Based upon the DSC

DMA

TEM and SEM observation

a study was made on the structure and property of ethylene-propylene diene monomer(EPDM)／ternary-nylon-copolymer(nylon6／66／1010=20／10／70)(PA) blending systems with excellent properties．The results show that there are three kinds of structure such as lollows：After EPDM

PA and chlorinated polyethylene (CPE) being melt blended in 160℃

disperse particles

composed of PA and CPE would be formed．Because of chemical reaction

CPE anchored or inserted into PA The junior structure refers to dispersed particle itself It reduces the polarity of PA and improves the compatibility of PA and EPDM．On the other hand

it makes modulus and crystallinity of PA closer to those of EPDM．Some special treatment changes the shape of dispersed particles into a micro-fiber(intemadiate structure) that could reinforce the EPDM matrix with smaller amount of PA Also

it could improve magnificently the tear strength

especially hot tear strength of EPDM．EPDM／PA blend

named as micro-fiber rubber compound

has much better elongation at break than short-fiber rubber com Dound and the reason has been given Only under the effect of external force

the senior structure

which is composed of aggregation bodies

comes into being．Each aggregation body

which could be proved by analysis of SEM observation of surfaces of fractured specimen

includes certain amount of micro-fibers It is these sophisticated structures that make the blending system embrace merits of both EPDM and PA and gain excellent comprehensive properties．Compared with main properties of rubber compound cited in hterature．EPDM elastormer reinforead by nylon has satisfactory mechanical properties and excellent heat and oxygen．resistance properties．