Method for making tropism film, tropism film and film polarimeter and front dispersion diffuser
A technology of oriented films and films, applied in polarizing elements, diffusing elements, instruments, etc., can solve the problems of low birefringence optical properties and achieve the effect of large component flexibility
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Embodiment 1-2
[0098] A polymer blend containing 70 mole % PEN homopolymer and 30 mole % PET homopolymer was extruded and cast into films. In Example 1, the I.V. of PEN was 0.56, and the I.V. of PET was 0.60. The I.V. of the final copolymer was found to be 0.535. The degree of randomness is 23.4%. In Example 2, the I.V. of PEN was 0.56, and the I.V. of PET was 0.85. The I.V. of the final copolymer was found to be 0.560. The degree of randomness is 30.9%. The flakes in Examples 1 and 2 were both transparent.
[0099] The flakes of Examples 1-2 were oriented in a manner similar to the film of Comparative Example 2, and their corresponding stress-strain curves were determined. The stress-strain relationships for Examples 1 and 2 are shown in Figure 1 as curves B and C, respectively. The copolymer of Example 1 has a slightly lower intrinsic viscosity and less randomness than the copolymer of Example 2, and exhibits slightly earlier strain hardening. The difference between curves B and...
Embodiment 3
[0106] Films were prepared as in Comparative Example 1, except that the coPEN copolymer was replaced by the blend of PEN and PET homopolymer of Example 2. The degree of randomness of the cast film was 8.7%. The cast film was first oriented in the machine direction to a stretch ratio of 1.25:1 using a conventional length orientator. It was then stretched in the transverse direction at 118°C (245°F) to a stretch ratio of 5.1:1. The on-axis gain is 43.8%. The 40° gain is 20.1%.
[0107] Relative to Comparative Example 1, this example demonstrates that a mixture of homopolymers and / or a lower degree of randomness can be used to achieve an increase in on-axis gain.
Embodiment 4
[0109] The film was made according to the method of Example 3, except that the PEN and PET homopolymers were the PEN and PET homopolymers in Example 1. The degree of randomness of this sample was 10.8%. The on-axis gain is 42.8%. The 40° gain is 19.2%.
[0110] By comparing Example 4 and Example 3, it can be seen that under a fixed degree of randomness, almost the same composition and process conditions, increasing I.V. means increasing gain.
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