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Iranian Polymer Journal - This work aims at modelling and characterizing the kinetics of biodegradation of acrylic acid-grafted polypropylene. Different films of acrylic acid-grafted polypropylene... 相似文献
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The blends of high‐density polyethylene (HDPE) and poly(l ‐lactic acid) (PLLA) were prepared by melt blending method in an extrusion mixer with a postextrusion blown film attachment. The ratios of HDPE/PLLA blends were taken as 100/0, 95/5, 90/10, 85/15, and 80/20. The 80/20 blend was further compatibilized by adding maleic anhydride‐grafted polyethylene in different ratios (up to 8 wt%). Based on the mechanical properties of the films, the compositions HDPE80 (80% HDPE and 20% PLLA) and HD80C4 (80% HDPE, 20% PLLA, and 4% compatibilizer) were found to be optimum and considered for further analysis. The thermal properties of these selected blends were investigated by means of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA study revealed that the addition of the PLLA somewhat decreased the thermal stability of HDPE. DSC investigation showed that the blends were partially miscible only. X‐ray diffraction (XRD) analysis enlightened that the crystallinity of blends was slightly increased with addition of PLLA. Immiscibility of the two polymers was diminished in the presence of compatibilizer, as indicated by the scanning electron microscopy (SEM) of the blends. These partially biodegradable blends may be used for flexible packaging applications. POLYM. ENG. SCI., 54:2155–2160, 2014. © 2013 Society of Plastics Engineers 相似文献
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Gursewak Singh Navleen Kaur Haripada Bhunia Pramod K. Bajpai Uttam K. Mandal 《应用聚合物科学杂志》2012,124(3):1993-1998
In this study, the degradability of linear low‐density polyethylene (LLDPE) and poly(L ‐lactic acid) (PLLA) blend films under controlled composting conditions was investigated according to modified ASTM D 5338 (2003). Differential scanning calorimetry, X‐ray diffraction, and Fourier transform infrared spectroscopy were used to determine the thermal and morphological properties of the plastic films. LLDPE 80 (80 wt % LLDPE and 20 wt % PLLA) degraded faster than grafted low‐density polyethylene–maleic anhydride (M‐g‐L) 80/4 (80 wt % LLDPE, 20 wt % PLLA, and 4 phr compatibilizer) and pure LLDPE (LLDPE 100). The mechanical properties and weight changes were determined after composting. The tensile strength of LLDPE 100, LLDPE 80, and M‐g‐L 80/4 decreased by 20, 54, and 35%, respectively. The films, as a result of degradation, exhibited a decrease in their mass. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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Thermal properties and degradation characteristics of polylactide,linear low density polyethylene,and their blends 总被引:1,自引:0,他引:1
Melt blending of linear low density polyethylene (LLDPE) and polylactide (PLLA) was performed in an extrusion mixer with post
extrusion blown film attachment with and without compatibilizer-grafted low density polyethylene maleic anhydride. The blend
compositions were optimized for tensile properties as per ASTM D 882-91. Based on this, LLDPE 80 (80 wt% LLDPE & 20 wt% PLLA)
and M-g-L 80/4 (80 wt% LLDPE, 20 wt% PLLA and 4 parts compatibilizer per hundred parts of resin) were found to be an optimum
composition. FTIR reveals that the presence of compatibilizer shifts carbonyl peak hence some increase in interaction between
LLDPE and PLLA. Morphological characteristics of the fracture surface of with and without compatibilizer blends were examined
by scanning electron microscopy. It shows that use of compatibilizer enhances the dispersions of PLLA in LLDPE matrix. Thermogravimetric
(TG) analysis of blends shows the M-g-L 80/4 blend has higher thermal stability among studied blends. The degradation study
under different pH of soil compost gives that in alkaline condition and the presence of compatibilizer was favorable for degradation.
This blend may be used for packaging application. 相似文献
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Meenakshi Sheoran Haripada Bhunia Pramod K. Bajpai Harish J. Pant 《Chemical Engineering Communications》2018,205(6):739-758
Use of radiotracer in residence time distribution (RTD) studies in industrial as well as lab scale systems has been emphasized in this review. The advantages of radiotracer over conventional tracers are discussed. The injection and detection protocols of the radiotracers are explained. The pretreatment of RTD data obtained and RTD modeling are explained using industrial- and laboratory-scale studies. The detailed RTD studies in (i) oil and gas, (ii) pharmaceuticals and bioprocesses, (iii) fertilizers and pesticides, (iv) polymer, plastic and fiber, (v) mineral processing, organic and inorganic chemicals, (vi) laboratory scale, (vii) pilot plant scale, and (viii) wastewater treatment processes are considered for this review. The case studies are also explained with RTD experiments. The current trend on the application of radiotracer technology in industry is also explained. 相似文献
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