Synergized high‐load bearing bone replacement composite from poly(lactic acid) reinforced with hydroxyapatite/glass fiber hybrid filler—Mechanical and dynamic mechanical properties

This work reports on the effect of expandable graphite (EG) on the morphology, thermal and dynamic mechanical properties of flame retardant poly(lactic acid) (PLA)/EG composites. The composites were prepared by melt-mixing and their structure, morphology, melting and crystallization behaviour, as well as their dynamic mechanical properties, were investigated. It was found that graphite layers still existed in an aggregate structure with poor filler dispersion resulting in a lack of interfacial adhesion between EG and the PLA matrix. The presence of EG did not favour the crystallization of PLA, increased the glass transition temperature and showed a reduction in the crystallinity of the composites. The composites with higher filler contents showed enhanced storage and loss moduli. The glass transition temperatures from the loss modulus and damping factor curves varied inconsistently with EG content. The use of commercial EG as filler in PLA can preserve the thermal properties of injection moulding grade Cereplast PLA.

Download Full-text

Morphology, thermal, and dynamic mechanical properties of poly(lactic acid)/sisal whisker nanocomposites

Polymer Composites ◽

10.1002/pc.22236 ◽

2012 ◽

Vol 33 (6) ◽

pp. 1025-1032 ◽

Cited By ~ 40

Author(s):

E.E.M. Ahmad ◽

A.S. Luyt

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Dynamic Mechanical Properties ◽

Poly Lactic Acid ◽

Dynamic Mechanical

Download Full-text

Investigations on jute fibre-reinforced polyester composites: Effect of alkali treatment and poly(lactic acid) coating

Journal of Industrial Textiles ◽

10.1177/1528083718804203 ◽

2018 ◽

Vol 49 (7) ◽

pp. 923-942 ◽

Cited By ~ 9

Author(s):

MK Gupta

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Loss Modulus ◽

Alkali Treatment ◽

Dynamic Mechanical Properties ◽

Poly Lactic Acid ◽

Jute Fibre ◽

Static Compression ◽

Dynamic Mechanical ◽

Polyester Composites

The aim of the present investigation is to overcome the limitations of jute fibre-reinforced polyester composite. The jute fibre-reinforced polyester composites were prepared by hand lay-up technique followed by static compression using constant fibres length 15 mm and constant fibres loading 16 wt.%. In the present work, treated jute fibres consisted of alkali treated, poly(lactic acid)-coated and alkali-treated coated with poly(lactic acid). Mechanical properties in terms of tensile, flexural and impact test, and dynamic mechanical properties in terms of storage modulus [Formula: see text], loss modulus [Formula: see text], damping [Formula: see text] and glass transition temperature [Formula: see text]of prepared composites were studied. In addition, water absorption properties in terms of percentage of water uptake and sorption, diffusion and permeability coefficient were also studied. In addition, morphological analysis of untreated and treated jute fibres and its polyester based composites was also carried out using scanning electron microscope. The results suggested that the limitations of jute fibre-reinforced polyester composites were significantly reduced after the treatment of fibres. The composite with alkali-treated jute fibres coated with poly(lactic acid) exhibited the best performance in terms of improvement in mechanical, dynamic mechanical and water resistance properties. The results obtained from present study show a successful attempt of a novel treatment.

Download Full-text