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Evaluation of the strength properties of materials intended for tracheobronchial tubes

100%

Sobota R. , Markowski J. , Joszko K. , Gzik-Zroska B. , Kawlewska E. , Gzik M.

tom Vol. 23, no. 156

10--16

The desire to increase the comfort of patients and to continue production despite the decreasing amount of available materials on the market has led to the constant search for novel materials that could be used to obtain tracheobronchial tubes. The aim of this study is to determine the mechanical properties of a new thermoplastic elastomer. Two materials - the thermoplastic elastomer and the natural rubber were subjected to three tests: static tensile test, static compression test and static three-point bending test. During the static tensile test, samples of the tested materials were examined, and during the next two examinations, the final products. The materials underwent the processes of sterilization, hydrolytic degradation and degradation by oxidation. The treated samples were also tested in order to compare the obtained results. The mechanical properties of the tested materials improved both after the hydrolytic degradation and oxidative degradation, as well as after the sterilization process. Yet the thermoplastic elastomer revealed a more noticeable increase. The elastomer hardening is a positive phenomenon potentially leading to fewer accidental closures of the tubes cross-section. Both the sterilization process and various degradation methods improved the mechanical properties by strengthening the tested materials. This phenomenon seems to be desirable to avoid the closure of the implemented tube during its application.

Effect of Nano and Micro size of Copper Oxide on the Properties of Thermoplastic Elastomer

88%

Badura K.

tom Vol. 18, no 7

78--91

The objective of the research was to assess the feasibility of utilizing copper oxide particles as a reinforcing and conductive additive in a thermoplastic elastomer. This study focused on examining the influence of particle size on primary strength characteristics and aging resistance, as well as conducting an impedance measurement to gauge the impact of copper oxide particles on electrical conductivity. The findings of the study revealed that incorporating copper oxide particles at the nanoscale leads to enhanced mechanical and conductive properties in comparison to both the base material and the composite with microparticles. However, it was observed that the addition of microparticles in a 5% by weight ratio failed to provide significant improvements in strength and electrical conductivity. Additionally, the study found that the incorporation of copper oxide nanoparticles improves the aging resistance of the composite.

Poli(oksyetyleno-b-tereftalan trimetylenu) : synteza, struktura, degradacja

51%

Rokicka J. , Kotowski D. , Ukielski R.

tom [R.] 18, nr 6

632-636

Otrzymano poli(estro-b-etery) składające się z poli(tereftalanu trimetylenu) (PTT) jako bloku sztywnego oraz poli(oksyetyleno)diolu (PEG) jako bloku giętkiego. Metodami 1H NMR oraz FTIR potwierdzono zakładaną strukturę kopolimerów. Metodami DSC i DMTA zdefiniowano właściwości termiczne i rozdział fazowy otrzymanych układów. Materiały poddano testom podatności na degradację hydrolityczną w roztworach o pH=4,9; 7; 8,5 oraz na degradację w glebie. Degradację polimerów po 8 tygodniach oceniono mierząc zmianę lepkości istotnej.

New poly(ester-b-ether) multiblock elastomers containing poly(trimethylene terephthalate) hard segments and polyoxyethylene soft segment were prepared and studied by 1H NMR and FTIR methods to confirme their assumed chemical structures and by DSC and DMTA methods to define the phase separation and thermal properties. Materials were subjected to hydrolytic degradation in solutions of pH: 4,9; 7; 8,5; and degradation in soil. The degradation after a period of 8 weeks was measured by the change of intrinsic viscosity of the polymers.