肪酸（木栓质酸）构建的生物聚酯，其在解聚后与木质碳水化合物复合物一起作为从获得用于多元醇合成的木栓质酸的副产品（残渣）是一种潜在的粘合剂。在这项工作中，我们研究了在四种不同溶剂（甲醇、乙醇、异丙醇和正丁醇）中解聚获得的上述残渣在刨花板中的利用可能性。通过化学方法（酸值、在四氢呋喃中的溶解度、环氧和灰分含量）和仪器分析方法（尺寸排阻色谱-示差折光检测法、差示扫描量热法、热重分析法和傅里叶变换红外光谱法）对粘合剂进行了表征。基于力学性能结果，选择乙醇作为最合适的解聚介质。使用实验设计方法确定了刨花板的最佳热压参数：粘合剂含量20 wt%；热压温度248℃，热压时间6.55分钟。
