Microwave-Assisted Synthesis of Polylactic Acid-Diol for Polyurethane as Biodegradable Packaging Material

Razali, Nasrullah; Ali, Fathilah; Azmi, Azlin Suhaida; Ismail, Tuan Noor Maznee Tuan; Mirghani, Mohamed Elwathig Saeed; Omar, Mohd Firdaus

doi:10.1088/1757-899x/1192/1/012015

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…PLA has also been introduced into polyurethane molecules to modify the latter. Previous polyurethanes based on PLA are plastic at room temperature because of the high molecular weight of their soft segments and, thus, cannot be used as elastomers [ 28 , 29 ]. A series of PLA-based TPUs were prepared using PLA as soft segments; the T g values of these materials were close to room temperature, and their damping performance was enhanced compared with other polyurethanes at room temperature [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Bio-Based Polyurethane and Its Composites towards High Damping Properties

et al. 2022

IJMS

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The operation of mechanical equipment inevitably generates vibrations and noise, which are harmful to not only the human body but also to the equipment in use. Damping materials, which can convert mechanical energy into thermal energy, possess excellent damping properties in the glass transition region and can alleviate the problems caused by vibration and noise. However, these materials mainly rely on petroleum-based resources, and their glass transition temperatures (Tg) are lower than room temperature. Therefore, bio-based materials with high damping properties at room temperature must be designed for sustainable development. Herein, we demonstrate the fabrication of bio-based millable polyurethane (BMPU)/hindered phenol composites that could overcome the challenges of sustainable development and exhibit high damping properties at room temperature. BMPUs with a high Tg were prepared from modified poly (lactic acid)-based polyols, the unsaturated chain extender trimethylolpropane diallylether, and 4,4′-diphenylmethane diisocyanate, and 3,9-Bis-{1,1-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl-)propionyloxy]ethyl}-2,4,8,10-tetraoxaspiro [5,5]-undecane (AO-80) was added to prepare BMPU/AO-80 composites. Finally, the properties of the BMPUs and BMPU/AO-80 composites were systematically evaluated. After adding 30 phr of AO-80, the Tg and maximum loss factor (tan δmax) of BMPU/AO-80 composites increased from 7.8 °C to 13.5 °C and from 1.4 to 2.0, respectively. The tan δmax showed an improvement of 43%. Compared with other polyurethanes, the prepared BMPU/AO-80 composites exhibited higher damping properties at room temperature. This study proposes a new strategy to reduce society’s current dependence on fossil resources and design materials featuring high damping properties from sustainable raw materials.

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Section: Introductionmentioning

confidence: 99%

Bio-Based Polyurethane and Its Composites towards High Damping Properties

et al. 2022

IJMS

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“…Foam materials can be used as building and packaging materials because of their advantages such as lightweight, heat insulation, flame retardancy, sound insulation, and shock absorption [ 1 , 2 , 3 , 4 ]. However, the oil-derived foams on the market, such as polyurethane (PU) [ 5 , 6 ] and polystyrene (PS) [ 7 , 8 ], are nonrenewable materials that exhibit high carbon emission mode dominated by fossil energy. Although PU foams have good thermal insulation, they burn easily to release the highly toxic hydrogen cyanide, which causes great harm to human health and the environment.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Formaldehyde-Free Bio-Based Thermoset Resins for Fabrication of Highly Efficient Foams

Liu

Zheng

et al. 2022

Polymers

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Bio-based biodegradable foams were formulated from a crosslinkable network structure combining starch, furfuryl alcohol, glyoxal, and condensed tannin in the presence of p-toluenesulfonic acid (pTSA) and azodicarbonamide (AC) as a foaming agent. More importantly, the reinforcement of gelatinized starch–furanic foam using tannin, originating from forestry, resulted in an excellent compressive strength and lower pulverization ratio. Moreover, the addition of tannin guaranteed a low thermal conductivity and moderate flame retardancy. Fourier transform infrared (FTIR) spectroscopy approved the successful polycondensation of these condensing agents under the employed acidic conditions. Moreover, the catalytic effect of pTSA on the foaming agent induced liberation of gases, which are necessary for foam formation during crosslinking. Scanning electron microscopy (SEM) showed foam formation comprising closed cells with uniform cell distribution and appropriate apparent density. Meanwhile, the novel foam exhibited biodegradation under the action of Penicillium sp., as identified by the damage of cell walls of this foam over a period of 30 days.

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