Effect of Bamboo Fiber Length on Mechanical Properties, Crystallization Behavior, and in Vitro Degradation of Bamboo Fiber/Nanohydroxyapatite/Poly(lactic-co-glycolic) Composite

Abstract

Nanohydroxyapatite/poly­(lactic-co-glycolic) acid (n-HA/PLGA) composite was reinforced by bamboo fiber (BF), and the effects of BF of different lengths (≤1, 4–5, and 9–10 mm) on the mechanical properties, crystallization behavior, and in vitro degradation of the composite were investigated by an electromechanical universal tester, scanning electron microscopy, differential scanning calorimetry, polarized optical microscopy, and soaking in simulated body fluid (SBF) at 37 °C for 2, 4, 8, and 12 weeks, compared with the n-HA/PLGA composite. The results showed that BF (4–5 mm) had excellent comprehensive reinforce performance based on the best interface bonding and the best promotion crystallization effect. However, the in vitro degradation experiment revealed that the BF (≤1 mm) had the slightest tensile strength reduction percent, because the shortest size has difficulty escaping from the n-HA/PLGA matrix. The present work would provide important guidance significant for selecting the appropriate bamboo fiber length to prepare an ideal PLGA-based composite used for bone materials.

From nanocellulose to wood particles: A review of particle size vs. the properties of plastic composites reinforced with cellulose-based entities

“…In contrast, a thermal annealing treatment yielded substantial increases in modulus in all cases, with the best overall results for the unfilled PLA. Jiang et al (2018) compared the effects of bamboo-derived fibers of different length classes (<1 mm; 4 to 5 mm; 9 to 10 mm). Tensile and flexural strength and modulus were all increased with the addition of reinforcing fibers of any of the size ranges.…”

“…Among the synthetic water-soluble polymers, PVOH has been the most often studied for such purposes. Effects of particle Jiang et al (2018). Microfibrillated cellulose, having different attributes, was obtained from pure cellulose, holocellulose, and kraft pulp.…”

Biocompatibility improvement and controlled in vitro degradation of poly (lactic acid)‐b‐poly(lactide‐co‐caprolactone) by formation of highly oriented structure for orthopedic application

“…For isotropic PLA and PLA‐b‐PLCL, the cold crystallization peak gradually disappeared, while the melting peak shifted to lower temperature, and the melting heat enthalpy (Δ H m ) as well as crystallinity ( X c ) increased during degradation. The degradation of PLA and PLA‐b‐PLCL in PBS solution always occurred in the amorphous region, and some degradation products with low molecular weight detached from matrix, leading to the disappearance of cold crystallization peak and the increase of X c 42 . Besides, owing to the decrease of regularity of crystalline zone after degradation, the lamellae thickness and melting temperature declined.…”

“…The degradation of PLA and PLA-b-PLCL in PBS solution always occurred in the amorphous region, and some degradation products with low molecular weight detached from matrix, leading to the disappearance of cold crystallization peak and the increase of X c . 42 Besides, owing to the decrease of regularity of crystalline zone after degradation, the lamellae thickness and melting temperature declined. After two-stage…”

Surface Modification of Bamboo Fibers to Enhance the Interfacial Adhesion of Epoxy Resin-Based Composites Prepared by Resin Transfer Molding

“…As a prominent member of the NF family, bamboo has gained increasing research attention due to its high toughness and simple processing [23,24], making it a desirable candidate for fiber-reinforced resin composites [25,26]. However, similar to other NFs, bamboo fibers (BFs) are also rich in hydroxyl and polar groups, resulting in high moisture absorption, which negatively influences the interfacial bonding with hydrophobic matrix [27,28].…”