The cyclopolymerization of non-conjugated

-dienes such as 1

4-pentadiene

1

5-hexadiene

1

6-heptadiene

1

7-octadiene and 1

9-decadiene and their copolymerization with ethylene by scandium complex [(C5Me4SiMe3)Sc(CH2C6H4NMe2-o)2/[Ph3C]B(C6F5)4]] have been examined.Polymerization conditions and the structure of non-conjugated

-dienes have an important influence on the catalytic activity and selectivity

polymer products molecular weight and molecular weight distribution. Except for 1

9-decadiene homopolymer which is an insoluble cross-linked polymer

the homopolymerization of 1

5-hexadiene

1

6-heptadiene

and 1

7-octadiene has been achieved to affords soluble cyclopolymers materials.Under the optimum conditions

the homopolymerization of 1

5-hexadiene affords cyclopolymers containing methylene-1

3-cyclopentane (MCPN

83%) units and 3-vinyltetramethylene (VTM

17%) units.In the case of 1

6-heptadiene homopolymerization

a soluble cyclopolyolefin containing both six-member ring methylene-1

3-cyclohexane (MCHX

91%) units and five-member ring ethylene-1

2-cyclopentane (ECPN

9%) units is obtained.However

the homopolymerization of 1

7-octadiene afford a homopolymer containing seven-member ring methylene-1

3-cycloheptane (MCHP

57%) units and non-cyclic pendent double bond units (HEB

43%).By use of this scandium catalyst

the copolymerization of non-conjugated

-dienes such as 1

5-hexadiene

1

6-heptadiene

1

7-octadiene and 1

9-decadiene with ethylene (1.01105 Pa) has also been achieved to afford relatively high molecular weight novel cyclocopolymer materials that contain polyethylene units

cyclic structure units or non-cyclic pendent double bond units.In the same copolymerization conditions

1

5-hexadiene and 1

6-heptadiene polymerization form cyclic structure units

while the 1

7-octadiene and 1

9-decadiene polymerization form non-cyclic pendent double bond units.The incorporation of 1

5-hexadiene or 1

6-heptadiene in the corresponding copolymer is higher than that of 1

7-octadiene or 1

9-decadiene.