聚乙烯吡咯烷酮_壳聚糖共混水凝胶的制备与水的

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　第57卷　第11期　　2006年11月　　化　　　工　　　学　　　报　　　　　　　Vol157　No111

　Journal　of　Chemical　Industry　and　Engineering　(China)　　November　2006

研究论文

聚乙烯吡咯烷酮/壳聚糖共混水凝胶

的制备与水的状态

易国斌,杨少华,康　正,郭建维,崔亦华,谭帼馨,崔英德

(广东工业大学轻工化工学院,广州摘要:以戊二醛作为交联剂,)/),共混物的玻璃化转变

温度Tg随CHI,CHI∶PVP比而变化的微相分离1、、CHI脱乙酰度增大而升高1DSC分析表明,非冷冻状态下,CHI∶PVP时,、可冻结结合水、非冻结结合水含量分别为4217%、4313%、1410%;CHI∶PVP为1∶8,凝胶中含非冻结结合水少,DSC曲线上只有一个明显的失水吸热峰,由游离水与可冻结结合水叠加而成1-123℃冷冻条件下凝胶的DSC升温曲线在0、38、53℃观察到一组明显的焓化峰,这是由于低温时冻结为结晶相的游离水、可冻结结合水,随温度升高吸热又转化为游离水、可冻结结合水所致.关键词:聚乙烯吡咯烷酮;壳聚糖;水凝胶;水的状态中图分类号:TQ317　　　　　　文献标识码:A文章编号:0438-1157(2006)11-2761-05

Preparationandwateradsorptionofpolyvinylpyrrolidone/

chitosanblendhydrogel

YIGuobin,YANGShaohua,KANGZheng,GUOJianwei,CUIYihua,TANGuoxin,CUIYingde

(SchoolofLightIndustryandChemicalEngineering,GuangdongUniversity

ofTechnology,Guangzhou510006,Guangdong,China)

Abstract:Apolyvinylpyrrolidone(PVP)/chitosan(CHI)blendhydrogelwaspreparedwithammoniumceroussulfateasinitiatorandglutaraldehydeascrosslinkingagent1Itwasfoundthattheglass2transitiontemperature(Tg)oftheblendincreasedwithincreasingofPVPcontent1MicrozoneofCHIandPVPwereobservedoverthesurfaceofhydrogelfromSEMmicrographs1TheswellingratioofthehydrogelsincreasedwithincreasingofPVPcontent,decreasingPVPmolecularweightorincreasingdeacetylationdegreeofCHI1Atnormaltemperature,therewerethreeendothermicpeaksobservedfromDSCthermogramsofthehydrogelwithaCHI∶PVPratioof1∶2duetowaterloss,andthecontentoffreewater,freezingbondwaterandnon2freezingbondwaterare4217%,4313%and1410%respectively.However,therewasonlyonepeakwhentheCHI∶PVPratiowas1∶81Agroupofpeakswereobservedat0℃,38℃and53℃fromDSCthermogramsofthehydrogelisthefreezingstateof-123℃1Itwasresultedfromthetransitionfromcrystallinewater(formedfromfreewaterandfreezingbondwateratalowtemperature)andbacktofreewaterandfreezingbondwateratahighertemperature.

Keywords:polyvinylpyrrolidone;chitosan;hydrogel;statesofwater

　　2005-09-19收到初稿,2006-05-20收到修改稿.

),男,博士,副教授.联系人及第一作者:易国斌(1969—

　　Receiveddate:2005-09-19.

Corresponding

author:

YI

Guobin,associate

professor.

E-mail:ygb116@1631com

Foundationitem:supportedbyGuangzhouItemofScienceandTechnologySchemeandFoundationItemofEducationalDepartmentofGuangdongProvince.

基金项目:广州市科技计划项目(20012Z2103201);广东省教育厅自然科学基金项目(Z02030).