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Citation: XU Miao-Qing, HUANG Jian-Ying, YAN Ming-Fa, LIN Qiang, LIN Ming-Hua, CHEN Yi-Hong, ZOU You-Si. The Rate-accelerating Additives for Living Free radical Polymerization of Styrene in the Presence of Sodium Nitrite and Iron(Ⅱ) Sulfate[J]. Chinese Journal of Applied Chemistry, ;2005, 22(9): 1017-1020. shu

The Rate-accelerating Additives for Living Free radical Polymerization of Styrene in the Presence of Sodium Nitrite and Iron(Ⅱ) Sulfate

1.
a Department of Chemistry, Quanzhou Normal College, Quanzhou;
2.
b Department of Material Science, Xiamen University, Xiamen 361000

Corresponding author: ZOU You-Si,
Received Date: 8 October 2004
Available Online: 16 February 2005

The rate-accelerating additives for living free radical polymerization of styrene in the presence of sodium nitrite and iron(Ⅱ) sulfate were studied.It was found that the styrene polymerization mediated with AIBN/NaNO₂/FeSO₄·7H₂O was distinctly accelerated by the additive,such as diethylmalonate(DEM),acetylacetone(AAT),ethyl acetoacetic ester(AAE),or malonoitrile(MN).Among those additives,(malonoitrile)(MN) showed the best effect of rate enhancement and maintained the character of living free-radical polymerization while accelerating the rate of the polymerization.The conversion reached 80.0% within 5 h at 120℃ when n(MN):n(NaNO₂):n(FeSO₄·7H₂O)=4:1:1 and [MN] equaled 0.312 mol/L.The polymerization rate was twenty times as fast as that of the polymerization without any additives.The molecular weight distribution was narrow,and the molecular weight was well controlled under 4×10⁴,and the difference between the theoretical molecular weight and the experimental molecular weight was below 20%.With the increase of the conversion of monomer,the molecular weight of the polymer also increased linearly.The spectrum of ¹H NMR show that MN didn't alter the structure of the polymer and only acted as an accelerator.
- malononitrile(MN),
- living free radical polymerization,
- stable radical,
- rate-accelerating additive
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