Table 1 Conditions optimization for the copolymerization under visible-light irradiationa

From: Photoredox-controlled alternating copolymerization enables highly crystalline structures and block copolymers from thermoplastic to elastomer

Entry

PC

CTA

[ethylene]/[CTFE]

Mn,SECb (kDa)

Đb

Yieldc (g)

Tmd (°C)

χcd (%)

1

PC1

1-3

1/1

9.5-17.8

1.78-2.12

0.83-1.12

203.8-210.9

36.2-44.1

2

PC1

4

1/1

9.0

1.52

0.85

201.2

35.8

3

PC1

5

1/1

4.7

1.46

0.51

195.2

27.5

4

PC1

6

1/1

8.3

1.43

0.98

201.8

50.3

5

PC1

7

1/1

7.0

1.52

0.35

200.2

30.5

6

PC1

8/9

1/1

4.5/-

1.45/-

0.26/-

197.4/-

34.2/-

7

PC1

10

1/1

14.1

1.29

1.46

220.6

65.6

8

PC1

11

1/1

12.6

1.37

1.19

216.5

63.9

9

PC1

12

1/1

11.8

1.32

0.88

214.2

48.1

10e

PC1

10

2/1

12.0

1.34

1.19

202.3

49.2

11f

PC1

10

1/2

13.8

1.32

1.05

215.9

58.9

12

PC2-PC4

10

1/1

9.6-11.2

1.33-1.45

0.88-1.28

204.3-208.2

38.5-46.9

  1. aReaction conditions: [ethylene]/[CTFE]/[CTA]/[PC] = 300/300/1/0.01, white LED bulb (~50 mW/cm2), 25 °C, 6 h, DEC/DMC solvent (v/v = 2/1), glass thick-walled Schlenk tubes (3.6 atm). P1-P4 are photocatalysts, and CTA 1-12 are chain-transfer agents.
  2. bDetermined by SEC in 1,2,4-trichlorobenzene solvent at 160 °C. Mn,SEC, and Đ represent the relative molar masses and dispersity measured by SEC.
  3. cYields of polymers are average values of three runs, which were determined by isolation.
  4. dDetermined by DSC. Tm and χc represent the melting point and crystallinity (melting enthalpy of complete crystalline ECTFE is 132 J g-1).
  5. e[ethylene]/[CTFE]/[CTA]/[PC] = 400/200/1/0.01.
  6. f[ethylene]/[CTFE]/[CTA]/[PC] = 200/400/1/0.01.
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