Crystallization behavior of carbon nanofiber/linear low density polyethylene nanocomposites

Abstract

Crystallization behavior of LLDPE nanocomposites is reported in the presence of three types of carbon nanofibers (CNFs) (MJ,. During nonisothermal crystallization studies, all three crystalline melting peaks for LLDPE matrix were observed in the presence of PR-19 nanofibers (up to 15 wt % content), but only the high-and low-temperature peaks were observed in the presence MJ nanofibers. The broad melting peak at low-temperature became bigger, suggesting an increase in the relative content of thinner lamellae in the presence of MJ nanofibers. TEM results of nanocomposites revealed transcrystallinity of LLDPE on the surface of CNFs, and a slightly broader distribution of lamellar thickness. STEM studies revealed a rougher surface morphology of the MJ nanofibers relative to that of PR nanofibers. Also, BET studies confirmed a larger specific surface area of MJ nanofibers relative to that of PR nanofibers, suggesting that the larger and the rougher surface of MJ nanofibers contributes toward the different crystallization behavior of MJ/LLDPE nanocomposites.

Easy one-pot method to control the morphology of polyethylene/carbon nanotube nanocomposites using metallocene catalysts

“…The peaks associated with (110), (200) and (020) planes of orthorhombic PE crystals appear at 2θ values of 21. 5°, 23.9°and 37.8°respectively for the pure PE sample [35]. For PE/CNT nanocomposites the expected peak at 2θ026°is not visible.…”

Microstructure of carbon nanofiber/thermotropic liquid crystalline polymer composites

“…Vectran V400P is a random copolyester primarily of 1,4‐HBA and 4,6‐HNA, but contains other comonomers that provide selected meta‐linkages14; Table I displays its relevant properties 15. PyrografIII™ PR‐24‐PS carbon nanofibers (CNFs) were provided by Applied Science, Inc. (Cedarville, OH), and relevant properties are summarized in Table II 16, 17…”

High performance PP/SEBS/CNF composites: Evaluation of mechanical, thermal degradation, and crystallization properties

“…where DH f is the normalized enthalpy of fusion, DH max is the enthalpy of fusion of 100% crystalline PP (207.1 J/g) and W poly is the weight fraction of PP in the blend. Effect of CNF on the crystallization process of polymers has been studied by various researchers [35][36][37][38][39][40][41][42][43][44]. Sandler et al [35] studied crystallization of CNT/PP and CNF/PP composites and observed that carbon nanomaterials act as nucleation sites in bulk samples and highly oriented composite films.…”