Table 2 Polymer characteristics of non-degraded (control) polyurethane films and films incubated in degradation media for a period of 6 months.

From: Controllable degradation kinetics of POSS nanoparticle-integrated poly(ε-caprolactone urea)urethane elastomers for tissue engineering applications

 

Degradation buffer

Tg (°C)a

Tm (°C)a

Tensile strength (MPa)

Breaking strain (%)

Initial modulus (MPa)

χ(%)a

Mn (x 104) g/molb

M w /M n b

Contact angle (°)

Soft s.

Hard s.

Soft s.

Hard s.

PCLU-24

Control

−54.8

51.1

—

—

11.6

342.7

8.1

—

11.5

1.7

86.4

 

PBS

−55.4

41.7

—

—

15.4

444.6

5.8

—

11.9

1.5

91.5

 

Lipase

−50.4

14.8

38.8

47.7

—

—

—

17.2

1.0

2.0

—

 

Collagenase

−55.1

—

43.7

—

12.6

495.9

28.1*

0.4

10.4

1.7

91.7

 

CE

−55.9

0.0

41.4

—

11.5

482.8

11.6

2.1

7.6

1.8

87.6

 

H2O2 + CoCl2

−23.5

—

46.4

—

—

—

—

37.3

0.6

1.9

—

POSS-PCLU-24

Control

−52.9

40.8

—

—

16.2

456.1

6.3

—

11.9

1.4

105.2

 

PBS

−56.7

39.4

—

—

12.5

439.8

5.4

—

10.4

1.5

97.3

 

Lipase

−49.4

14.4

39.5

51.8

—

—

—

19.4

1.0

1.9

—

 

Collagenase

−54.9

—

41.8

—

19.1

515.7

21.8*

0.4

9.2

1.6

82.0

 

CE

−56.8

—

41.4

—

13.1

441.8

9.1

1.3

7.6

1.7

91.8

 

H2O2 + CoCl2

−24.3

—

45.8

52.7

—

—

—

35.8

0.5

1.8

—

POSS-PCLU-28

Control

−55.4

52.5

—

—

14.1

351.6

11.4

—

—

—

102.4

 

PBS

−56.3

52.5

—

—

16.6

389.9

8.2

—

—

—

99.2

 

Lipase

−51.7

12.8

37.8

48.7

—

—

—

9.3

0.8

1.9

90.0

 

Collagenase

−52.6

—

39.4

50.2

8.5

286.6

109.3*

9.0

13.4

2.1

85.6

 

CE

−56.5

53.8

—

—

21.4

492.8

8.8

—

—

—

97.1

 

H2O2 + CoCl2

−46.8

—

37.7

49.3

—

—

—

6.6

0.7

2.0

—

POSS-PCLU-33

Control

−55.5

54.1

—

—

20.7

355.5

24.1

—

—

—

106.3

 

PBS

−56.2

52.1

—

—

20.4

389.6

17.3

—

—

—

91.5

 

Lipase

−54.4

11.5

39.5

49.4

   

3.4

—

—

73.7

 

Collagenase

−56.3

—

—

—

24.4

393.6

22.5

—

—

—

84.9

 

CE

−56.4

—

—

—

18.3

419.6

13.9

—

—

—

—

 

H2O2 + CoCl2

−44.8

—

40.2

51.9

—

—

—

11.8

0.7

1.9

—

  1. Key: POSS, polyhedral oligomeric silsesquioxane; PCLU, poly(ε-caprolactone urea)urethane.
  2. aχ was determined by DSC.
  3. bMn and Mw/Mn were determined by GPC. − = Values unavailable as samples did not dissolve in DMAc which suggests insignificant degrees of degradation.
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