Search Results

You are looking at 1 - 10 of 11 items for :

  • "composite structure" x
  • Chemistry and Chemical Engineering x
  • Refine by Access: All Content x
Clear All

Abstract  

Specific heat capacity of boron nitride-filled polybenzoxazine has been investigated by using temperature-modulated differential scanning calorimetry, TMDSC, to study that it is a composite structure-insensitive property, i.e. independent of the degree of filler network formation. Many aspects of boron nitride filler such as particle size, particle surface area, particle shape, and filler loading are investigated. At the same filler loading, we observe insignificant change in composite specific heat capacity due to the effect of particle size, particle surface area, and particle shape. Filler loading is found to be the only aspect of filler that can change the specific heat capacity of this filled system. A linear relationship between the composite heat capacities and filler loading is observed and can be predicted by the rule of mixture with an error within ±1%. Within the temperature range betwen 0 and 80°C, the temperature dependent heat capacity of this composite can simply be expressed in the form of a linear equation: C p=A+BT.

Restricted access

Abstract

A group of cyanoethylated amine (CEA) has been synthesized by carefully reacting triethylenetetramine with varying proportions of acrylonitrile. Such CEAs were utilized as hardener for the curing of epoxy resin. The effect of cyanoethylation of amine on their curing reaction with epoxy resin has been studied by differential scanning calorimeter (DSC). The processing temperature for the fabrication of composite is estimated from the DSC analysis with an approach to satisfy the logical selection of temperature for application of pressure during processing of a composite structure. The exotherm of such curing reaction (ΔH ex) and the degree of cyanoethylation (CEt) of the amine follow the relation ΔH ex = (324–68.40 CEt) J g−1.

Restricted access

Abstract  

The novel film structure of corn-zein coated on polypropylene (PP) synthetic film for packaging industry was developed to examine the feasibility of resulting coated films as an alternative water barrier performance for food packaging. The effects of coating formulation (solvent, corn-zein, plasticizer concentration and plasticizer type) on final properties of films were observed. Corn-zein is the most important protein of corn and has good film forming property. Composites structures of PP films coated with corn-zein were obtained through a simple solvent casting method. Polyethylene glycol (PEG) and glycerol (GLY) were used as plasticizer to increase film flexibility. Statistical analysis based on full factorial design was performed to observe coating formulation effects. The high water vapour barriers were obtained for films coated with coating formulation consisting of higher amounts of corn-zein plasticized by GLY. The lower glass transition temperatures (T g) of films were obtained by plasticization of films and T g decreased by increasing plasticizer content. The statistical analysis defined the key parameters of coating formulation that had major effects on the final properties of coated PP films as corn-zein, plasticizer concentration and plasticizer type. In conclusion, corn-zein coatings could have potential as an alternative to conventional synthetic polymers used in composite multilayer structures for food packaging applications.

Restricted access

in the mobility of the evaporating molecules as a consequence of low conformational mobility of the polymer molecules. The composite structure formed exhibits less enthalpy changes in comparison with unfilled polyHEMA. The above mentioned change

Restricted access

, heterogeneous multiphase material, which is often considered to be a three-phase composite structure. Its structure includes aggregate particles, the cement paste matrix in which they are dispersed, and the interfacial transition zone around the aggregate

Restricted access

materials at the same place as signal derived from MMT-Ch7 can be the evidence that composite structure was obtained for all PE-based materials. —Thermal analysis of the modified clay suggests that the clay is stable

Open access

microstructure has been performed up to 1300 °C using the ETA technique. Imaging of the composite structure Non-destructive imaging techniques are essential to visualize the structure and possible defects within the SiC f /SiC

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors:
S. Ľalíková
,
M. Pajtášová
,
M. Chromčíková
,
M. Liška
,
V. Šutinská
,
M. Olšovský
,
D. Ondrušová
, and
S. C. Mojumdar

describes in detail DMTA that is very useful in studying composite structure and performance. DMTA can provide a complete description of the viscoelastic properties by dynamic experiments conducted over a range of time, temperature or frequency. This method

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors:
Cheng-Li Jiao
,
Li-Fang Song
,
Chun-Hong Jiang
,
Jian Zhang
,
Xiao-Liang Si
,
Shu-Jun Qiu
,
Shuang Wang
,
Li-Xian Sun
,
Fen Xu
,
Fen Li
, and
Ji-Jun Zhao

Anal Calorim 90 : 713 – 719 10.1007/s10973-007-8527-4 . 22. Ishida , H , Rimdusit , S 1999 Heat capacity measurement of boron nitride-filled polybenzoxazine—The composite structure

Restricted access

other. The PVA chain diffusion into galleries of OMMT layers was accomplished during pan-milling process. In order to further illustrate the composite structures, the morphology of composites was observed by TEM. Figures 4 and 5 show the TEM images

Restricted access