Method for making optical devices from homopolymers
A technology of optical devices and homopolymers, applied in optical components, optics, instruments, etc., can solve the problems of low birefringence optical characteristics, etc., and achieve the effect of large component flexibility
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Embodiment 1-2
[0085] A polymer blend containing 70 mol% PEN homopolymer and 30 mol% PET homopolymer was extruded and cast into a film. 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 determined 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 determined to be 0.560. The degree of randomness is 30.9%. The sheets in Examples 1 and 2 are both transparent.
[0086] The sheet of Example 1-2 was oriented in a manner similar to the film of Comparative Example 2, and the corresponding stress-strain curve was determined. The stress-strain relationship of Examples 1 and 2 is figure 1 Denoted as curves B and C respectively. The copolymer of Example 1 has a slightly lower intrinsic viscosity and a lower degree of randomness than the copolymer of Example 2, and exhibits slightly earlier strain hardening. The difference between curves B and C may ...
Embodiment 3
[0093] The film was prepared according to the method of Comparative Example 1, except that the blend of PEN and PET homopolymer of Example 2 was used instead of the coPEN copolymer. The randomness of the cast film was 8.7%. First, the cast film was oriented along the machine direction with a traditional length orientation instrument to a stretch ratio of 1.25:1. 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%.
[0094] Compared to Comparative Example 1, this example shows 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
[0096] The film was made according to the method of Example 3, except that PEN and PET homopolymers were the PEN and PET homopolymers in Example 1. The randomness of this sample was 10.8%. The on-axis gain is 42.8%. The 40° gain is 19.2%.
[0097] By comparing Example 4 with 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. Example 5
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