Mechanical Properties of UV Irradiated Bio Polymer Thin Films Doped with Titanium Dioxide

Abstract

This study reports on the effect of UV-light on the mechanical properties of bio polymer thin films (BPF) doped with 10 % Titanium Dioxide (TiO2). Bio monomer was mixed with 4, 4-methylenebis (phenylisocyanate) (MDI) to produce neat BPF and TiO2 was added to form BPF doped with 10 % TiO2. The film samples were irradiated in UV Accelerated Weatherometer at 50 °C with different exposure time. Universal Testing Machine was used to measure the tensile strength and the fracture surfaces of the tensile specimens were observed by Scanning Electron Microscopy (SEM). The maximum tensile strength of UV irradiated neat BPF is lower than BPF doped with 10 % TiO2 of 3.5 MPa and 4.2 MPa respectively. Stress of neat BPF was decreased from 3.7 MPa to 3.2 MPa after 144 hours of UV exposure at 50 °C while BPF doped with 10 % TiO2 decrease from 4.7 to 3.6 MPa. The Modulus Young of neat BPF is lower than BPF doped with 10 % TiO2 which are 0.32 GPa and 0.33 GPa respectively. The cumulative strain percentage irradiated neat BPF is lower than BPF doped with 10 % TiO2 with 98.7 % and 113.7 % respectively. Unexposed UV light of neat BPF and BPF doped with 10 % TiO2 were observed by SEM shows smooth fracture and brittle fracture respectively. Neat BPF and BPF doped with 10 % TiO2 exposed to UV light show higher ductility property as compared to unexposed BPF. The higher the exposure time of BPF to UV light, revealed systematic increment of tensile strength due to increased crosslink between isocyanate and hydroxyl group.

The Aging of Polymers under Electromagnetic Radiation

“…Electromagnetic sources with wavelengths ranging between 300 and 400 nm could influence the generation and breakage of the bonds between polymer molecules [ 123 , 124 ]. Free radicals are produced in the polymer as the wavelength of electromagnetic radiation increases towards the 400 nm threshold [ 125 ]. The adverse effects of plastic material aging on the generation of secondary materials like anthocyanins and total phenolics that degrade the surroundings have also been covered by Katsoulas et al [ 126 ] as one of the elements of pure polythene used for blocking UV radiation in greenhouses.…”

“… Electromagnetic radiation of 300 and 400 nm wavelengths causes the natural aging of LDPE plastics. Adding additives elongates the lifespan of these plastic materials [ 125 ] Siti et al Mechanical properties of UV irradiated bio polymer thin films doped with titanium dioxide The study used an experimental research design whereby film samples were irradiated in a UV-accelerated weatherometer at temperatures of 50 °C with varying durations of exposure The study discovered that as the wavelengths increased, more free radicals were released from the polymer structure. Neat BPF coupled with BPF doped with 10% TiO2 and then subjected to UV radiation showed higher ductility than the unexposed BPF.…”

Sound Absorption of Laminated Biopolymer Foam and Epoxy Foam

“…Raw Materials. The raw materials for biopolymer laminated epoxy foam: bio-monomer based on waste cooking oil monomer [7][8][9][10][11][12][13][14], flexible isocyanate, Polyol flexible (Epoxy).…”

“…Bio foam with controlled pore size and structure can be produced from biodegradable polymers from renewable resources such as vegetable oils (VOs) obtained from agricultural products of soybean, palm oil, rapeseed, sunflower and coconut. In this research, bio foam and commercial foam is laminate with difference thicknesses is used to examine the sound absorption according to previous studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Effect of Thickness for Sound Absorption of High Density Biopolymer Foams

“…In this paper, biopolymer foams were produced by using waste cooking oil monomer. Historically, flexible polyurethane foams produced from the polycondensation between polyols and isocyanate, formed by open cells and high gas permeability, low density and limited mechanical strength [4][5][6][7]. Due to this situation, the waste biopolymer foam was used to be fabricated into HDB by using hot compression technique.…”