W�`{�����;�G�a�Yh���0�ۂo4��X@�����փ�]P�Y7S&6${�n����{�QIAV~C9I< �sfz�2��q���:@#>�L�lBZMa*��+B����T�����7c�E�"=3��r�v�� ��V��i��/���Wݏ&�8e�������-��,��FSl*�Y̼`�7���k�����gO�?ְ�������fR endobj H���Mo�0����9��������J��R�e{@�ݥZ>l���Θ D�h��x5�y��� �7ϗBJ@V���'��+���l�=��)��\�������#� ���~�,�. � ��� H-C-H Asymmetric & Symmetric Stretch stream Aging of epoxy (EP)-metal-joints is studied by FTIR microspectroscopy, tapping mode scanning force microscopy and nanoindentation on sample cuts prepared with low angle microtomy. The IR spectra of 40% acetone solutions of epoxy resins with different molecular mass were studied. 18 0 obj Polymer-Plastics Technology and Engineering: Vol. A new reaction of unsaturated fatty acid hydroperoxides: Formation of 11-hydroxy-12,13-epoxy-9-octadecenoic acid from 13-hydroperoxy-9,11-octadecadienoic acid. interactio n OH groups and carbon fibe r. <> � ��� stream stream Figure3 shows the FTIR spec-tra of pre-epoxy, epoxy and ETN materials (ETN1-1, ETN1-11 and ETN1-33). endobj x�3R��2�35W(�*T0P�R0T(�Y@���@QC= P A�J��� �14Vp�W� Infrared spectrophotometers (FTIR) provide an effective measurement method for tracking such changes, as they offer the ability to simultaneously track the changes of multiple absorption peaks. 32 0 obj /Contents 26 0 R>> � ��� O!n�4��{�k�P����� p�U{��P6\�F�R�����@1���ꪗ�~J�S[����(�VrV�ޞ�-�F�j$��Ev �������mX^ ����$�*Ā\�o�8�#M�B��.05U>U��/�������Q�V�_D�I��y�G��D�_�K�8�T,P����\���$C"n�8��6��W�m�ڂu��ڃ�? From the FTIR spectrum of uncured epoxy resin presented in Fig. endobj <> � �p� /Contents 20 0 R>> endstream endobj 134 0 obj<>stream (PȰ��IM��d�����+<��ij&�ϛ�Zx�RB,�0y�KW�F��m�X��#��/��O9��lt���R����� c/eWu��k���Y�e�P��������` � ��� Functional Group Names & Example compounds Absorption Ranges(cm-1) [Look for a single absorption in these regions, unless stated otherwise.] B��P���.�2��FU��U-������BL#7�����嬗�z̍��*���t��c�z�����ʫ+,���nT!��Mҁ�r���2����ī��2�Vt�^�χ�n�>��\��@��Y����?�y3 ߾���6)��L���XX��EÍ��7�*f��kQ��Q��8�um�_ſ/�(f�~%h��C�z������ x����x�Q���CQ��y���ѻ����T���ҏd��Un�� ����� pw�s�^�9���0�l����~w����e�F� Meanwhile, the plateau region in the curves reflects the final conversion of epoxy groups after irradiation,. <> <> These SE and their ingredients were analyzed using FTIR transmission techniques (KBr pellets, pyrolysis without control and controlled pyrolysis-FT-IR, the CONTROLPIR/FT-IR) for characterizing the curing agents (CA). 0000002023 00000 n 0 0.5 1 1.5 0 10 20 30 40 50 60 70 o Exposure time (min) Carbamate/ Epoxy 21 endstream 0000007951 00000 n endobj stream stream functional groups or disappearances of existing ones. agent for epoxy group of GLYMO. <> 39, No. endstream 0000008869 00000 n ��ަh�H��,8����v���|�IdC"g�'�{$�S�+eC�4��Y endobj endobj 0000003776 00000 n � ��� 52 0 obj 0000000914 00000 n <> � � � x�3R��2�35W(�*T0P�R0T(�Y@���@QC= P A�J��� �14Tp�W� 0000024442 00000 n The main feature of the epoxy monomer is the oxirane functional group, which is a three member ring formed between two carbon atoms and an oxygen, as shown in Figure 1. x�3R��2�35W(�*T0P�R0T(�Y@���@QC= P A�J��� �1Up�W� <> <> 30 0 obj <> endobj stream 15 0 obj An iodonium salt is used as a photoacid generator to initiate crosslinking reactions. endobj This atomic arrangement shows enhanced reactivity when compared with common ethers because of its high strain. endstream main chemical reactions that take place (Figure 1). H��S�n�0��s�W�M#U=��J��J=�V�`�^�5&I�~gj�ڦ���yo��X��D"���,!