In the current doctoral thesis, two well-known biodegradable polymers,
polybutylene succinate (PBS) and polyhydroxybutyrate (PHB), are examined for
their complex interactions with diverse additives. The study focuses on the effects
of two different kinds of lignin antioxidants and essential oils on the
biodegradability and mechanical characteristics of these polymers.
The first step in the research is to examine how antioxidants from lignin and
essential oils may be added to the PBS and PHB matrices. This meant carefully
examining how well these additives worked with the polymers and adjusting their
concentrations to provide improved qualities. Advanced characterisation
techniques were used to evaluate the thermal stability, morphology, and chemical
interactions of the composite materials.
The modified PBS and PHB specimens will be exposed to simulated
environmental conditions in order to assess the effect on biodegradability. The
study also thoroughly will study the mechanical characteristics of the modified
PBS and PHB materials. A thorough knowledge of the additive impacts on the
overall performance and structural integrity of the polymers will be possible after
the determination of storage modulus, loss modulus, and other critical mechanical
characteristics.
The results of this study showed that alkali lignin, organosolv lignin, and the
chosen essential oils (eucalyptol, thymol, and limonene) could significantly retard
biodegradation. However, the influence of neutralized alkali lignin was greater
than that of the others in reducing PHB biodegradation (by around 50-60% with
a 12% addition). Another outcome was that the influence of lignin was evident
even with the addition of 1%, while essential oils had a completely different
effect. Adding a high percentage of essential oils made the polymer more flexible
than required by reducing the Tg. For PBS, the influence of both neutralized alkali
lignin and organosolv lignin was almost the same, retarding biodegradation from
10 to almost 55% with an addition of 1 to 12%, respectively. Mechanical and
thermal analyses were performed using DSC and DMA. The results showed that
the two types of lignin used had a positive influence on the mechanical and
thermal properties of the matrix. Moreover, by adding the optimum amount of
essential oil, these properties can be controlled while also having a significant
influence on biodegradation as antimicrobial agents.
| ISBN: | 978-80-7678-300-3 |
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| EAN: | 9788076783003 |
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| Počet stran |
30 stran |
| Datum vydání |
18. 12. 2024 |
| Pořadí vydání |
První |
| Jazyk |
anglický |
| Vazba |
e-kniha - pdf |
| Autor: |
Ahmad Fayyaz Bakhsh |
| Nakladatelství |
Univerzita Tomáše Bati ve Zlíně |
| Tématická skupina |
999 - nezařazeno |
| Neprodejná publikace. Publikaci je možné poptávat zde: Volně dostupné na http://hdl.handle.net/10563/56804 |
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