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Investigation of Polypropylene-Montmorillonite Clay Nanocomposite Films Containing a Pro-degradant Additive

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Abstract

This paper investigates the performance of polypropylene (PP) incorporated with montmorillonite (MMT) nanoclay, maleic anhydride grafted PP (PP-g-MAH), and pro-degradant additive (TDPA®), which provides additional benefits of increasing biodegradability. A twin-screw extruder was used to compound PP, MMT, PP-g-MAH, and TDPA, and the extruded nanocomposite films were collected for testing, and their mechanical, thermal, barrier, oxo-biodegradability, and morphological properties were evaluated. Tensile test, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), oxygen permeability test, soil burial test, X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscope (SEM) analysis were used to investigate these properties. Increasing MMT content from 1 to 3 phr increases tensile strength and Young’s modulus of the neat PP samples up to ca.45% and 27% respectively. Improvement of thermal properties for neat PP samples was observed by increasing MMT content from 1 to 3 phr. However, at 4 phr MMT content, both mechanical and thermal properties of nanocomposites dropped slightly. For soil buried samples, DSC and TGA results revealed significant changes in the thermal properties for PP samples containing TDPE additive compared to neat PP, clearly confirming the effectiveness of this TDPA additive in promoting oxo-biodegradation process of PP. Similarly weight loss evaluation result shows that about 4% weight loss for sample (PP/TD), which is PP and TDPA blend only, compared to neat PP. However, increasing MMT content from 1 to 4 phr slightly reduced weight loss of PP from 3.5 to 1.5%, respectively, for 6 month soil exposure period, which indicates that increasing MMT content was detrimental to the degradation process. For higher MMT content, the oxygen permeability of PP nanocomposites was decreased by 46% of the corresponding values for neat PP. The XRD and TEM results confirmed the exfoliation structure of the nanocomposites. The morphological change after soil burial test was studied using scanning electron microscopy (SEM).

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Acknowledgements

The authors would like to thank the Kuwait Institute for Scientific Research (KISR) for providing the grant (project PC014K) that has made this research work possible. The authors also would like to express gratitute to Prof. Dr. AbdelMageed Safer, Miss Ahlam Al Kadi and Miss Nisha Philip from Kuwait University, Faculty of Science at Nanoscopy Science Center for providing TEM facility to analysize our nanocomposite samples.

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Authors and Affiliations

  1. Polymeric Products and Customization Program, Petroleum Research Center, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat, 13109, Kuwait

    A. A. Yussuf, M. A. Al-Saleh, M. M. Al-Samhan, S. T. Al-Enezi, A. H. Al-Banna & G. Abraham

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  1. A. A. Yussuf
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  2. M. A. Al-Saleh
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  3. M. M. Al-Samhan
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Correspondence to A. A. Yussuf.

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Yussuf, A.A., Al-Saleh, M.A., Al-Samhan, M.M. et al. Investigation of Polypropylene-Montmorillonite Clay Nanocomposite Films Containing a Pro-degradant Additive. J Polym Environ 26, 275–290 (2018). https://doi.org/10.1007/s10924-017-0946-0

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  • DOI: https://doi.org/10.1007/s10924-017-0946-0

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