Preparation of laminated safety glass based on high strength polyurethane film by solution annealing

Abstract

Compared with the traditional polyvinyl butyral (PVB) laminated glass, the polyurethane (PU) based laminated glass has the advantages of higher impact strength and longer service life. Thus, aromatic polyurethane films have attracted more attentions in recent years due to their high light transmittance, adhesion and functionality. In this paper, the tensile strength of polyurethane films based on bis(4‐isocyanatocyclohexyl)‐methane (HMDI) have been increased from 27 to 51 MPa and their elongation at break have been increased from 330% to 525% after solvent annealing in toluene. It is attributed to molecular segments with high crystallization and hydrogen bond formation of PU, which are confirmed by FT‐IR and XRD characterization. Based on this, laminated glasses with higher impact strength based on the thermoplastic polyurethane films are constructed successfully.

Study on the effect of chain extenders on aliphatic polyurethane and its application

“…25 The main structures of PU are amino group ( NH) stretching at around 3300 cm À1 , the carbonyl (C O) stretching at 1600-1800 cm À1 , of which, the urea carbonyl structure in PUurea (PU-U) is at around 1640 cm À1 , the methylene ( CH 2 ) signals of PTMG at 2940 and 2856 cm À1 , and the ether bond (C O C) at 1110 cm À1 (Figure 1). 26 The proton donors ( NH) and the proton acceptors (C O) are widely found in hard segments of PUs, contributing to the formation of numerous hydrogen bonding. In Figure S1, the allophanyl (C O) exhibits the ordered hydrogen bonds (I: 1630-1649 cm À1 ), disordered hydrogen bonds (II-III: 1650-1669 cm À1 ), free (IV: 1670-1689 cm À1 ) observe after peak fitting with a Gauss-Lorentz curve from 1800 to 1600 cm À1 in the Figure 1.…”

“…The main structures of PU are amino group (NH) stretching at around 3300 cm −1 , the carbonyl (CO) stretching at 1600–1800 cm −1 , of which, the urea carbonyl structure in PU‐urea (PU‐U) is at around 1640 cm −1 , the methylene (CH 2 ) signals of PTMG at 2940 and 2856 cm −1 , and the ether bond (COC) at 1110 cm −1 (Figure 1). 26 …”

High-Strength Polyurethane Composite Film Reinforced by Cellulose Nanocrystals

“…The balance of mechanical strength, toughness, and bonding strength is the key to elastomers as laminated glass intermediate films. Some methods have been developed in response to these problems. − For example, a simple and effective method to obtain modified TPU films by silane coupling agent (SCA) treatment was reported . Hydrogen bonds were formed between the silicon hydroxyl groups generated by the hydrolysis of the SCA.…”

Strength Enhancement of Aliphatic Polyurethane Film by Solution Annealing

“…It has been considered that the polymer morphology and molecular motion can be controlled by solvent annealing, which can be used in polymer solar cells, thin-film transistors, and so on. − The crystallization and orientation behavior of polymers can be induced and controlled by solvent annealing. , Therefore, if the strength of polyurethane can be improved through a solvent annealing process, it will definitely promote the high-performance and industrialization process of thermoplastic polyurethane.…”