Macromolecular Symposia最新文献

The energy absorption of bamboo mimicking flax fibre reinforced epoxy composite laminates is measured under impact conditions. Core–shell rubber nanoparticles are introduced and homogeneously distributed in the matrix for toughening purposes. Impact tests reveal that the absorbed energy and impact damage depend on the laminate lay-up, i.e. the local fibre concentration. The core–shell rubber nanoparticles greatly increase the absorbed impact energy while reducing the area of damage.

There is an urgent need for new generations of more functional biomedical devices in tissue engineering that can significantly improve patient health. The development of customised tissue alternatives to organ donation needs more research to ensure their quality, reliability, affordability, and sustainability. Biomaterials are promising substances that can be used for biomedical devices due to their properties’ similarity to the nature of body organs and tissues. Additive Manufacturing is a common technique for bio fabrication due to its precision and personalization to patient's needs. 3D bioprinting by using biomaterials offers Porosity and enough strength are among the most necessary requirements for the structure of biomedical devices, especially scaffolds. That's the reason for using emerging mathematically designed and optimised geometries like Triply Periodic Minimal Surfaces (TPMS) as a potential structure due to their adjustable mechanical properties and permeability. This review addresses the current progress in the field by providing a clear pathway for future research. This review faces this major health-related challenge by undertaking the advancements in numerical modelling for complex interactions of cells, extracellular matrix, and scaffold to facilitate tailoring cell differentiation and growth in engineered tissues.

The research is devoted to the elaboration of poly(butylene succinate) (PBS) based plastic formulation with improved processability, increased stiffness and strength, better barrier properties, as well as antimicrobial effect. To reach the aim, PBS and its copolymer are evaluated as potential matrices for thermoplastic composites. Organically modified nanoclay in the range of 0.5 wt.%–8 wt.% is used to improve stiffness, strength and rheological behaviour of the nanocomposites. For extended applicability, different antimicrobial chitosan additives are used in the concentration range from 3 to 10 wt.%. The composition of the developed PBS hybrid composites is designed with a projection not to exceed the total filler content of 20 wt.%, thus maintaining its processability by a number of thermoplastics processing methods. Laboratory-scale melt compounding technology of the designed PBS hybrid composites has been developed, and optimal processing conditions have been determined based on rheological investigations. Particular attention has been addressed to the evaluation of the addition of the antimicrobial chitosan additive to the melt processing behaviour and mechanical performance of the developed hybrid composites. It has been determined that although the processability window of the developed PBS hybrid composites is decreased by the chitosan additive, it demonstrates a certain synergetic reinforcing effect together with nanoclay.

Polyethylene is one of the most widely used and versatile polymers, and recycling the large amount of waste generated each year is essential for achieving a circular economy. This study focuses on a high-density polyethylene (HDPE) obtained from a previous blow molding process. The material, neat and blended with linear low-density polyethylene (LLDPE), is reground and extruded into filament before being 3D printed through fused deposition modeling (FDM) technology. The investigated blends are tested for tensile properties according to ASTM D3039 standard, showing an isotropic behavior. Additionally, thermal analysis reveals that blending with LLDPE reduces the degree of crystallinity, which improves printability.