Magnetic Resonance in Studying Natural and Synthetic Materials

Magnetic Resonance Imaging in Characterisation of Polymer Films

Author(s): Victor V. Rodin

Pp: 150-162 (13)

DOI: 10.2174/9781681086293118010015

* (Excluding Mailing and Handling)

Abstract

Diffusivity and distribution of water in random copolymer films of butyl methacrylate and methacrylic acid swollen in water have been investigated using magnetic resonance imaging (MRI) and NMR relaxation techniques. The relative contributions of the protons of the polymer matrix and bound water have been analyzed using 1H NMR spectra and MRI data of the swollen films. Pulse Field Gradient (PFG) NMR experiments have been carried out in parallel to the MRI studies. The results have been discussed with reference to published MRI data for water in a number of polymer materials. The free induction decay (FID) and the spin-spin relaxation times (T2) data for water saturated polymer films correlated well with the MRI intensities for the same samples. The results show that by varying the hydrophobic/hydrophilic comonomer ratios in the polymers, the water ingress can be changed. MRI data show how to monitor drying process. Moisture profiles and relaxation data were obtained during film drying. The time dependences of the image slices intensity for the drying films were fitted by a single-exponential function with an average time constant as k = −0.02 min−1.


Keywords: Copolymer swollen films, Evaporation, Free induction decay (FID), Fourier transform (FT), Hydrophobic/hydrophilic ratio, Magnetic resonance imaging (MRI), NMR spectra, Pulsed Field Gradient (PFG) NMR, Spin-spin relaxation time T2, Stimulated echo (STE), Water.

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      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Trial Access" as access_base_text, CASE j.type WHEN 111 THEN true ELSE false END as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_trail` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 59694094 and j.to_ip >=59694094 )) and ((j.from_date <= 1739835115 and j.to_date >= 1739835115 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 12644) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Subscribed" as access_base_text, false as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_corporate` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 59694094 and j.to_ip >=59694094 )) and ((j.from_date <= 1739835115 and j.to_date >= 1739835115 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 12644) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Token Based Access" as access_base_text, false as terms_popup, "R" as content_download_type, j.uc_id as restricted_user_access_key, "v" as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_token` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 59694094 and j.to_ip >=59694094 )) and ((j.from_date <= 1739835115 and j.to_date >= 1739835115 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 12644)
      520μsalphaeurekaselec_live_10_06_2022UserAccess.php#1266
      Backtrace
      • 13. app/Models/UserAccess/UserAccess.php:1266
      • 14. app/Http/Controllers/ChapterController.php:1549
      • 15. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • select b.banner_link, b.banner_name, b.banner_script, b.banner_remarks, b.banner_file_name, b.banner_placement, bd.content_type, bd.content_id from `tbl_banner` as `b` inner join `tbl_banner_detail` as `bd` on `bd`.`banner_id` = `b`.`banner_id` inner join `users` as `u` on `u`.`id` = `b`.`updated_by` where `b`.`banner_ebook` = 1 and `bd`.`content_type` = 'B' and `bd`.`content_id` = 2517 and `b`.`banner_from_date` <= 1739835115 and `b`.`banner_to_date` >= 1739835115 and `b`.`banner_status` = 'A' order by `b`.`banner_id` desc
      1.03msalphaeurekaselec_live_10_06_2022Banner.php#95
      Bindings
      • 0: 1
      • 1: B
      • 2: 2517
      • 3: 1739835115
      • 4: 1739835115
      • 5: A
      Backtrace
      • 13. app/Models/Banner.php:95
      • 14. app/Http/helpers.php:404
      • 17. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 18. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    • select count(*) as aggregate from `uc_cart_products` where cart_id='0d7bebdcfa6f5e7babaef0a42108c075'
      220μsalphaeurekaselec_live_10_06_2022Cart.php#271
      Backtrace
      • 15. app/Models/Cart.php:271
      • 16. view::layouts._header:260
      • 18. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 20. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    App\Models\Keywords
    11Keywords.php#?
    App\Models\Chapter
    1Chapter.php#?
    App\Models\Ebook
    1Ebook.php#?
        _token
        iVc26PEOj8fN7dp0vZV46kFMr5y7dJeACOVNyGGH
        uc_cart_id
        0d7bebdcfa6f5e7babaef0a42108c075
        _previous
        array:1 [ "url" => "https://alpha.eurekaselect.com/chapter/12644" ]
        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /chapter/12644
        status_code
        200
        
        status_text
        OK
        format
        html
        content_type
        text/html; charset=UTF-8
        request_query
        []
        
        request_request
        []
        
        request_headers
        0 of 0
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        request_cookies
        0 of 0
        array:6 [ "_ga" => null "_ga_9F3B5VV3T3" => null "fpestid" => null "wayfindertarget" => null "XSRF-TOKEN" => "iVc26PEOj8fN7dp0vZV46kFMr5y7dJeACOVNyGGH" "alphaeurekaselectnet_session" => "Lickq1WASCCji3orradGxXMOJbyuTQ0wc5sNMq7u" ]
        response_headers
        0 of 0
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        session_attributes
        0 of 0
        array:5 [ "_token" => "iVc26PEOj8fN7dp0vZV46kFMr5y7dJeACOVNyGGH" "uc_cart_id" => "0d7bebdcfa6f5e7babaef0a42108c075" "_previous" => array:1 [ "url" => "https://alpha.eurekaselect.com/chapter/12644" ] "_flash" => array:2 [ "old" => [] "new" => [] ] "PHPDEBUGBAR_STACK_DATA" => [] ]
        ClearShow all
        Date ↕MethodURLData
        #12025-02-17 23:31:55GET/chapter/126441121913