Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   JANUARY 2011 , Volume 20 , Number 1 (127); Page(s) 55 To 63.
 
Paper: 

SYNTHESIS AND CHARACTERIZATION OF EPOXIDIZED ACRYLATED NATURAL RUBBER CROSS-LINKED BY STAR-SHAPED POLYSTYRENE

 
Author(s):  ZHANG X., CHEN L., ZHANG Q.*, HUANG Y., LI J.
 
* HAINAN PROVINCIAL KEY LABORATORY OF FINE CHEMICALS, HAINAN UNIVERSITY, HAIKOU 570228, P.R. CHINA
 
Abstract: 

The epoxidized acrylated natural rubber cross-linked by polystyrene was synthesized to produce star-shaped functional rubber by iniferter polymerization. The synthesis was carried out in several steps. The epoxidized acrylated natural rubber was first obtained by grafting of acrylic acid onto epoxidized natural rubber, and then photocross-linking reaction was performed with polystyrene using star-shaped polystyrene iniferter as a photoinitiator under UV irradiation. The starshaped polystyrene iniferter was prepared using 1,3,5-tris(ethyldimethylcarbamodithioate)-2,4,6-trimethylbenzene as an initiator. The structure and morphology were characterized by FTIR, 1H NMR, SEM, GPC and AFM. The characterization results of FTIR and 1H NMR showed that the desired products and structures were successfully obtained. SEM Results revealed that polystyrene microballoons were grafted to the epoxidized acrylated natural rubber. GPC Results demonstrated that the number average molecular weight (`Mn), weight average molecular weight (`Mw) and polydispersity of the star-shaped polystyrene iniferter using as photoinitiator are calculated as 920, 1340 and 1.46 in the above order. AFM Results suggested that polystyrene was uniformly distributed throughout the epoxidized acrylated natural rubber. The thermal performances of the product were evaluated by TG/DSC and the results indicated that the product exhibited good thermal stability. The paper presents a new route to prepare a star-shaped epoxidized acrylated natural rubber cross-linked by star-shaped polystyrene and provides a convenient manufacturing operation for those elastic sealing materials using in special complex-shaped parts.

 
Keyword(s): EPOXIDIZED NATURAL RUBBER, ACRYLATE, INIFERTER, POLYSTYRENE, MODIFICATION
 
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