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《N-羧丙酰壳聚糖钠增强改性壳聚糖棒材.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学:~(WuliHuaxueXuebao)Acta尸hys.一Chim.Sin.,2010,26(7):2053—20562053[Article】www.whxb.pku.edu.cnⅣ_羧丙酰壳聚糖钠增强改性壳聚糖棒材王征科胡巧玲(教育部高分子合成与功能构造重点实验窜,浙江大学高分子科学与工程学系牛物医用大分子研究所,杭州310027)摘要:采用原位沉析法制备Ⅳ_羧丙酰壳聚糖钠增强改性的三维壳聚糖复合棒材,并用傅里叶变换红#b(FFIR)光谱、x射线衍射(XRD)、热重(TG)分析、扫描电镜(SEM)I)A及力学性能测试等方法研究复
2、合棒材结构与性能之间的关系.FTIR分析表明,壳聚糖分子中的氨基官能团和乙酰氨基官能团均与~_羧丙酰壳聚糖钠分子中的羧酸盐官能团发牛强烈的静电相互作用.加入Ⅳ.羧丙酰壳聚糖钠后:两种分子问产生强烈的静电相互作用,限制了大分子链的运动,使得大分子链趋于刚性,同时复合棒材的层状香加结构变得更加紧密,提高了复合棒材的热稳定性tj力学性能;大分子链的刚性增强,限制_『分子链排入晶格,从而降低了壳聚糖的结晶度.当复合棒材中含有15%()的N-羧丙酰壳聚糖钠时,其弯曲强度和弯曲模量町达156.0MPa、5.3GPa,与纯壳聚糖棒材相比,分别提高了68.8%
3、、29.3%.因此,Ⅳ-羧酰壳聚糖钠可有效地增强改性维壳聚糖棒材,该三维复合物棒材有望用作骨折内同定材料.关键词:壳聚糖;N-羧丙酰壳聚糖钠;复合材料;增强改性;生物材料中图分类号:0648ChitosanRodsReinforcedbyN-CarboxylPropionylChitosanSodiumWANGZheng—KeHUQiao—Ling(KeyLaboratoryofMacromoleculeSynthesisandFunctionalization,MinistryofEducation,InstituteofBiomedical
4、MacromoleculesDepartmentofPolymerScienceandEngineering,ZhejiangUniversity,Hangzhou310027,P.R.China)Abstract:N—carboxylpropionylchitosansodium(CPCS)wasusedtoreinforcechitosan(cs)rodsbyann-situprecipitationmethod.Fouriertransforminfrared(FTIR)spectroscopy,X—raydiffraction(XRD)
5、,thermogravimetric(TG)analysis,scanningelectronmicroscopy(SEM),andmechanicaltestwereusedtostudythepropertiesofthecompositerods.TheFTIRspectraconfirmedthattheaminoandacetamidogroupsonCShadastrongelectrostaticatractiontothecarboxylategroupsonCPCS.TheXRDpaternsshowedthatthecrys
6、talsinCSweredestroyedbecauseoftheadditionofCPCS.Thetherma1stabilityoftheCPCS/CScompositerodswasbetterthanthoseofpureCSrodsandpureCPCSasastronginteractionexistsbetweenCSandCPCSmolecules.Thelayer_bv—layerstructureOftheCPCS/CScompositerodsbecametightercomparedwiththatofpureCSro
7、ds,whichresultedinimprovedmechanicalpropertiesforthecompositerods.As15%(w)C:PCSinthecompositerods,thebendingstrengthandthebendingmoduluswere156.0MPaand5.3GPa.whichincreasedbv68.8%and29.3%comparedwiththatofpureCSrods.respectively.Therefore,CPCSreinforcesCSrodseffectivelyandth
8、esecompositerodswithexcellentmechanicalpropertiescanbeusedinnove1biomedical
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