Research Forest Institute (Institut de recherche sur les forêts-IRF), University of Québec in Abitibi-Témiscamingue (UQAT), 445 Boul. de l'Université, Rouyn-Noranda J9X 5E4, QC, Canada; UniLaSalle, Unité de recherche Transformations & Agro-Ressources, VAM2IN (EA 7519 UniLaSalle-Université d'Artois), Mont Saint Aignan, France.
Research Forest Institute (Institut de recherche sur les forêts-IRF), University of Québec in Abitibi-Témiscamingue (UQAT), 445 Boul. de l'Université, Rouyn-Noranda J9X 5E4, QC, Canada.
Int J Biol Macromol. 2023 Dec 31;253(Pt 3):126918. doi: 10.1016/j.ijbiomac.2023.126918. Epub 2023 Sep 17.
Microcrystalline cellulose (MCC-30 wt%) was extruded with a blend of polybutylene succinate (PBS) and cellulose acetate (CA-20 wt%) to produce two grades of binary (PBS/CA, PBS/MCC) and ternary (PBS/CA/MCC) specimens by injection into a mold previously thermostated at 22 °C and 78 °C. The structure-property relationships of neat PBS (n-PBS) and PBS-based blends were investigated by Fourier transform infrared (FTIR) spectroscopy, diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, scanning electron microscopy (SEM), rheology, differential scanning calorimetry (DSC), thermogravimetry, and mechanical (tensile, bending) tests. FTIR/DRIFT outcomes revealed physical interactions between the ingredients through hydrogen bonds. Rheology and SEM evidenced the presence of entanglements and micro-voids absent in n-PBS. Non-isothermal DSC showed that 22 °C-molded formulations displayed crystalline degrees higher than 78 °C-specimens, except for PBS/MCC. DSC-isothermal analysis showed a hindrance effect of CA on PBS/CA crystallinity and a nucleating impact of MCC on PBS/MCC. Tensile and bending moduli increased for both material grades while the elongation at break decreased. Entanglements and micro-voids had detrimental effects on stress levels because the maximum tensile strength decreased when each or both biofillers were added to PBS. These structural configurations were beneficial for bending strengths since all blends' stiffness relatively increased regardless of material grade.
微晶纤维素（MCC-30wt%）与聚丁二酸丁二醇酯（PBS）和醋酸纤维素（CA-20wt%）共混物进行挤出，通过注射到先前在 22°C 和 78°C 下恒温的模具中，生产出两种等级的二元（PBS/CA、PBS/MCC）和三元（PBS/CA/MCC）试样。通过傅里叶变换红外（FTIR）光谱、漫反射红外傅里叶变换（DRIFT）光谱、扫描电子显微镜（SEM）、流变学、差示扫描量热法（DSC）、热重分析和机械（拉伸、弯曲）测试研究了纯 PBS（n-PBS）和 PBS 基共混物的结构-性能关系。FTIR/DRIFT 结果表明通过氢键存在成分之间的物理相互作用。流变学和 SEM 证明存在缠结和微空隙，而 n-PBS 中不存在这些。非等温 DSC 表明，22°C 模制配方的结晶度高于 78°C 试样，除了 PBS/MCC 外。DSC-等温分析表明 CA 对 PBS/CA 结晶度有阻碍作用，MCC 对 PBS/MCC 有成核作用。两种材料等级的拉伸和弯曲模量都增加，而断裂伸长率降低。缠结和微空隙对应力水平有不利影响，因为当每种或两种生物填料添加到 PBS 中时，最大拉伸强度降低。这些结构配置有利于弯曲强度，因为所有共混物的刚性都相对增加，而不管材料等级如何。
