Advanced polycarbonate foam: Enhancing foamability and …
2024年10月15日 · The incorporation of EPDM nanofibrils is pivotal in mitigating local tensile stresses induced by crystallized PC foam molecules, leading to the prevention of cell opening and enhancement of cellular structure uniformity in composite foams.
prepared intercalated polycarbonate (PC)/clay nanocom-posite (PCCN) foams in a batch process, by using super-critical CO 2 as a physical foaming agent. [3] The PCCN foam exhibited smaller cell size and larger cell density compared with neat PC foam. However there are still some controversial data regarding the nucleating effect of the
Polycarbonate foams with tailor-made cellular structures by …
2014年4月1日 · In this work we present the preparation using a two-step foaming process of closed-cell PC foams with tailored cellular structures that varied from isotropic-like microcellular to highly oriented and with bigger cells by controlling the dissolution temperature of scCO 2, as well as the effects of foaming on the physical aging of PC, as the ...
The Study of Crystallization Behavior, Microcellular Structure and ...
Polycarbonate (PC) foam is a versatile material with excellent properties, but its low thermal stability limits its application in high-temperature environments. The aim of this study was to improve the thermal stability of PC foam by adding glass ...
A path to nano-cellular foams: Constrained cell nucleation and growth ...
2021年11月19日 · The morphological parameters can affect the foam structure in MNL film/foam systems through three mechanisms: (ⅰ) confinement of cell growth by adjacent film layers, (ⅱ) promotion of heterogeneous cell nucleation at the interfaces, and (ⅲ) prevention of cell deterioration mechanisms.
Foam Processing and Cellular Structure of Polycarbonate…
2006年7月3日 · The cellular structures obtained from various foaming temperature-CO 2 pressure ranges were investigated by SEM. The incorporation with nanoclay-induced heterogeneous nucleation occurs because of a lower activation energy barrier compared with homogeneous nucleation as revealed by the characterization of the interfacial tension between bubble ...
Nanoporous structure of the cell walls of polycarbonate foams
2014年3月1日 · Using CO2 to prepare microcellular polycarbonate foams resulted in a pore diameter of 45 nm and a pore density of 108 cm−2 on the walls of microscale cells, which created nano/micro foams with...
Nanoporous structure of the cell walls of polycarbonate foams
2013年12月24日 · Using CO 2 to prepare microcellular polycarbonate foams resulted in a pore diameter of 45 nm and a pore density of 10 8 cm −2 on the walls of microscale cells, which created nano/micro foams with an open cell structure. In this study, the craze nucleation theory and the bubble nucleation theory of foaming were combined to explain the ...
Foam Processing and Cellular Structure of Polycarbonate‐Based ...
2006年7月14日 · Via a batch process in an autoclave, foam processing of intercalated PC/clay nanocomposites, having different amounts of clay, has been conducted using supercritical CO 2 as a foaming agent. The...
Firstly, CO2 diffusion behavior in polycarbonate was studied by means of desorption experiments. The cellular structure of foams prepared under different foaming conditions was characterized through scanning electron microscopy. Different foaming temperatures as well as CO2 saturation pressures and times were applied.