Styrene (ST)/1

3-pentadiene (PD) can undergo anionic polymerization to synthesize a special alternating sequence copolymer (SP) with BuLi as initiator. Interestingly

the multi-block copolymer based on this unique alternating sequence has great application value in the fields of high impact resistant

high transparent and toughened resin and so on. Furthermore

the polarity-modification of unsaturated polyolefin materials is of great research significance

for example

improving the compatibility and heat/weather resistance as well as transparent characteristics. In this paper

m

-CPBA was used as the epoxidation reagent to study the epoxidation modification of SP. The effects of reaction temperature

solvent

SP molecular weight and epoxidation reagent on the epoxidation reaction were investigated in detail. The resultant epoxidation product (eSP) was characterized by proton nuclear magnetic resonance (

1

H-NMR) and Fourier transform infrared spectrometry (FTIR). In addition

the quantitative analysis method of eSP with different epoxidation degrees was well established

and the optimal reaction conditions were determined through orthogonal experiments: tetrahydrofuran (THF)/cyclohexane (CH) as solvent

T =343 K

n

(C=C)/

n

(

m

-CPBA)=1∶1.25

t

=60 min

which can realize the complete epoxidation of SP. Finally

T

g

s of eSPs with different epoxidation degrees were analyzed by differential scanning calorimeter (DSC)

which proved that epoxidation could significantly improve the polarity of products and the service temperature of polyolefins.