Preparation And Research Of Thermal Resistant And High Toughness Polypropylene Composites

In this paper, high temperature resistant PP composites has been preparedby twin screw extruder. It was discussed that the effects of the polymer withhigh melting point TPX and PA6, inorganic filler (calcium carbonate, talcumpowder) on the mechanical properties, thermal performance, and microscopicstructure, rheological property, crystallization of PP. Results showed that TPXhave made the performance of PP drop, PA6, calcium carbonate and talcpowder could improve the comprehensive properties of PP.Research showed: PP100phr, PA620phr, PP-g-MAH10phr, comparedwith pure PP the porperties of PP composites has been improved. for instance,tensile strength has been increased5.44MPa, vicat softening point increasedhas been3.7℃, peak crystallization temperature has been increased9.3℃,initial weight loss temperature and when the weight loss50%temperaturehave been increased35℃,9℃.It was examined that effects of calcium carbonate or talcum powder onthe properties of PP, found that talcum powder was more better than calciumcarbonate to improve the strength and thermal resistant of PP. When PP 100phr, talcum powder30phr, compared with pure PP the porperties of PPcomposites has been improved. for instance, tensile strength has beenincreased1.17MPa, vicat softening point increased has been3.3℃, deflectiontemperature has been increased35.4℃, peak crystallization temperature hasbeen increased15.6℃, initial weight loss temperature and when the weightloss50%temperature have been increased30℃,12℃. Which description thattalcum powder can effectively improve the thermal resistance of PP.It was examined that effects of talcum powder surface modification onthe properties of PP, found that the tensile strength of PP composites has beendecreased, but the toughness and thermal resistance of PP composites has beenimproved. Using POE as the Toughening agent of PP composite material,results showed that the tensile strength of blends has been decreased, but thetoughness and thermal resistance of blends has been improved. When PP100phr, surface modification of talcum powder30phr, POE5phr, compared withpure PP the porperties of composites has been improved. for instance, notchedimpact strength increased4.3KJ/m~2, vicat softening point increased has been5℃, deflection temperature has been increased31.9℃, peak crystallizationtemperature has been increased16.2℃, initial weight loss temperature andwhen the weight loss50%temperature have been increased35℃and15℃,got a kind of excellent comprehensive properties of PP composites whichthermal resistance and toughness is improved greatly, and strength decreasesslightly.