Synthesis and properties of interpenetrating networks from acrylates of d‐block elements

Gupta, Nupur; Srivastava, Archana

doi:10.1002/actp.1996.010470506

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…None of the blends exhibited a continuous uniform phase, which proves that the interaction between LDPE-g-MA and TPS was weak. In other studies [32], blends of starch, LDPE, and LDPE-g-MA were prepared. It was observed that the use of LDPE-g-MA played an important role in promoting interfacial adhesion between the TPS and LDPE.…”

Section: Scanning Electron Microscopy (Sem) Analysismentioning

confidence: 99%

The properties of blends of maleic‐anhydride‐grafted polyethylene and thermoplastic starch using hyperbranched polyester polyol as a plasticizer

Guzman

Murillo

2015

Polymer Engineering & Sci

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The first aim of this study was to prepare thermoplastic starch (TPS), namely blends of tapioca starch and hyperbranched polyester polyol and to evaluate the hyperbranched polyester polyol (HBP) as a plasticizing agent for tapioca starch. The second aim was to prepare blends of maleic-anhydride-grafted low-density polyethylene (LDPEg-MA) and TPS, and to evaluate the effect of the mass ratio LDPE-g-MA/TPS on the structural, thermal, rheological, morphological, and mechanical properties of the blends. The melting and crystallization temperatures of the LDPE-g-MA/TPS blends did not correlate well with the ratio of LDPEg-MA/TPS. The blends exhibited a reduction in the A-type crystallinity and a pseudoplastic rheological behavior. V-type crystallinity was not observed for neither TPS nor LDPE-g-MA/TPS blends. Scanning electronic microscophy provided an evidence for the presence of starch granules in all the blends and for low interaction degree between LDPE-g-MA and TPS. Young's modulus and tensile strength of the LDPEg-MA/TPS blends decreased with the decreasing LDPE-g-MA/TPS ratio. POLYM. ENG. SCI., 55:2526-2533, 2015. V C 2015 Society of Plastics Engineers INTRODUCTIONLow-density polyethylene (LDPE) is characterized by a good combination of strength, flexibility, impact resistance, and melt flow behavior [1]. It is also widely employed in the package industry [1]. Polyethylene (PE) has been modified with some compounds such as 2,2,6,6-tetramethylpiperidinyloxy [2], maleic acid [3], and maleic anhydride (MA) [4] to improve the compatibility in mixtures with hydrophilic materials.Hyperbranched polymers (Fig. 1) have been widely employed in a wide variety of applications due to a high packing structure, great number of functional groups located in the periphery sites, low viscosity in solution and molten state, and a lower degree of molecular entanglements than linear polymers [5][6][7][8][9][10][11][12][13][14]. Hyperbranched polyester polyols are usable alternatives in the plasticization processes of starch since these materials have high numbers of OH groups in their structures and can possibly interact with OH groups of starch via hydrogen bonding.So many materials have been employed to plasticize starch. Glycerol [15], sorbitol [15, 16], ethanolamine [17], urea [18], etc. are compounds commonly used to plasticize starch in order to obtain TPS. TPS has been the target of the studies owing to its low cost and ability to be modified or blended with other polymers [19,20]. The most used compatibilizers for LDPE/ TPS blends are the copolymers of ethylene-methacrylate ethylene-acrylic acid and LDPE-g-MA [21,22].An important fact is that LDPE has been used in blends with starch but the properties obtained have not been acceptable [21] since these blends are immiscible due to the lack of polar groups in the structure of LDPE. The use of LDPE-g-MA in blends with starch/fourth generation HBP can be an alternative to obtain materials with some degree of miscibility, since interactions can occur through polar groups.LDPE/sta...

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Section: Scanning Electron Microscopy (Sem) Analysismentioning

confidence: 99%