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1、 257s0SVol. 25, No. 72009M7POLYMER MATERIALS SCIENCE AND ENGINEERING Jul. 2009bx/-=徐 玲, 杨 成, 段 彬, 蒋 超(2v,214122)K1:将非水相脂肪酶催化合成方法应用于淀粉改性领域,以猪胰脂肪酶为催化剂, 合成了淀粉/聚己内酯接枝共聚物b红外光谱和核磁共振谱证明产物中确实已接枝上聚己内酯, 通过核磁谱图分析计算有 97%以上的聚己内酯接枝在C2,C3 位的羟基上b详细研究了温度a初始水活度apH 值a底物摩尔比(己内酯/淀粉重复单元)对接枝率的影响, 发现 50ea初始水活度为0175apH值为71
2、5a底物摩尔比大于6时接枝效果较好b1oM:x;7;-=ms|: T Q 316. 343 DSM: A cI|: 1000- 7555( 2009) 07- 0034- 04l: 2008-06-13:SE1S( 20506008, 20776082)Y: ,1VY?s0, E-mail: cyang jiangnan. edu. cnx-Vs05,8V8dadad,_VB,x/-=,x/bNVT3D05,VTxB894 1 3bCa?4?=87ix,a6a4bbTB3bZE,.dbM1QHqa4zaBa60 4 ,nQOb4,-=8,3bEx/-=b1 Ls1.1 x:2; E-=8( C
3、L) : Fluka,B99%;O: Sigma-Aldrich;J?ada=J+( DM SO): A. R. ,S0vk4Kb1.2 LZE1.2.1 淀粉脱脂处理:Y4A,412 h,b2!b1.2.2 pH 记忆酶的制备5 :|ai0. 2 mol/ LpHA,!b1.2. 3 反应初始水活度的控制5 :i/|b9A,M48 h,PAM,!bLA25 eHTab. 1UbTab.1 Water activity values of selected salt hydratepairsat25 eS alt LiCl M gCl 2 NaBr NaCl KNO 3aw 0. 11 0.
4、33 0. 57 0. 75 0. 941.2.4 淀粉接枝聚己内酯的制备:|1. 1g(M$6179mmol)xbXY1 hg,F10 mL DM SO#BE-CL, 80 e16 h,iF0105 gbQ48 h,!50 e ,180 r/ minbQJ?,Y,d4A,448 h|40 eb2Q2b1.3 s1.3. 1 红外光谱( FT-IR)表征:F&vABBFT LA2000=M;N, KBrE,S500 cm - 1 4000 cm- 1b1. 3. 2 核磁共振( NMR ) 表征:BrukerAVANCE- 400HoN,DM SO-d64, TM S=S,60 ekb2 T)
5、2.1 FT-IRsFig. 1s,m( A)xm( B)M1,1725 cm- 1Cl,+,NVE-CL8xs0bD 6 ,x1638cm- 1Cb,O(1KabKa+,sBaa4a4#QHWyYbLQ8,Fig. 5VAOKa50e , 50 e 55 eS=zb2.3.2 体系水活度的影响:4Q,cY1oy,VPs0,9bbVFig . 6s,LQ80. 75HqKbVs,as0i=by7,:1v6,5Q9Fq4,sq4b3 O4dM8bx-=Q,YVFT- IRaNM Rs0,xX-36s0S2009M =,iO1C2, C3bQHq,?C50 eapH715aS0175Hq/brTz
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