Blends of ethylene-co-vinyl acetate and poly(3-hydroxybutyrate) with adhesion property

Lucas-Freile, Alfonso de; Sancho-Querol, Sara; Yáñez-Pacios, Andrés Jesús; Marín-Perales, Laura; Martı́n-Martı́nez, José Miguel

doi:10.3144/expresspolymlett.2018.51

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…Low shrinkage results in a minimum level of residual stresses in the printed parts, eliminating deformation and delamination, while low melting temperature allows higher productivity of the printing processes [5]. In the past, large plastic components with functional or esthetic parts required a two-piece assembly -an injection molded part with mechanical interlocking, adhesive bonding or welding [6][7][8]. These techniques can be time-consuming and labor-intensive [9].…”

Section: Introductionmentioning

confidence: 99%

Combination of 3D printing and injection molding: Overmolding and overprinting

Boros¹,

Rajamani²,

Kovács³

2019

Express Polym. Lett.

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Nowadays, two of the most important polymer processing technologies are injection molding and 3D printing. Injection molding is ideal for mass production, while 3D printing is ideal for producing products with a complicated geometry. When these two technologies are combined, such complex products can be manufactured economically that would be too costly if produced traditionally. We present the possibilities of combining injection molding and 3D printing. We introduced a novel concept to study and compare the bonding strength of polylactic acid (PLA) parts prepared by overprinting and overmolding. We developed a special injection mold for overmolding, with which we injection molded ribs on a preform. The geometry of the overprinted part was similar for comparability. The thermal properties of the samples were determined by differential scanning calorimetry and thermogravimetric analysis. To analyze the strength of mechanical bonding, we developed a rib pull-off test. We tested all four manufacturing combinations with this test: overmolding onto a molded or printed plate and also overprinting onto a molded or printed plate.

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Section: Introductionmentioning

confidence: 99%

Combination of 3D printing and injection molding: Overmolding and overprinting

Boros¹,

Rajamani²,

Kovács³

2019

Express Polym. Lett.

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Preparation of thermo-responsive shape memory copolyester thermoplastic elastomer (COPE) and poly(ethylene-co-vinyl acetate) polymer blends

Tekay

2020

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Preparation of COPE/EVA blend through melt mixing  Determination of shape memory properties  Effect of composition on morphologyShape memory polymers (SHP) are smart materials that can change their shape when stimulated with an external stimulus such as heat, humidity, magnetic field and electric field. Thermo-responsive shape memory polymers have the ability to change their temporary shape with their permanent shape when they are exposed to an external heat stimuli and this ability gives them great potential for sensor, actuator, medical and packaging applications. Thermally sensitive shape memory polymers need at least two functional components. One of them is the switch component and it is responsible for fixing the temporary shape. The other component is the elastomeric component and it provides required driving force to recover the permanent shape. In this study, thermo-responsive shape memory copolyester thermoplastic elastomer (COPE) and poly (ethylene-co-vinyl acetate) (EVA) polymer blends were prepared and their shape memory characteristics were investigated. Figure A.Thermo-mechanical graph of the 50C-50E blend and photographs of shape memory behavior.Purpose: The aim of this study is preparation of novel thermally responsive shape memory COPE/EVA polymers blends and report their characteristics.Theory and Methods: COPE/EVA polymer blends were prepared through melt mixing of switch component EVA and elastic component COPE. Morphological, thermal, mechanical and shape memory properties of the prepared blends were investigated. Results:Scanning Electron microscopy (SEM) analysis showed that the polymer blend containing 50 wt% COPE and 50 wt% EVA showed co-continuous morphology, while other compositions were found to exhibit droplet morphologies. Among the blends, the 30C-70E exhibited 94.88% shape fixing ratio and 89.20% shape recovery ratio. On the other hand, 50C-50E blend with relatively higher deformability, showed the optimum shape fixing and recovery ratios.The shape memory analysis of the 50C-50E polymer blend in hot water showed that after the material was deformed and cooled, it retained its temporary shape, and when it was reheated, it quickly returned to its permanent shape. Conclusion:Novel thermally responsive shape memory COPE/EVA polymer blends were produced via melt mixing method. According to the thermo-responsive shape memory property analyses, the shape fixing (Rf) and shape recovery (Rr) ratios were increased when the amount of EVA increase in the polymer blend.

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Halloysit Nanotüp Takviyeli Kopoliester Termoplastik Elastomer Kompozitler: Isıl ve Mekanik Özelliklerin İncelenmesi

Tekay¹

2020

El-Cezeri Fen Ve Mühendislik Dergisi

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Nano dolgular polimerlerin ısıl ve mekanik özelliklerini geliştirmek için sıklıkla kullanılan malzemelerdir. Halloysit (HNT) içi boş tüp şeklinde doğal bir alümina silikat nano dolgudur. Bu çalışmada, termoplastik elastomer ailesinin bir üyesi olan kopoliester (COPE) polimerinin ısıl ve mekanik özellikleri organofilik HNT (Org-HNT) dolgusu ile geliştirilmeye çalışılmıştır. Değişik oranlarda (3,5 ve 7 phr) Org-HNT içeren kompozitler bir dahili karıştırıcı yardımıyla eriyik harmanlama metodu ile hazırlanmıştır. Elde edilen kompozitlerin morfolojik, reolojik, ısıl ve mekanik karakterizasyonları saf COPE ile karşılaştırmalı olarak incelenmiştir. Taramalı elektron mikroskobu (SEM) analizi, 3 ve 5 phr Org-HNT içeren kompozitlerin matris içinde göreceli daha homojen ve ince bir dağılım sergilediğini, 7 phr Org-HNT kullanıldığında ise nanotüplerin agregat şeklinde kaldığını göstermiştir. Org-HNT varlığında COPE'nin erime sıcaklığı artma eğilimi göstermiş ve bununla birlikte nanotüplerin nükleasyon ajanı etkisi ile kristalizasyon sıcaklığı yaklaşık 8°C artmıştır. Kompozitlerin elastik modül ve Shore sertlik değerleri Org-HNT miktarının artması ile doğru orantılı olarak artmış ve 7 phr Org-HNT içeren kompozitte, saf COPE ile karşılaştırıldığında, yaklaşık %55'lik modül artışı bulunmuştur. COPE'nin başlangıç bozunma sıcaklıkları Org-HNT'lerin iyi dağılım gösterdiği 3 ve 5 phr kompozitlerinde gelişme gösterirken 7 phr kompozitinde azalmıştır. Bununla birlikte bütün kompozitlerin maksimum bozunma hızları saf COPE'den daha düşük değerler almıştır.

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Blends of ethylene-co-vinyl acetate and poly(3-hydroxybutyrate) with adhesion property

Cited by 3 publications

References 20 publications

Combination of 3D printing and injection molding: Overmolding and overprinting

Combination of 3D printing and injection molding: Overmolding and overprinting

Preparation of thermo-responsive shape memory copolyester thermoplastic elastomer (COPE) and poly(ethylene-co-vinyl acetate) polymer blends

Halloysit Nanotüp Takviyeli Kopoliester Termoplastik Elastomer Kompozitler: Isıl ve Mekanik Özelliklerin İncelenmesi

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