This research work was to study the toughening modification of polylactic acid by the mixing with epoxidized natural rubber (ENR) and the increase of effectiveness of mechanical properties with a compatibilizer. Enhancement of properties in polylactic acid was evaluated by tensile and impact testings Fourier-transform Infrared Spectroscopy (FTIR) technique Differential Scanning Calorimetry (DSC) technique and Scanning Electron Microscope (SEM). For the addition of ENR it was revealed that the increase of ENR contents improved elongation at break and impact strength but decreased tensile modulus and ultimate tensile strength. Glass transition temperature (Tg) percentage crystallinity and the melting point of polylactic acid tended to decrease with the addition of ENR. Chemical change was found that position of C=O peak in polymer blend was slightly shifted as compared to the spectrum of neat polylactic acid. The optimum formulation for toughening modification was ENR content of 30 wt%. Its impact strength was 1982.55 % of neat polylactic acid. For increasing effectiveness of mechanical properties with a compatibilizer it revealed that the addition of Joncryl ® ADR-4300 as compatibilizer improved both tensile and impact properties. The optimum loading of a compatibilizer for improving mechanical properties was 0.5 wt% of polylactic acid. The decreases of crystallinity and melting point of polylactic acid with adding Joncryl ® ADR-4300 might be because Joncryl ® ADR-4300 was also chain extender of polylactic acid and it might be obstructing crystallization. The presence of Joncryl ® ADR-4300 unaffected on Tg value and chemical change.

The purpose of this study is design to develop double-walled design of natural materials (bamboo) to reduce radiant heat into the building. Reduce construction costs by using natural materials that are readily available locally. And can reduce the cost of energy use in the residential conditions occurring prior to cozy up to. The results of the double-walled design forms the third and then put to the test transmission of the sun. And select the appropriate model to test the temperature of the material other five by the results of the experiment showed that during the day as the first the second the fourth the fifth the temperature inside the box. The outside temperature is lower than the highest temperature. Especially in the case of five minimum temperature inside the box than any event since the space between two walls of floor to localized heat. But in this study tested the two-story wall material that attaches to the outside of the building is important. Wall mounted double-walled bamboo in the open with temperatures under all circumstances.

The objectives of the research werw 1)to study the creative level of Prathomsuksa 5 students who take constructivism learning 2)to com[pare the creativity of Prathomsuksa 5 students learning of the constructivism form with those learning of the normal form 3)to study the satisfactions towards learning in accordance with the constructivism form of Prathomsuksa 5