2023木质纤维素类生物质原料聚合度的测定

木质纤维素类生物质原料聚合度的测定PAGEPAGE4木质纤维素类生物质原料聚合度的测定范围规范性引用文件NB/T34029—2015非粮生物质原料名词术语GB/T1548-2016纸浆铜乙二胺（CED）溶液中特性粘度值的测定NB/T34057.1-20171制备NB/T34057.2-20171纯化术语和定义下列术语和定义适用于本文件。3.1木质纤维素lignocellulose混有木质素、纤维素和半纤维素的天然植物纤维。[NB/T34029—2015，定义4.11]3.2纤维素cellulose由D-葡萄糖通过β-1,4-葡萄糖苷键连接形成的具有晶体结构的线性直链高分子多糖，氧元素含量较高，聚合度高。[NB/T34029—2015，定义4.11.1]3.3聚合度degreeofpolymerization木质纤维素类生物质原料中纤维素分子量平均长度的反应。原理在250.7-0.8mm。仪器设备分析天平：精密度达±0.0001g；5.2乌氏粘度计：0.7-0.8mm；5.3玻璃恒温水浴槽：可维持(25.0±0.1)℃的条件；5.4烘箱：可维持(105±3)℃的条件；3000g转速；15mL聚四氟乙烯离心管；干燥器及干燥剂。试验试剂GB/T66821mol/LGB/T1548-2016试验步骤样品的制备和纯化NB/T34057.1-2017，木质纤维素类生物NB/T34057.2-20174h至恒重(1h1%)。样品的溶解0.050g0.001g,1mol/L0.5mol/L15mL10mL0.5mol/L2h15mL10mL上述铜乙二胺溶剂，并同时置于玻璃恒温水浴槽中作为对照。15mL3000gmin15mL心管同时置于玻璃恒温水浴槽中，在(25.0±0.1)℃的条件下平衡温度30min，待测。(105±3)4h至恒重后(1h内的样品质量变化不1%)0.001g,。聚合度的测定向乌氏粘度计添加样品溶液至刻度线，置于玻璃恒温水浴槽中保温5min。记录样品溶。试验数据处理按式(1)计算相对粘度：式中：l

�𝑟�=�………(1)�0�T ——样品溶液流经乌氏粘度计上下两个刻度的平均时间，单位为秒(s)；0 (s按式(2)计算样品溶液浓度：�=�0−�………(2)�C（g/m；0(gW——未溶解标准样品的质量，单位为克(g)。V——铜乙二胺溶剂体积，单位为毫升(mL)，此处为10mL。样品溶液特性粘度A.1按式(3)计算聚合度：

