PBT/PC Blends Compatibilized and Toughened via Copolymers in Situ Formed by MgO-Catalyzed Transesterification

Abstract

Due to the limited toughening effect of BPM520 (a commercial acrylic-based core−shell structure impact modifier) on poly(butylene terephthalate) (PBT)/polycarbonate (PC) blends, magnesium oxide (MgO) was used as a transesterification catalyst, and BPM520 as a toughening agent to prepare PBT/PC blends by extrusion and injection molding. The structures and comprehensive properties of PBT/PC blends were investigated. Results of thermogravimetric analysis, Fourier transform infrared analysis, differential scanning calorimetry, and rheological measurements showed that transesterification reactions occurred among PBT, PC, and BPM520. As a result, the impact property of the blends was improved significantly, and only 5 wt % of BPM520 was needed to make the PBT/PC blend possess excellent toughness in the presence of MgO, which suggested a very efficient toughening approach for PBT/PC blends.

Tuning the compatibility to achieve toughened biobased poly(lactic acid)/poly(butylene terephthalate) blends

“…Such observations were widely reported by other researchers aer incorporation of EBA-GMA modier to toughen the polymer. 8,10,68 Conversely, the blends toughness was improved. The elongation at break and the notched impact strength of the PLA/PBT blends showed an increasing trend with the increasing content of EBA-GMA (Fig.…”

Transparent PC/PMMA Blends Via Reactive Compatibilization in a Twin-Screw Extruder

“…Reactive compatibilization by catalytic transesterification is a common strategy in blends manufacturing and has already been described repeatedly for PC blends. For example, it has been applied to PC blends such as PC/PBT [23][24][25] and PC/PET [26][27][28]. For PC/PMMA blends, prior art using this methodology is already existing as well.…”

Preparation and properties of enhanced nanocomposites based on PLA/PC blends reinforced with silica nanoparticles

“…20 While, cobalt (II) acetylacetonate catalyzes the exchange reactions between carboxyl groups on the PLA or PC chains and hydroxyl (OH) groups on the head of PLA or PC chains or on the silica surface. 16,17 These reactions decrease the PLA crystallinity, which is evident in the broader XRD spectrum of PLA/PC/Silica/Co sample. Worth mentioning, the best results were observed for the PLA/PC/Silica/Co sample which showed less peak number with the most broadening.…”

“…In fact, both polymers have ─COO─ bonds in their backbones (see Scheme 1) and can undergo exchange reactions at elevated temperatures in sample preparation step. 16,17 These reactions can prevent structural organization of PLA, which limits its crystallization. In the XRD spectrum of PLA/PC/Silica (ie, the sample containing PLA, PC, and silica nanoparticles), the main characteristic broad band of silica centered at 2θ = 23°overlapped 18 with PLA peaks.…”