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In this study, ultrafine bamboo‐char (BC) was introduced into poly(lactic acid) (PLA) matrix to improve mechanical and thermal properties of PLA based biodegradable composites. PLA/BC biocomposites were fabricated with different BC contents by weight. Uniform dispersion of BC in the PLA matrix and good interaction via physical and chemical interfacial interlocks were achieved. The maximum tensile strength and tensile modulus values of 14.03 MPa and 557.74 MPa were obtained when 30% BC was used. Impact strength of the biocomposite with 30% BC was increased by 160%, compared to that of pure PLA. DSC analysis illustrated that PLA/BC biocomposites had a better thermal property. Crystallization temperature decreased and maximal crystallinity of 30.30% was observed with 30% BC load. We did not notice significant thermal degradation differences between biocomposites with different BC loadings from TGA. Better water resistance was obtained with the addition of BC. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43425.

In this study, ultrafine bamboo-char (UFBC) with different particle size was introduced into polypropylene (PP)/bamboo particle (BP) composites to improve the mechanical, thermal, and moisture resistant properties. PP/BP/UFBC ternary composites of different weight ratio were fabricated by melt blending and hot compression molding. Results showed that with UFBC content increasing, mechanical properties of composites gradually increased, and the good tensile strength of 29.12MPa and 34.15MPa was obtained when the ratio was 70/5/25 and 70/0/30, respectively, which improved by 141% and 182% than that of pure PP. Further, especially for finer UFBC, there was an obvious enhancement in flexural strength from 33.71 MPa to 54.14 MPa corresponding to the ratio of 70/20/10 to 70/ 5/25. The improvement related to matrix-filler adhesion was also demonstrated by SEM. Crystallization temperature and melting temperature exhibited 8.78C and 4.68C higher than PP/BP composites, respectively. Moisture resistance was significantly improved when over 20 wt% UFBC was added. POLYM. COMPOS., 00:000-000,

Bamboo particles (BPs) and ultrafine bamboo‐char (UFBC) were introduced into polypropylene (PP) biocomposites by melt‐blending and injection molding, to improve the mechanical and thermal properties of PP matrix. The maximum tensile strength of 30.59 MPa was obtained when the ratio was 70/25/5, which was improved by 30% than that of pure PP. The maximum tensile modulus of 460.13 MPa was achieved when the ratio was 70/20/10, which was enhanced by 109%, 35% and 24% than that of neat PP, PP/BP (70/30), and PP/UFBC (70/30), respectively. The mechanical and thermal properties of the biocomposites were improved through adding UFBC. Improvement evidences on interfacial interaction and elemental distribution were observed by scanning electron microscope and energy dispersive spectrum analysis. The maximum melting temperature of 166.6°C was achieved that was increased 5.9°C than neat PP. Crystallization temperature was significantly improved with the increasing of UFBC and BP loadings. POLYM. COMPOS., 39:E640–E646, 2018. © 2018 Society of Plastics Engineers

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