Multi‐copolymerization retouch butadiene styrene block polymer resin for dual temperature change curing of wood‐based interface

Abstract

Carboxylated styrene‐butadiene latex (XSBL), attributed to its insufficient adhesion and poor water resistance, cannot be widely popularized in the adhesive industry. Herein, a novel XSBL‐based resin with high‐strength yet water‐resistant was reported, in which the butadiene macromolecular chains were grafted with acrylonitrile (AN) and acrylic acid‐2 hydroxyethyl ester (HEA) molecules, the crosslinking sites were esterified and expanded to construct a branched network structure, and the matrix was filled with nano‐SiO2 particles treated by blending silane coupling agents. We show that the new resin, having a dual curing mechanism at low and high temperatures, can be glued under different conditions. At room temperature, the sample group with a doping level of 1.33 wt% could achieve an overload shear strength of 3.17 MPa after curing, which is 233.7% higher than the XSBL; in the high temperature curing regime, the glue strength reached 1.21 MPa, much higher than the standard for the use of GB Class I plywood (≥0.7 MPa). The physicochemical properties meet the requirements for potential industrialization, for which the property–structure relation has been extensively explored. Further DSC and TG tests provide evidence for their wide application in the hot pressing process of man‐made plywood.

Hydrophobic Carbon Dots with Aggregation-Induced Emission for Multistage Anticounterfeiting

“…As shown in Figure 2a, the TEM images of U-CDs show a size distribution between 5 and 11 nm with an average diameter of about 8.2 nm. A highresolution TEM (HR-TEM) analysis reveals that the lattice spacing of 0.34 nm observed in U-CDs corresponds to the (002) plane of graphite, indicating the presence of a graphitelike structure (Figure 2b), 30 This finding is further supported by the XRD pattern (Figure 2b), which shows a prominent peak at around 26°, corresponding to the (002) crystal face of 2c, showing that the surface of U-CDs contains methylene (2823 and 2873 cm −1 ), 31 S−H (2654 cm −1 ), amide carbonyl (1679 cm −1 ), C�C (1461 cm −1 ), 32 C−N (1417 cm −1 ), 33 C−S (737 cm −1 ), S−S (553 cm −1 ), and aromatic C− NH groups (1260 cm −1 ). 34 In addition, the FT-IR spectra of urea and DTSA show that these raw materials contain hydroxyl groups (3011 cm −1 ) or amino groups (3452 cm −1 ).…”

“…According to the Raman spectrum shown in Figure S1, I G / I D = 4.39, indicating that it has good crystallinity and fewer defects. The FT-IR spectra of U-CDs are shown in Figure c, showing that the surface of U-CDs contains methylene (2823 and 2873 cm –1 ), S–H (2654 cm –1 ), amide carbonyl (1679 cm –1 ), CC (1461 cm –1 ), C–N (1417 cm –1 ), C–S (737 cm –1 ), S–S (553 cm –1 ), and aromatic C–NH groups (1260 cm –1 ) . In addition, the FT-IR spectra of urea and DTSA show that these raw materials contain hydroxyl groups (3011 cm –1 ) or amino groups (3452 cm –1 ).…”