16 resultados para Pattison, Mark, 1813-1884:
Filtro por publicador
- Aberystwyth University Repository - Reino Unido (1)
- Academic Research Repository at Institute of Developing Economies (2)
- Acceda, el repositorio institucional de la Universidad de Las Palmas de Gran Canaria. España (2)
- AMS Tesi di Dottorato - Alm@DL - Università di Bologna (1)
- Aquatic Commons (10)
- Biblioteca Digital da Câmara dos Deputados (4)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (2)
- Biblioteca Digital de la Universidad Católica Argentina (1)
- Biblioteca Digital de Teses e Dissertações Eletrônicas da UERJ (1)
- Biblioteca Digital Loyola - Universidad de Deusto (1)
- Biblioteca Valenciana Digital - Ministerio de Educación, Cultura y Deporte - Valencia - Espanha (165)
- Bibloteca do Senado Federal do Brasil (1)
- Biodiversity Heritage Library, United States (1)
- BORIS: Bern Open Repository and Information System - Berna - Suiça (22)
- Boston College Law School, Boston College (BC), United States (1)
- Boston University Digital Common (7)
- Brock University, Canada (163)
- Cambridge University Engineering Department Publications Database (3)
- CentAUR: Central Archive University of Reading - UK (21)
- Center for Jewish History Digital Collections (3)
- Chinese Academy of Sciences Institutional Repositories Grid Portal (16)
- Collection Of Biostatistics Research Archive (1)
- Comissão Econômica para a América Latina e o Caribe (CEPAL) (4)
- CORA - Cork Open Research Archive - University College Cork - Ireland (2)
- Dalarna University College Electronic Archive (1)
- Deakin Research Online - Australia (36)
- DI-fusion - The institutional repository of Université Libre de Bruxelles (1)
- Digital Archives@Colby (4)
- Digital Commons - Michigan Tech (1)
- DigitalCommons - The University of Maine Research (1)
- DigitalCommons@The Texas Medical Center (1)
- DigitalCommons@University of Nebraska - Lincoln (3)
- Digitale Sammlungen - Goethe-Universität Frankfurt am Main (89)
- eResearch Archive - Queensland Department of Agriculture; Fisheries and Forestry (3)
- Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (104)
- Helda - Digital Repository of University of Helsinki (2)
- Indian Institute of Science - Bangalore - Índia (2)
- Lume - Repositório Digital da Universidade Federal do Rio Grande do Sul (1)
- Memoria Académica - FaHCE, UNLP - Argentina (44)
- Ministerio de Cultura, Spain (9)
- Plymouth Marine Science Electronic Archive (PlyMSEA) (3)
- Publishing Network for Geoscientific & Environmental Data (46)
- QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (64)
- Queensland University of Technology - ePrints Archive (18)
- Repositório digital da Fundação Getúlio Vargas - FGV (3)
- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (18)
- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (1)
- SAPIENTIA - Universidade do Algarve - Portugal (1)
- School of Medicine, Washington University, United States (7)
- South Carolina State Documents Depository (1)
- Universidad Autónoma de Nuevo León, Mexico (20)
- Universidad del Rosario, Colombia (1)
- Universidad Politécnica de Madrid (2)
- Universidade Federal do Pará (4)
- Universitat de Girona, Spain (2)
- Universitätsbibliothek Kassel, Universität Kassel, Germany (3)
- Université de Montréal, Canada (6)
- University of Michigan (43)
- University of Southampton, United Kingdom (6)
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Resumo:
通过多步脱乙酰基反应和溶液超声波降解制备了脱乙酰度D.D在49—100%(wt),重均分子量在1.94—25.1×10~5的系列壳聚糖样品,在0.1mol/L CH_3COONa+0.2mol/L CH_3COOH溶剂中和30℃下,用光散射法首次订定出了不同D.D壳聚糖的M-H方程常数K和α值,结果如下:D.D(wt%) K×10~3(ml·g~(-)1) α69 0.104 1.1284 1.424 0.9691 6.589 0.88100 16.800 0.81导致K和α值差别的主要原因是由于壳聚糖大分子链上的胺基(—NH_2)被酸质子化后,失去了形成分子内氢键的能力,减弱了内旋转受阻程度,同时,质子化后形成的阳离子聚电解质分子链链段间以及链段与溶剂之间的相互作用增强,有效电荷密度的增加使得聚电解质溶液粘度增大。