Synthesis of novel polycarbonate‐based thermoplastic polyurethane elastomers compatibilizers with octadecyl side chains and their application in PC/PP blends

Abstract

With the aim to improve the compatibility of polycarbonate (PC)/polypropylene (PP) blends, a novel aromatic polycarbonate diol (PCDL) was synthesized by the transesterification reaction, then a series of polycarbonate‐based thermoplastic polyurethane elastomers compatibilizers (TPU‐Gx) with octadecyl side chains were successfully prepared by introducing different content of PCDL and glyceryl monostearate (2,3‐Dihydroxypropyl octadecenoate; GMS). The structures of synthesized products were confirmed by Fourier transform infrared spectroscopy and Nuclear magnetic resonance hydrogen spectroscopy. Thermogravimetry results showed that all TPU‐Gx had good thermal stability. The effects of TPU‐Gx on the compatibilization of PC/PP blends were investigated in the aspect of morphology, mechanical, thermal, and rheological properties. The results showed that all TPU‐Gx could enhance the interfacial adhesion between PC/PP and improve the mechanical properties of PC/PP blends. Among them, the addition of TPU‐G1.5 containing 6.0 wt% PCDL and 1.5 wt% GMS made PC/PP/TPU‐G1.5 blends show the highest impact strength, which increased by 54.1% when compared with that of pure PC/PP blends.

Effect of compatibilizer on the structure and property of polycarbonate/polypropylene alloys

“…The FT-IR spectrum of sample was taken on a Fourier Notes: For better understanding the formulation and the further discussion, abbreviations are used as follows: matrix resin-g-compatibilizer, indicating the matrix resin was grafted by compatibilizer; the number after compatibilizer is the content of compatibilizer. For example, GMA 5.0, indicating the PC/PP (65/30) alloy grafted by PPM-g-GMA (5). The mass fraction of compatibilizer in formulation can be calculated by function as follows: Mass fraction ¼ Compatibilizer content 95þCompatibilizer content :…”

“…In the previous study, numerous modifications including reactive and additive compatibilization, have been introduced to further improve the properties of mobility, overcome its internal stress and also reduce the material cost. [3][4][5][6] It makes it possible for PC/PP alloy whose dielectric constant is relative low, applied in communication field. Compatibilizer plays an important role in preparing polymer alloy with high comprehensive performances, 7,8 and the technology of intruding the third phase to improve the compatibility of PC and PP has been widely studied.…”

“…Actually, no matter polyethylene (PE) or polypropylene (PP), as the two integral part of PO, the addition content can be added into PC is always small to achieve better performance in tensile strength and elongation at break. In the previous study, numerous modifications including reactive and additive compatibilization, have been introduced to further improve the properties of mobility, overcome its internal stress and also reduce the material cost 3–6 . It makes it possible for PC/PP alloy whose dielectric constant is relative low, applied in communication field.…”

Investigation of Crystallization, Morphology, and Mechanical Properties of Polypropylene/Polypropylene-Polyethylene Block Copolymer Blends

“…Adding a compatibilizer is the most common approach [ 6 , 7 , 8 , 9 , 10 ]. Compatibilizers typically include block or graft polymers, or compatibilizers with the same, or miscible, monomer units as the blend components [ 11 , 12 , 13 ]. Block copolymers can reduce the phase separation behavior, and may exhibit a homogeneous or microphase separation morphology, becoming commonly used compatibilizers [ 14 , 15 , 16 ].…”