The study investigates the effects of aggressive factors environments commonly found in industrial environments on the elastomeric material TPU 95 A, which is integrated into a multitude of soft robotics applications. Specimens made of TPU 95 A were subjected to aggressive liquid media - cooling oil, distilled water, and ultraviolet radiation (UV-C) to evaluate changes in their mechanical and elastic properties following uniaxial tensile tests. The research, carried out using additive manufacturing technology, highlights the importance of monitoring how the external factors impact elastic and mechanical characteristics of TPU 95 A material. The results obtained after the experimental tests proves to us that the aggressive media analyzed had a greater or lesser influence on the material. By uniaxial tensile tests, it was found that the liquid absorption had a very important impact on the tensile strength of the material. For example, at 1.02% absorption in distilled water, the maximum value of the ultimate strain decreased by 0.257 mm/mm, and at 3.06% absorption in cooling oil, the maximum value of the strain decreased by 0.672 mm/mm.

In this study, fan blades and thermosetting polyurethane foam were mechanically recycled, and glass fibers of different lengths and polyurethane powders of different particle sizes were separated by crushing and screening.The recycled materials with different particle sizes and mass fractions were selected and homogeneously mixed with the matrix thermoplastic polypropylene powder, and nine groups of different composite insulation boards were prepared using hot press molding method.The tensile strength, flexural strength and thermal conductivity of different insulation boards were analyzed.The results show that when the glass fiber mass fraction is 20%, the mechanical properties can reach the maximum value, and its tensile strength and bending strength are 7.196 MPa and 13.2 MPa, respectively.The thermal conductivity can reach the minimum value of 0.091 W/(mK) when the glass fiber mass fraction is 10%.In this study, polyurethane and glass fibers were recycled at the same time to obtain insulation boards with good mechanical strength and thermal insulation properties, which provides new possibilities for the development of insulation materials.

Flexible and acrylic resins are used as denture bases.Acrylic resins derived from polymethyl methacrylate are the conventional approach.Flexible thermoplastic resins are the alternative, and of these, polyamides with low flexibility and ethylene propylene resins are often used in current practice.The biocompatibility, flexibility, non-allergenic properties, and ease of denture insertion all highlight the suitability of these materials.This study aims to evaluate the behavior of low flexibility polyamide, ethylene propylene resin, and polymethyl methacrylate resin, used as partial denture bases, by monitoring the specific parameters obtained.The evaluation of the behavior of the materials was carried out by clinical examination.Additionally, a questionnaire was used.The results with both flexible resins are almost similar and superior to conventional resins, in partially edentulous patients, in difficult clinical situations, on undercut prosthetic areas, and in extended edentulous, tilted teeth, or when the patient has a limited mouth opening.The prognosis over time with polyamides with low flexibility and ethylene propylene resins is more advantageous than with classic acrylic resins.

This paper was created within the EU Horizon project -RECICLARM -which conducted waste management research with the purpose of recycling up to 70% of Europe's waste [1].Our investigation focused on developing an algorithm capable of accurately classifying materials including plastic onces in categories of interest with the help of machine learning.Various types of materials and input variables have been documented and considered while prototyping and testing the intelligent classification algorithm, which resulted in a precise and efficient solution.

The paper presents the results of experimental research conducted in the laboratory with the aim of obtaining new composite materials used for automotive brake pads. The friction material consists of seven components; five of them were kept in a constant proportion (60%wt), and two (40%wt) were varied in fraction volume, namely phenolic resin and hemp fiber. For each recipe, the effect of phenolic resin on density, porosity, hardness, thermal stability, and friction-wear characteristics was analyzed. The study indicates that finding the optimal balance between phenolic resin and hemp fiber constitutes an efficient approach in improving friction performance. Additionally, the study demonstrates the viability of organic composite materials in braking applications, as they are capable of meeting the performance levels established by traditional materials.

Bone substitutes are found in natural or synthetic form. Different types of bone substitutes are used, including alloplasts or xenografts. These materials should be biocompatible, and have adequate mechanical properties. Bone substitute materials have become a clinical procedure in the treatment of periodontitis. In current practice, various bone substitutes are used, including alloplasts (β-tricalcium phosphate) and xenografts with good results. The aim of this study was to evaluate the efficacy of alloplasts (β-tricalcium phosphate) and xenografts in the preprosthodontic periodontal therapy of intrabony defects. The study was carried out on a group of patients with severe periodontitis treated by periodontal surgery, in which these materials were used as bone substitutes. Patients presented or not performed fixed prosthetic restorations. These biomaterials function as osteoconductive scaffolds. Both materials ensure the filling of bone defects in periodontal intrabony defects through their own capabilities. Alloplasts (β-tricalcium phosphate) and xenografts are effective in periodontal regeneration. The evaluation of periodontal parameters after the surgical interventions with bone substitutes indicates the favorable prognosis over time of the two types of materials used.

The paper presents our studies regarding the superior valorization of recycled low-density polyethylene (rLDPE) by compounding with thermoplastic starch (TPS) and ethylene propylene terpolymer elastomer (EPDM). Low-density polyethylene post-consumer waste from foil packaging was used for the experiments. The waste was mechanically recycled and the rLDPE granules obtained were characterized both from a physical-mechanical and structural point of view. In order to obtain new sustainable materials, rLDPE granules were mixed with TPS, EPDM, compatibilizers and crosslinking agents. The mixtures were obtained in a PlastiCorder Brabender mixer at 140�C, 30-80 rpm, working time 7 minutes. The samples made show very good resistance to bending and abrasion, they have very good values of Charpy impact resistance and tear strenght, they show very good behavior to accelerated aging and to the action of some liquids, they have high hardness (51-53) �ShD and a Vicat softening point of 93-96�C. The new materials can be processed by methods specific to plastic materials (extrusion, injection, compression) in order to obtain finished products, and their field of applications can include: the footwear industry, the automotive industry, construction, packaging, agriculture, etc. The LCA analysis of the composites show a low environment impact. The values of the carbon footprint range between 0.58 Kg CO2 eq/kg and 0.75 Kg CO2 eq /kg due to the use of recycle low-density polyethylene and optimised efficient production process.