Reactive melt modification of polyethylene by ethyl acrylate/acrylic acid copolymers: rheology, morphology and thermal behavior

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• 作者：Yousef Jahani ; Aida Valavi ; Farshid Ziaee
• 关键词：Polyethylene ; Acrylic copolymer ; Reactive blending ; Grafting ; Rheology ; Morphology
• 刊名：Iranian Polymer Journal
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：24
• 期：6
• 页码：449-458
• 全文大小：851 KB
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• 作者单位：Yousef Jahani (1)
  Aida Valavi (2)
  Farshid Ziaee (3)
  
  1. Faculty of Polymer Processing, Iran Polymer and Petrochemical Institute, P.O.BOX: 14965/115, Tehran, Iran
  2. Department of Polymer Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
  3. Department of Polymer Science, Iran Polymer and Petrochemical Institute, P.O.Box: 14965/115, Tehran, Iran
  
• 刊物主题：Polymer Sciences; Ceramics, Glass, Composites, Natural Methods;
• 出版者：Springer Berlin Heidelberg
• ISSN：1735-5265

文摘

Polyethylene (PE) was in situ grafted and blended with ethyl acrylate and acrylic acid copolymer units and the rheology, morphology and thermal behavior of samples were investigated and correlated to grafting efficiency. The ethyl acrylate and acrylic acid monomers were copolymerized in three different amounts of monomers (i.e., 5, 15 and 25 wt%) and three different amounts of 2,2-azobisisobutyronitrile (AIBN) initiator (i.e., 0.2, 0.3 and 0.4 wt%). The reactive melt blending of the synthesized copolymers, PE and dicumyl peroxide (DCP) were carried out in a co-rotating, 40 L/D twin screw extruder. The grafting percentage, determined by using chemical titration and Fourier transform infrared (FTIR) methods, increased at higher amounts of reactive monomers and AIBN and a maximum of 6?% was achieved. The thermal behavior of PE were studied by differential scanning calorimeter (DSC) and no remarkable changes was observed in melting (T _m?=?127.0?±?2?°C) and crystallization (T _c?=?113.6?±?2?°C) temperatures. The crystallinity of PE decreased from 53.5 to 43.8?%, with increase in grafting density. Investigating the gel content showed that only in samples that contained the highest amounts of acrylic monomer, i.e., 25 wt%, an increase in gel content was observed by increasing the total peroxide. The maximum value of gel content was 23.6?%. Increase in acrylate and AIBN percentages showed increase in viscosity and damping factor and decrease in storage modulus in rheological study of the samples and the results were proved by morphological study of the samples using scanning emission microscopy (SEM).