![]() ![]() in case of valuable historic materials, is possible upon request. Sample amount required for approaches with pulp, fibers and micro-/nanostructured celluloses: 50- 100 mg of cellulose, preferably in the “natural” state, i.e., not specially dried or treated. Colony Place Shopping Centers & Malls Website (508) 746-7663 174 Colony Place Rd Plymouth, MA 02360 OPEN NOW 8. Independance Center Newco Shopping Centers & Malls (781) 585-0013 101 Independence Mall Way Kingston, MA 02364 7. size-exclusion chromatography (SEC) with multi-angle laser light scattering (MALLS). Shopping Centers & Malls (781) 585-5289 164 Summer St Kingston, MA 02364 6. For very low molar mass celluloses combined approaches or single calibration with cellulose model compounds can be performed to increase accuracy of the number average molar mass (Mn) (Oberlerchner et al. Molar mass distribution measurements are performed by SEC-MALLS-RI, i.e. Two MALLS systems with 488 nm and 660 nm lasers are available. ![]() 2017) that makes the substrate accessible for SEC analysis. Also many – although not all – nano- and microstructured celluloses (nanofibrillated, microfibrillated, nanocrystalline, microcrystalline celluloses) can be analyzed by this approach.ĭifferent alternative approaches (DMSO activation, derivatization, holocellulose isolation etc.) can be performed upon request or if the substrate requires to do so for proper analysis.įor cotton matrices, man-made fibers and all hemicellulose-free pulp variants we provide a specific DMSO activation protocol (Siller et al. In addition, there is ample experience in dissolution of different historic papers, bacterial celluloses, Asian papers, such as Washi and Hanji papers, cotton, or papyrus. Most pulps (kraft, sulfite pulp, organosolv), cotton, as well as cellulose II substrates (viscose fibers, lyocell fibers and others) are soluble in the DMAc/LiCl solvent system. In addition, the solvent system has become the standard solvent for SEC of celluloses as it has been proven to completely retain cellulose integrity. No derivatization step is necessary, which means that the molar mass remains unaltered by substituents. The samples are directly dissolved after activation and solvent exchange (Potthast et al. size-exclusion chromatography (SEC) with multi-angle laser light scattering (MALLS) / refractive index (RI) detection, in the solvent system N,N-dimethylacetamide (DMAc)/LiCl. Molar mass distribution measurements are performed by SEC-MALLS-RI, i.e. ![]()
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