Preparation and crystallization of poly(ethylene terephthalate)/SiO₂ nanocomposites by in‐situ polymerization

Abstract

Poly(ethylene terephthalate) (PET)/SiO 2 nanocomposites were prepared by in situ polymerization. The dispersion and crystallization behaviors of PET/SiO 2 nanocomposites were characterized by means of transmission electron microscope (TEM), differential scanning calorimeter (DSC), and polarizing light microscope (PLM). TEM measurements show that SiO 2 nanoparticles were well dispersed in the PET matrix at a size of 10 -20 nm. The results of DSC and PLM, such as melt-crystalline temperature, half-time of crystallization and crystallization kinetic constant, suggest that SiO 2 nanoparticles exhibited strong nucleating effects. It was found that SiO 2 nanoparticles could effectively promote the nucleation and crystallization of PET, which may be due to reducing the specific surface free energy for nuclei formation during crystallization and consequently increase the crystallization rate.

Phase behavior of ternary polymer blends with favorable interactions

“…The addition of 3.0 wt % Barite and 3.0 wt % SABarite significantly improved the T on by 6.7 and 9.5 °C, respectively. These behaviors are similar to the results reported for the general nanocomposites prepared by in situ polymerization 17. Figure 4(b) shows a decrease (1–3 °C) in melting peak width (Δ T m ).…”

Living Tower Construction as Fish Apartment With Glass Powder/Pet Composite Basic Technology

“…Yang et al (2006) demonstrated that it is possible to control the crystallization behavior of PET by inorganic nanoparticles. Wang et al (2004) studied the non-isothermal crystallization behavior of pristine PET and PET/clay nanocomposites with a differential scanning calorimeter (DSC), and found that the introduction of clay into PET matrix weakens the dependence of the nonisothermal crystallization exotherm peak temperatures on the cooling rates.…”

In situ polymerization of poly(styrene- alt -maleic anhydride)/organic montmorillonite nanocomposites and their ionomers as crystallization nucleating agents for poly(ethylene terephthalate)

“…Due to high processing temperature of PET, the small organic compounds in the PET melt will be melted, volatilized, or pyrolyzed, and thus the nucleation effect is quite limited. The inorganic compounds are also used as nucleating agents, which need to solve the dispersal problem in the PET matrix [7].…”

“…Due to high processing temperature of PET, the small organic compounds in the PET melt will be melted, volatilized, or pyrolyzed, and thus the nucleation effect is quite limited. The inorganic compounds are also used as nucleating agents, which need to solve the dispersal problem in the PET matrix [7].According to the crystallization theory, the following requirements are necessary for designing effective nucleating agents. The nucleating agents should have good compatibility with polymer matrix when melt blending [8], high thermal stability and keep solid phase at the crystallization temperature of polymers, as well as large interface for crystal growth [9,10].…”