Effects of liquid crystal polymer and organoclay addition on the physical properties of high‐density polyethylene films

Abstract

In this study, physical properties of high‐density polyethylene (HDPE) films, blended and reinforced with small amounts of liquid crystal polymer (LCP) and organoclay (org‐clay), were investigated by employing different characterization tools such as X‐ray diffractometer, scanning electron microscope, differential scanning calorimetry, rotational rheometer, dynamic mechanical analysis, and gas permeability measurements. Viscoelastic properties of samples were quantified by applying several test procedures in melt and solid‐state dynamic measurements. It was found that rigid LCP droplets were dispersed well into HDPE matrix and improved the melt elasticity and creep resistance of HDPE. Compatibilizer and org‐clay loading into HDPE/LCP blends yielded formation of smaller LCP droplets and reduced mean relaxation time and shear modulus values, compared to unloaded counterparts. It was observed that org‐clay stacks were dispersed into HDPE phase due to using of maleic anhydride grafted polyethylene as compatibilizer and HDPE/LCP/org‐clay ternary nanocomposites exhibited intercalated microstructure. Solid‐state uniaxial tensile creep behaviors of films were modeled with the Findley power‐law and four‐element Burger models. HDPE/LCP/org‐clay (90/10/5) ternary nanocomposite film exhibited better gas barrier performance than HDPE by decreasing its permeability by 50%. POLYM. ENG. SCI., 59:1344–1353 2019. © 2019 Society of Plastics Engineers

An Industrial Case for Polypropylene Nanocomposite Foams: Lightweight, Soundproof Exterior Automotive Parts

“…The test specimens of transmission loss measurements with a 30 mm radius and a thickness of 10 mm ( Figure 1 ) were cut via a computer numerical control (CNC) machine. To guarantee proper dispersion and distribution, and to prevent agglomeration, a screw design was chosen with a configuration that enabled intense shear and high residence time, arranged with kneaded convey blocks and the design of the selected screw configuration [ 24 ].…”

Sıcak Plaka Kaynak Yöntemi ile Birleştirilmiş Benzer ve Benzer Olmayan Alçak Yoğunluklu Polietilen (AYPE) Bağlantıların Mekanik Özelliklerinin Karşılaştırmalı Olarak Araştırılması

“…Öte yandan, yüksek yoğunluklu polietilen diğer polietilen sınıflarına göre nispeten yüksek ergime sıcaklığı ve daha dengeli mekanik özellikleri sebebiyle, ısıl ve mekanik mühendislik uygulamalarında sıklıkla tercih edilmektedir [13,14]. Yüksek süneklik, yüksek tokluk, üstün kimyasal ve çevresel dayanıklılık özellikleri bu malzemelerin otomotiv parçalarından boru hatlarına, paketlemeden denizcilik sektöründe kullanımına kadar geniş ve yaygın uygulama alanlarının önünü açmıştır [15][16][17][18].…”