Poly(3-hydroxybutyrate) Modified by Plasma and TEMPO-Oxidized Celluloses

Polymers

CelinaMaria Damian¹  Gheorghe Dinescu²  Sorin Vizireanu²  LaviniaGabriela Carpen²  AugustaRaluca Gabor³  SergiuAlexandru Stoian³  DenisMihaela Panaitescu³  Cristian-Andi Nicolae³  Roxana Trusca⁴ 

[1] Advanced Polymers Materials Group, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania;National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania;Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania;Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania;

关键词: cellulose;    plasma in liquids;    polyhydroxyalkanoate;    polymer composites;    thermal properties;    DMA;   

DOI  :  10.3390/polym12071510

来源: DOAJ

【 摘 要 】

Microcrystalline cellulose (MCC) was surface modified by two approaches, namely a plasma treatment in liquid using a Y-shaped tube for oxygen flow (MCC-P) and a TEMPO mediated oxidation (MCC-T). Both treatments led to the surface functionalization of cellulose as illustrated by FTIR and XPS results. However, TEMPO oxidation had a much stronger oxidizing effect, leading to a decrease of the thermal stability of MCC by 80 °C. Plasma and TEMPO modified celluloses were incorporated in a poly(3-hydroxybutyrate) (PHB) matrix and they influenced the morphology, thermal, and mechanical properties of the composites (PHB-MCC-P and PHB-MCC-T) differently. However, both treatments were efficient in improving the fiber–polymer interface and the mechanical properties, with an increase of the storage modulus of composites by 184% for PHB-MCC-P and 167% for PHB-MCC-T at room temperature. The highest increase of the mechanical properties was observed in the composite containing plasma modified cellulose although TEMPO oxidation induced a much stronger surface modification of cellulose. This was due to the adverse effect of more advanced degradation in this last case. The results showed that Y-shaped plasma jet oxidation of cellulose water suspensions is a simple and cheap treatment and a promising method of cellulose functionalization for PHB and other biopolymer reinforcements.

【 授权许可】

Unknown