Preparation and properties of polydimethylsiloxane-modified chitosan
Preparation and properties of polydimethylsiloxane-modified chitosan
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DOI：
10.1016/j.carbpol.2005.08.063
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发表时间：
2006-02
影响因子：
11.2
通讯作者：
M. Rutnakornpituk;Paradorn Ngamdee;P. Phinyocheep
中科院分区：
文献类型：
--
作者：
M. Rutnakornpituk;Paradorn Ngamdee;P. Phinyocheep
本文讨论了聚二甲基硅氧烷（PDMS）改性壳聚糖的制备和性能。首先通过酸催化八甲基环四硅氧烷（D4）开环聚合制备了一系列分子量不同的PDMS预聚物。它们随后用烯丙基缩水甘油醚官能化以在PDMS末端获得环氧官能团。用1H NMR、13 C NMR和FTIR表征了它们的化学结构和分子量，用DSC测定了它们的热性能。环氧化PDMS和壳聚糖的反应在酸性水溶液中进行。增加PDMS的分子量和/或其浓度由于PDMS微相的形成而改善了柔性和水溶胀性。水接触角和水蒸气渗透率的测量表明，掺入的PDMS增强其疏水性相比，未改性的。
Preparation and properties of polydimethylsiloxane (PDMS)-modified chitosan are discussed herein. A series of PDMS with systematically varied molecular weights were first prepared via acid-catalyzed ring opening polymerization of octamethylcyclotetrasiloxane (D4) to obtain PDMS prepolymers. They were subsequently functionalized with allyl glycidyl ether to obtain epoxy functional groups at PDMS terminals. Their chemical structures and molecular weights were characterized using1H NMR,13C NMR and FTIR, and thermal properties were determined by DSC. The reaction of the epoxidized PDMS and chitosan was carried out in an acidic aqueous solution. Increasing the molecular weights of PDMS and/or its concentrations improved flexibility and water swellability due to the formation of PDMS microphase. Water contact angle and water vapor permeability measurements indicated that incorporation of the PDMS enhanced its hydrophobicity as compared to the unmodified one.