Study of thermal, morphological, barrier and viscoelastic properties of PP grafted with maleic anhydride (PP-g-MAH) and
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ORIGINAL PAPER
Study of thermal, morphological, barrier and viscoelastic properties of PP grafted with maleic anhydride (PP‑g‑MAH) and PET blends Asra Tariq1 · Ayesha Afzal1 · Iqra Abdul Rashid1 · M. Fayzan Shakir1 Received: 9 May 2020 / Accepted: 11 September 2020 © The Polymer Society, Taipei 2020
Abstract Properties of polyethylene terephthalate (PET) and polypropylene (PP) can be enhanced by blending both in a specific proportion to get combined superior properties. To make a homogeneous blend, maleic anhydride functionalized PP (PP-g-MAH) was used as a compatibilizer in 60% PET blends. In all blends, PET’s percentage crystallinity was reduced as compared to pure PET because there were hindrances in chains packing because of the presence of PP chains. The addition of compatibilizer in PET and PP blend enhanced interactions resulted in a homogeneous blend with fewer voids. 2.5% of PP-g-MAH was observed to be the optimum value of compatibilizer in the blend of PET and PP. The decrease in free space inside the blend hindered water molecules’ passage through the sheets. Owing to this, water vapor permeability of the blend was less compared to pure PET. The addition of the nonpolar PP also influenced the water transmittance rate of blended sheets. Keywords PP-g-MAH · Polymer blends · Compatibilizer · Viscoelasticity · Morphology · Water permeability
Introduction Polymer blends can be defined as mixtures of at least two types of polymers, with physical interactions sometime may also have covalent bonds between them [1]. Among the most widely employed blends generated with improved properties are polypropylene (PP)/Nylon [2], polylactic acid (PLA)/ polybutylene succinate (PBS) [3], ethylene vinyl alcohol (EVOH) /PP [4], EVOH/ polyethylene (PE) [5] and PP/PLA [6] PE/ polyethylene terephthalate (PET) [7]. Polymer blends can be miscible or immiscible. To convert immiscible polymer blend to miscible blend, compatibility between polymers is enhanced by modifying the interphase that will reduce the interfacial energy. The miscibility of the components depends on several factors such as interfacial tension, adhesion between two phases and melt viscosities of the components. Miscibility can be achieved by creating linkages such as, short time cross linking or reversible crosslinking, by introducing ionic interactions or hydrogen bonding. However, the most common method is inclusion or generation of the medium that will improve the interfacial * M. Fayzan Shakir [email protected] 1
Department of Polymer Engineering, National Textile University, Faisalabad, Pakistan
properties in polymer blends, which has been an objective of this research work [8]. Polypropylene (PP) and polyethylene terephthalate (PET) are approved for food contact during storage. PP is stiffer, denser, and more transparent than polyethylene (PE). It has extremely effective barrier properties for water vapor due to its nonpolar nature. PP has low gas barrier properties hence where the high gas barrier is required, such as in food packaging,
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