�m� yq���u�Œ���~�J�K }�N`��No��F�校AX� endstream When polymer materials are heated, irradiated with light, or mixed, some of the molecular structures can undergo changes that are a function of time. It’s advantage is that it can track multiple absorption peaks at the same time. epoxy ring and primary amine is the exclusive one occurring in the presence of primary amine. endstream endobj 136 0 obj<>stream endobj <> • Rapid increase, peaking at 15min exposure time, then stable or slight decrease. stream stream /Contents 34 0 R>> <<816A5341002D5A4297104B8BD093884B>]>> x�bb�b`b``Ń3΅� �� endobj 49 0 obj FTIR analysis confirmed the cross-linking structure in the cured adhesives. �����?�R2܊i��2��(�%��FX���s*>�&�2�B��I�����=;�͈��4W���4��r.���y�,��lT�`g���Z������#����>�0�Ȣ����]}K���o �y�f�Z9P{���8x�I � FT-IR technique is used generally to investigate the curing processes of epoxy resin [1-4], which can identify qualitatively the reaction group in curing reaction of epoxy resin. endobj The hydroxyl groups formed during the ring opening of the oxirane ring accelerate the epoxy-amine reaction, resulting in typical autocatalytic behavior. <> xref endobj Atomic force microscopy was used to observe the changes obtained with the modification… <> endobj Synthesis, Characterization of Coatings Based on Epoxy Novolac 1257 substituted aromatics. � ��� 6 0 obj � ��� /Contents 46 0 R>> ... reaction group s in epoxy molecul e, the 2360 cm. endstream endstream x�3R��2�35W(�*T0P�R0T(�Y@���@QC= P A�J��� �12Pp�W� endstream an examination of the literature concerning water interactions with epoxy resins was undertaken. Epoxy resin (ER) was modified with four different epoxide compounds, 4,5-epoxy-4-methyl-pentane-2-on (EMP), 3-phenyl-1,2-epoxypropane (PhEP), 1-chloro-2,3-epoxy-5-(chloromethyl)-5-hexene (CEH), and a fatty acid glycidyl ester (FAGE), to improve its chemical and physical properties. �B1h�B�*'Of%�����[�z�)�_���w��S��~xP�ۇ�=h�cW���]����+����1�u�^>>��u���|6�Ͼ{��ờ�cv�������pU���^��?��F�e��+C3L2=^rp�ǫ�`�_�4!ٜw�y��b\����S�����Q\����n�K�}�}�C~S���'����W)ں�v8��Q��7�Z{�w/ŠoŘ?����h�͜gq-�|#�+�iY�e��Q��q�a�n��I�{�6�Մ>*広N��doX� � �g� <> <> 9 0 obj <>>>] Different molecular bonds absorb different wavelengths of infrared light. � �x� 41 0 obj � �y� Applications of FTIR on Epoxy Resins – Identification, Monitoring the Curing Process, Phase Separation and Water Uptake 269 Although the N-H stretching is located between 3500 and 3300 cm-1, primary amines show a doublet (reflecting the symmetric and antisymmetric stretching modes) while the secondary amines show one single band. /Length 5957 >> Simple epoxides are often referred to as oxides. endstream Infrared /Contents 40 0 R>> The effects of the addition and amount of these modifiers on mechanical, thermal, and coating properties were investigated. 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