0000006335 00000 n <> 16 0 obj ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Refractive index modulation in the polyurethane films containing diazo sulfonamide chromophores. <> Also, from the dependence between the specific refractive index increments and the weight fraction of 4,4′-methylene diphenylene diisocyanate units, w d , the ν0 and dν/dw d coefficients have been evaluated and the results are situated between the values reported in literature. 160 NAME EL42 EL60 EL70 EL85 SR40 SR60 Tensile Strength (Mpa) 1.72 2.38 5.03 7.34 6.4 7.4 Elongation To Break 200% 235% 175% 250% 380% 350% Flexural Strength (Mpa) - - Flexural Modulus (Mpa) - - Shore Hardness 42A 60A 70A 85A 40 A 60 A … <> 17 0 obj 6 0 obj Specific refractive index increments of these segmented copolymers in N,N-dimethyl-formamide have been determined by the Lorenz-Lorentz equation and the corresponding group contributions to the molar refraction and to the molar volume. It modifies water soluble resins and emulsions which can be used in automotive coating applications. endobj It was found that photocurrent was generated in the polymer films deposited onto indium tin oxide (ITO) glass plates. endobj 3 0 obj endobj ��e�(�D”e��o��.�y���`G��?\4�� T]=�Q4�I��rVU%�R� �{��懽l0�X��E��M$� ejmSG�l*�+l�˒D.ۤ�����G�l�TJ*W�T�^� c_��/�-�i�x�|��_ذ���9�b�d����^u�-+UT��Q�����٠���&��A�]�-"� ����^���dw`7�¼���njo�JL�v�f9A���P�y� �m��C�春h-��7�jT:~���lz��:�q�؟2ڰM��)�M��Q@��x���UY�N3��C*���s�F]�o�Pf��x�FM��h����ͦ�}̮����4��܎o�-T��~I3�Q�O�T�� endobj 0000002624 00000 n Initially, bicarbazole phenoxy (BCP) derivatives were synthesized by the reaction between 9-(2-oxiranylmethyl)-9H-carbazole and 4,4′-(1-phenylethylidene)bisphenol. 12% for the derivatives of sulfamethoxazole. ���n6{_4��e"�T\0�?E>K������fC25 �����I���T|l6rL�K����%�f�\��7� $p��?C�#nY��q�L쁼HY-¼b!c!DVJ���vQ�H�\��`����Ɣ�:%�E)x���v��L˝,��|a�դ�A��س�7��=�΀wD��O���wwX�A�r�_���)�T����~5��J�ao�D�q��0���M���y�=�ξ��ݎ�!_o>�a�z\��ێ��ڤԆ Z������gȦ���Ky��. 3099067 Most of the urethane acrylate prepolymers prepared in this study could be applied in the formulation of primary optical fiber coating and exhibited good properties of buffer functions, including low glass transition temperature, low modulus even at low temperature, say, below −40°C, high refractive index, and low viscosity. 12 0 obj Molecular Crystals and Liquid Crystals 2017, 659 (1) … endobj 5 Howick Place | London | SW1P 1WG. 43 0 obj <>stream <> <> endobj SPECIFIC REFRACTIVE INDEX INCREMENTS OF .... Polyurethane/polydimethylsiloxane segmented copolymers. The refractive index is of practical importance in the case of Desmopan® in so far as, when compounded in blends, TPU will only produce a transparent compound if the refractive indexes of the different compounds are fairly similar. The change of real part of the refractive index was in the range of 0.0033–0.0296 depending on the polymer kind and chromophore content. 3099067 Initially, bicarbazole phenoxy (BCP) derivatives were synthesized by the reaction between 9-(2-oxiranylmethyl)-9H-carbazole and 4,4′-(1-phenylethylidene)bisphenol. 0000002921 00000 n 0000005957 00000 n 0000006464 00000 n Refractive Index Elastic Modulus (psi) 160 190 915 2700 Max Cast Thickness (mm) - - - - - - Min Cast Thickness (mm) 1.8 1.8 1.8 1.8 - - Min Features (mm) 1.0 1.0 1.0 1.0 Simulates 42A 60A 70A 85A 40A Sili 60A Sili PU ELASTOMERS SILICONES Polyurethane (PU) thin films were deposited on glass substrates by spin.The optical properties of the prepared thin films are studied. ELASTOMERS - POLYURETHANE (PU), & SILICONE MATERIAL DATASHEET RANGE. Refractive Index @ 25°C 1.48 Flame Retardency No Loss Tangent @ 50 Hz 0.025 Permittivity @ 50 Hz 3.50 Comparative Tracking Index Not Measured Water Absorption (9.7mm thick disk, 51mm diameter) 10 days @ 20ºC / 1 hour @ 100ºC < 1% / < 2% Elongation At … 19 0 obj Refractive index (RI or n) is of