Forming optically anisotropic pitches
WebI. Mochida, L. Ling and Y. Korai, Some factors for the high performances of mesophase pitch based carbon fibre, J. Mater. Sci., 29, 3050–3056 (1994). CrossRef CAS Google Scholar T. Matsumoto, Mesophase pitch and its carbon fibers, Pure and Applied Chem., 57[11], 1553–1562 (1985). WebJul 12, 2024 · Pitch samples produced through vacuum treatment in addition to the thermal condensation showed different compared with the samples of 400D3, 430D3, and 430D5: higher anisotropic content and softening points but low pitch yields. Polarized optical microscopic images of 400D3V, 430D3V, and 430D5V are represented in Fig. 2. …
Forming optically anisotropic pitches
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WebIn the process for preparing an optically anisotropic deformable carbonaceous pitch containing greater than 75% of an optically anisotropic phase by heating an isotropic … WebIn the process for preparing an optically anisotropic deformable carbonaceous pitch containing greater than 75% of an optically anisotropic phase by heating an isotropic carbonaceous pitch to...
WebJan 1, 2002 · The aim of the present study is to explore the feasibility of producing C–BN alloys via a mesophase route analogous to that for conventional carbon materials. This requires the synthesis of suitable precursor compounds which have the potential to form optically anisotropic liquid crystalline products via thermal conversion. WebThis patent describes an optically anisotropic carbonaceous pitch having a sufficiently low melt-spinning temperature. The pitch contains the optically anisotropic phase within …
WebForming optically anisotropic pitches - Patent US-4208267-A - PubChem Apologies, we are having some trouble retrieving data from our servers... PUGVIEW FETCH ERROR: … WebGB-2002024-A chemical patent summary.
WebThere are two distinct types of pitch-based carbon fiber available commercially. There is the “General Purpose” fiber, which has a tensile strength of up to 700 MPa and modulus of 30 to 60 GPa, and the “High Performance” fiber, which has tensile strength up to 4 GPa and modulus from 180 to 900 GPa.
WebJan 10, 2024 · The anisotropic texture of pitch precursor develops phenomenalistically in various stages of generation, growth, coalescence of anisotropic particles, and is finally converted into 100 vol.% anisotropy. … rechner pace kmhWebJun 15, 2024 · Anisotropic texture was first observed with pitches that had been annealed at a weight ratio of 3/7. With increasing AR-THFI content, the optical structure … unlisted cpt codes 2022WebFIELD OF THE INVENTION. The present invention relates to a process for producing a material suitable for the production of carbon fibers and molding carbon materials, and more particularly, to a process for continuous production of an optically anisotropic pitch for manufacturing carbon fibers and molding carbon materials having a high strength, high … rechner pc testWebMar 22, 2024 · An important necessity of optical manipulation in anisotropic fluids is to be able to visualize the ensuing changes in long-range molecular alignment as well as both the motion and transformation of defects. unlisted disclosing entityWebAug 1, 2007 · Because the block parts were too thick to be transmitted by light, the optical anisotropic phases could only be observed in the transparent parts between the blocks. It was found that the optical anisotropic phases increased firstly and then disappeared with the temperature. rechner paketWebForming optically anisotropic pitches Download PDF Info Publication number US4208267A. US4208267A US05/903,172 US90317278A US4208267A US 4208267 A … rechner performance testenWebTwo types of birefringence are suitable for producing the optical anisotropy necessary for use with an OTW: form birefringence and material birefringence. In form birefringence, a … rechner portable