Structure and properties of a compatible wood‐plastic composite prepared by using poly(butylene succinate)‐based polyurethane prepolymer

Abstract

Wood‐plastic composites (WPCs) are sustainable green material with extensive application prospects in both industry and daily life. So a more convenient, environmentally friendly and effective method is crucial. In this work, WPC was composed by 60 wt% poly(butylene succinate) (PBS) matrix, 10 wt% compatibilizer, and 30 wt% wood flour (WF) through extruder and injection machine. The effects of PBS diol‐based polyurethane prepolymer (PBSPUP) compatibilizer on the structure and properties of WPCs were investigated. Compared with the WF30P70 sample, the tensile strength and the elongation at break of WF30PU10P60 sample had an increase of 52.1% and 125.0%, respectively. And the equilibrium water absorption of WF30PU10P60 was reduced from 4.79% (WF30P70) to 3.57%, the flow properties of WF30PU10P60 were also improved at the same time. Apparently, the composites containing the poly(butylene succinate) diol‐based polyurethane prepolymer (PBSPUP) compatibilizer exhibited improved mechanical properties and thermal performance as shown by the results of scanning electron microscopy, differential scanning calorimetry, X‐ray diffraction, water absorption, rheological property analyses, and so on. Toward this end, the special PBSPUP interface structure played an important role in improving the properties of the WPC.

Preparation and Properties of Compatible Starch‐PCL Composites: Effects of the NCO Functionality in Compatibilizer

“…Compared to our previous gel permeation chromatography test, it can be concluded that the synthesis of PCLPU and TPUP was successful. The IR spectra of the different PCL‐CS composites are shown in Figure , it can be seen that apart from PS‐0, all the other composites (i.e., PSTI‐3, PSPU‐2, PSDI‐2, PSPI‐1, and PSTP‐0) exhibited a main peak with maximum absorbance of about 3480 cm −1 corresponding to the N─H of urethane moieties . Interestingly, the typical absorption peak of ─NCO (around 2270 cm −1 ) in PI, MDI, MTI, and PCLPU disappeared suggesting that the ─NCO groups were consumed during the formation of the urethane bond.…”

“…Synthesis of polycaprolactone diol based polyurethane pre‐polymer (PCLPU) has been reported in our earlier works . The specific reaction steps for preparing PCLPU and ─NCO‐terminated polyurethane pre‐polymer (TPUP) can be found in the Supporting Information.…”

“…Mechanical properties including the elongation at break ( є b ), tensile strength ( σ b ), and elasticity modulus ( E ) values were performed and measured by a universal test machine (GP‐TS 2000S, Shenzhen Gaopin testing equipment co. LTD, China) after 7 days of compression molding. The specific test method has been provided in the Supporting Information (please refer to our previous works) …”

Preparation and characterization of thermosetting wood flour composite material with high biomass content

“…To this end, water molecules can easily overcome the resistance to contact the hydroxyl group of WF, resulting in a higher water absorption rate. [21,23] For the WUF system, the abundant hydrophilic groups in the system make it easy to interact with water molecules, so the water absorption rate of WUF is naturally high, can verified by its contact angle result.…”

Continuous Blown Film Preparation of High Starch Content Composite Films with High Ultraviolet Aging Resistance and Excellent Mechanical Properties

“…The figure shows the FTIR spectra of starch/PBAT composite film doped with different content of lignin. As shown in Figure 1, the four groups of starch/PBAT composite materials all have an absorption peak at 1518 cm −1 , which is attributed to the presence of N-H in the urethane bond of the urethane [19]. Moreover, the absorption peaks at 1738 cm −1 and 1267 cm −1 are due to the stretching vibration of the C-O and C=O group pairs in the urethane [19,20].…”