Gamma irradiation effects on polycaprolactone/zinc oxide nanocomposite films

Paula, Marcos; Diego, Ivo; Dionisio, Ronaldo; Vinhas, Glória; Alves, Severino

doi:10.1590/0104-1428.04018

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ORIGINAL ARTICLE • Polímeros 29 (1) • 2019 • https://doi.org/10.1590/0104-1428.04018 copy

Gamma irradiation effects on polycaprolactone/zinc oxide nanocomposite films

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Polycaprolactone (PCL) to which has been added zinc oxide nanoparticles (ZnO NPs) produces nanocomposites (PCL/ZnO NCs). These nanocomposites can be used in biomedical applications and in the food packaging sector. However, for these materials to be used in these applications, they need to be sterilized. For this, gamma irradiation is the most common method. Thus it is important to evaluate the effects of gamma irradiation on the properties of PCL and PCL/ZnO that have been exposed to gamma irradiation. PCL/ZnO NCs films were obtained by solvent casting and exposed to gamma irradiation at 25 kGy and evaluated by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) scanning electron microscopy (SEM) and mechanical properties. Mechanical properties and crystallinity showed marginal variations for the irradiated samples. The results obtained demonstrate that gamma irradiation at 25 kGy, did not cause profound changes in nanocomposite properties.

Keywords:
polycaprolactone; gamma irradiation; nanocomposites; materials properties

Sample	T₁₀ (°C)	T₅₀ (°C)	Residual mass (%) at 600 °C
PCL	370	400	1.94
PCL/ZnO 0.5%	326	389	1.90
PCL/ZnO 1%	331	378	1.77
PCL/ZnO 2%	333	372	2.20
PCL/ZnO 5%	326	358	4.86
PCL-25 kGy	376	407	1.55
PCL/ZnO 0.5%-25 kGy	293	344	1.51
PCL/ZnO 1%-25 kGy	282	326	1.46
PCL/ZnO 2%-25 kGy	274	318	2.28
PCL/ZnO 5%-25 kGy	285	330	5.18

Sample	T_m(°C)	T_c (°C)	∆H_m (J/g)	X_c (%)
PCL	61.33	20.46	61.14	43.89
PCL/ZnO 0.5%	63.47	22.58	57.34	41.11
PCL/ZnO 1%	65.46	21.15	55.02	39.50
PCL/ZnO 2%	63.67	23.26	55.40	39.80
PCL/ZnO 5%	61.72	20.73	55.15	39.59
PCL-25 KGy	61.91	23.46	44.82	32.18
PCL/ZnO 0.5%-25 kGy	62.41	22.56	58.08	41.70
PCL/ZnO 1%-25 kGy	62.07	23.10	67.62	48.54
PCL/ZnO 2%-25 kGy	61.82	23.46	56.90	40.85
PCL/ZnO 5%-25 kGy	63.91	21.06	58.19	41.77

Sample	σ (MPa)	ε (MPa)
PCL	6.65±1.23^a	168.83±16.35^b,c,e,f
PCL/ZnO 0.5%	10.69±3.33^a,b	144.23±22.25^a
PCL/ZnO 1%	9.22±1.43^a,b	162.30±7.96^a,b,c
PCL/ZnO 2%	13.15±3.81^b	173.60±4.38^c,e,f
PCL/ZnO 5%	7.84±0.25^a	183.33±11.24^e,f
PCL-25 kGy	9.97±0.84^a,b	165.06±14.51^a,b,c
PCL/ZnO 0.5%-25 kGy	8.15±1.10^a	155.13±5.09^a,b,c
PCL/ZnO 1%-25 kGy	8.50±1.58^a	148.10±11.10^a,b
PCL/ZnO 2%-25 kGy	7.00±1.77^a	165.66±6.81^a,b,c
PCL/ZnO 5%-25 kGy	6.70±4.13^a	188.5±9.00^f

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