| Toughening Effect of Modified NR Powder on SAN |
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| DOI： |
| Key Words: PMNR；SAN；blend；toughening effect；impact strength |
| Author Name | Affiliation | | Wang Lianshi | South China University of Technology | | Hu Xiaochang | South China University of Technology | | Zhou Yiyu | South China University of Technology | | Cai Tongmin | South China University of Technology |
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| Abstract: |
| The modified NR powder(PMNR)with the particle size less than 0.9 mm was blended with styrene-acryloni trile copolymer(SAN).The mechanical properties of the blends and the influence of PMNR on the impact strength of blends were investigated.The results showed that PMNR had an excellent toughening effect on SAN.When 30 phr(by mass)of PMNR with the solubility parameter δ of 9.49，in which the swelling index of crosslinked NR and the mass proportion of vinyl chain were 10.9 and 0.20 respectively，was used，the blend having an unnotched Charpy impact strength of 60 kJ·m-2 or so was obtained.It was found from the analysis of the impact cross-section on SEM that the toughening mechanism was mainly the shear yielding with some degree of multiple crazings. |
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