critical importance for photonics applications such as optical waveguides and ophthalmic devices.Based on their unique refractive index characteristics and good optical clarity, polymeric materials are also used as anti-reflective coatings for solar cells, displays and contact lenses. https://doi.org/10.1016/j.tsf.2004.12.011. x��X�nI}G��i������"{���V�$���ލo'����13��f���9U�U����L�秣�){��ݙNG��O��v~u���������������=��kJM{���x��{���������k���k. '��,�37��JL�,e�|��$��$���@�� ����~�祙uM]n�̉x&��M�u%�k�R�$>�q�E��u�-O�OE�h�6�I�ŲO�Ȼq�0G���8R�������'4�V�|/�jVۙ������ݵˢ���1,� ����+�*��V�B�ŻB25�S�O�?I��X�t�QiHW��(��u^�v��^����@��4�D����^$���--,��� n'\oV�,nS�JG����Kq�Z�p�o���$A˧��)N��m�⺘��kO�x%Be�� 0000002363 00000 n refractive index n 20/D 1.47 viscosity 8,000 cP(25 °C)(lit.) 20 0 obj %PDF-1.7 <>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 841.92 595.32] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> By continuing you agree to the use of cookies. 5 0 obj 10 0 obj refractive index n 20/D 1.47 viscosity 8,000 cP(25 °C)(lit.) The refractive indexes of aromatic Desmopan® grades range from 1.52 to 1.57, depending on their formulation. endobj endobj �.��[��oe��.Pv)���~�.q��� endobj Wa/���:��]=��ջ �OG���ex`t(��&ʍ The series of photochromic polyurethanes was obtained by modification of precursor polymers prepared from 4,4′-diphenylmethane diisocyanate (MDI), hexamethylene 1,6-diisocyanate (HDI) or toluene 2,4-diisocyanate (TDI) and N,N'-di-(2-hydroxyethyl) aniline. endobj 0000001339 00000 n endobj endobj Copyright © 2004 Elsevier B.V. All rights reserved. endobj For the polyurethanes containing sulfathiazole groups in side chains the current density was up to 180 nA/cm2. The CPP solution was spin-coated on a silicon wafer and dried under nitrogen. <> 4 0 obj High-index plastics Lenses Material (polyurethanes) ( Helpful:2 ) Back » *Refractive index (nd): 1.640–1.740 *Abbe value (Vd): 42–32 (higher indexes generally result in lower Abbe values) The results are in good agreement with the experimental values. The transmittance of the CPP film was almost 100% as analyzed by a UV-visible spectrometer and the refractive index of the polymer was 1.63 as measured by spectroscopic ellipsometry. <>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 841.92 595.32] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 23 21 The results are in good agreement with the experimental values. 3 0 obj © 1992 John Wiley & Sons, Inc. The precursor polymers were functionalized by an azo-coupling reaction to form the polymers with different degrees of functionalization and various heterocyclic sulfonamide groups. Registered in England & Wales No. endobj endobj We use cookies to improve your website experience. }I���VF�؊,��`�3���ek-�֜մB��aC2��-��74-].Z�B���1��݋��X)�{�*�����+�c����a�@��YB����m�����^V���od7$6�U=$o�H˵w��� l!~o)=�~�x���ܒ 14 0 obj acid number 0.6 mg KOH/g(dry basis) ... Polyurethane diol solution (PUD) is a synthetic polymeric solution that is used as a modifier that is formed by condensation of isocyanates and polyalcohols. 0000001760 00000 n Specific refractive index increments of these segmented copolymers in N,N-dimethyl-formamide have been determined by the Lorenz-Lorentz equation and the corresponding group contributions to the molar refraction and to the molar volume. acid number 0.6 mg KOH/g(dry basis) hydroxyl value 350 mg KOH/g(dry basis) solubility H 2 O: soluble density 1.14 g/mL at 25 °C 0000000716 00000 n 8 0 obj The step-growth polymerization of BCP and isophorone diisocyanate took place at 80°C in the presence of dibutyltin dilaurate as a catalyst affording the prepolymer with isocyanate end-groups. <> endobj The polymer was characterized by 1H NMR, FT-IR, and GPC. 0000000948 00000 n x��XmoG����O�e�o��"����YUe����6~)ƍ���̞cw.����>�����^�;�]]��f��m�;�������I�����)��M:�����xvu{�=�>㦃��|2}�����Q�����}�������O�֤�)���t�l\�i6�.E�'�Jl��p: