Spherical Polybutylene Terephthalate (PBT)—Polycarbonate (PC) Blend Particles by Mechanical Alloying and Thermal Rounding

Polymers

Dietmar Drummer¹  Lydia Lanzl¹  Jochen Schmidt²  MaximilianA. Dechet²  JuanS. Gómez Bonilla²  Wolfgang Peukert²  Andreas Bück² 

[1] Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany;Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany;

关键词: polybutylene terephthalate (PBT);    polycarbonate (PC);    polymer blend particles;    spheroidization;    additive manufacturing;    Raman microscopy;    SEM staining;    trans-esterification;   

DOI  :  10.3390/polym10121373

来源: DOAJ

【 摘 要 】

In this study, the feasibility of co-grinding and the subsequent thermal rounding to produce spherical polymer blend particles for selective laser sintering (SLS) is demonstrated for polybutylene terephthalate (PBT) and polycarbonate (PC). The polymers are jointly comminuted in a planetary ball mill, and the obtained product particles are rounded in a heated downer reactor. The size distribution of PBT⁻PC composite particles is characterized with laser diffraction particle sizing, while the shape and morphology are investigated via scanning electron microscopy (SEM). A thorough investigation and characterization of the polymer intermixing in single particles is achieved via staining techniques and Raman microscopy. Furthermore, polarized light microscopy on thin film cuts enables the visualization of polymer mixing inside the particles. Trans-esterification between PBT and PC during the process steps is investigated via vibrational spectroscopy and differential scanning calorimetry (DSC). In this way, a new process route for the production of novel polymer blend particle systems for SLS is developed and carefully analyzed.

【 授权许可】

Unknown