𝐷0.905=0.75•[�]………(3)DP——木质纤维素类生物质原料样品聚合度；[η]——样品溶液特性粘度。精密度取两个平行测定结果的算术平均值为测定结果。10%。PAGEPAGE5附录A（规范性附录）l0.000.010.020.030.040.050.060.070.080.09l0.000.010.020.030.040.050.060.070.080.091.00.0000.0100.0200.0300.0400.0490.0590.0690.0780.0881.10.0970.1070.1160.1250.1340.1440.1530.1620.1710.1801.20.1890.1980.2070.2160.2240.2330.2420.2500.2590.2681.30.2760.2850.2930.3020.3100.3180.3260.3350.3430.3511.40.3590.3670.3750.3830.3910.3990.4070.4150.4230.4311.50.4380.4460.4540.4620.4690.4770.4840.4920.4990.5071.60.5140.5220.5290.5370.5440.5510.5580.5660.5730.5801.70.5870.5940.6010.6080.6150.6220.6290.6360.6430.6501.80.6570.6640.6710.6780.6840.6910.6980.7050.7110.7181.90.7250.7310.7380.7440.7510.7570.7640.7700.7770.7832.00.7900.7960.8020.8090.8150.8210.8270.8430.8400.8462.10.8520.8580.8650.8710.8770.8830.8890.8950.9010.9072.20.9130.9190.9250.9310.9370.9430.9490.9540.9600.9662.30.9720.9780.9830.9890.9951.0011.0061.0121.0181.0232.41.0291.0351.0401.0461.0511.0571.0621.0681.0731.0792.51.0841.0901.0951.1011.1061.1111.1171.1221.1271.1332.61.1381.1431.1491.1541.1591.1641.1701.1751.1801.1852.71.1901.1961.2011.2061.2111.2161.2211.2261.2311.2362.81.2411.2461.2511.2561.2611.2661.2711.2761.2811.2862.91.2911.2961.3011.3061.3101.3161.3201.3251.3301.3353.01.3391.3441.3491.3541.3581.3631.3681.3731.3771.3823.11.3871.3911.3961.4011.4051.4101.4141.4191.4241.4283.21.4331.4371.4421.4461.4511.4551.4601.4641.4691.4733.31.4781.4821.4871.4911.4961.5001.5041.5091.5131.5173.41.5221.5261.5311.5351.5391.5441.5481.5221.5561.5613.51.5651.5691.5731.5781.5821.5861.5901.5951.5991.6033.61.6071.6111.6151.6201.6241.6281.6321.6381.6401.6443.71.6481.6531.6571.6611.6651.6691.6731.6771.6811.6853.81.6891.6931.6971.7011.7051.7091.7131.7171.7211.7253.91.7291.7321.7361.7401.7441.7481.7521.7561.7601.7644.01.7671.7711.7751.7791.7831.7871.7901.7941.7981.8024.11.8061.8091.8131.8171.8211.8241.8281.8231.8361.8394.21.8431.8471.8511.8541.8581.8621.8651.8691.8731.8764.31.8801.8841.8871.8911.8941.8981.9021.9051.9091.9124.41.9161.9201.9231.9271.9301.9341.9371.9411.9441.9484.51.9521.9551.9591.9621.9661.9691.9731.9761.9791.9834.61.9861.9901.9931.9972.0002.0042.0072.0102.0142.017表A.1（续）l0.000.010.020.030.040.050.060.070.080.094.72.0212.0242.0282.0312.0342.0382.0412.0442.0482.0514.82.0542.0582.0612.0642.0682.0712.0742.0782.0812.0844.92.0882.0912.0942.0982.1012.1042.1072.1112.1142.1175.02.1202.1242.1272.1302.1332.1372.1402.1432.1462.1495.12.1532.1562.1592.1622.1652.1682.1722.1752.1782.1815.22.1842.1872.1912.1942.1972.2002.2032.2062.2092.2125.32.2152.2192.2222.2252.2282.2312.2342.2372.2402.2435.42.2462.2492.2522.2552.2582.2612.2642.2672.2702.2735.52.2762.2802.2832.2862.2882.2912.2942.2972.3002.3035.62.3062.3092.3212.3152.3182.3212.3242.3272.3302.3335.72.3362.3392.3422.3452.3472.3502.3532.3562.3592.3625.82.3652.3682.3712.3742.3762.3792.3822.3852.3882.3915.92.3942.3962.3992.4022.4052.4082.4112.4132.4162.4196.02.4222.4252.4272.4302.4332.4362.4392.4412.4442.4476.12.4502.4522.4552.4582.4612.4632.4662.4692.4722.4756.22.4772.4802.4832.4852.4882.4912.4942.4962.4992.5026.32.5042.5072.5102.5122.5152.5182.5212.5232.5262.5296.42.5312.5342.5372.5392.5422.5452.5472.5502.5522.5556.52.5582.5602.5632.5662.5682.5712.5732.5762.5792.5816.62.5842.5872.5892.5922.5942.5972.5992.6022.6052.6076.72.6102.6122.6152.6172.6202.6232.6252.6282.6302.6336.82.6352.6382.6402.6432.6452.6482.6512.6532.6562.6596.92.6612.6632.6662.6682.6712.6732.6762.6782.6812.6837.02.6862.6882.6902.6932.6952.6982.7002.7032.7052.7087.12.7102.7132.7152.7182.7202.7222.7252.7272.7302.7327.22.7352.7372.7392.7422.7442.7472.7492.7522.7542.7567.32.7582.7612.7642.7662.7682.7712.7732.7752.7782.7807.42.7832.7852.7872.7902.7922.7942.7972.7992.8012.8047.52.8062.8092.8112.8132.8162.8182.8202.8232.8252.8277.62.8292.8322.8342.8362.8392.8412.8432.8462.8482.8507.72.8532.8552.8572.8592.8622.8642.8662.8692.8712.8737.82.8752.8782.8802.8822.8852.8872.8892.8912.8942.8967.92.8982.9002.9032.9052.9072.9092.9112.9142.9162.9188.02.9202.9232.9252.9272.9292.9322.9342.9362.9382.9408.12.9432.9452.9472.9492.9512.9542.9562.9582.9602.9628.22.9642.9672.9692.9712.9732.9752.9782.9802.9822.9848.32.9862.9882.9912.9932.9952.9972.9993.0013.0033.0068.43.0083.0103.0123.0143.0163.0183.0203.0233.0253.0278.53.0293.0313.0333.0353.0373.0403.0423.0443.0463.0488.63.0503.0523.0543.0563.0583.0613.0633.0653.0673.0698.73.0713.0733.0753.0773.0793.0813.0833.0853.0873.090表A.1（续）l0.000.010.020.030.040.050.060.070.080.098.83.0923.0943.0963.0983.1003.1023.1043.1063.1083.1108.93.1123.1143.1163.1183.1203.1223.1243.1263.1283.1309.03.1323.1343.1363.1383.1403.1423.1443.1473.1493.1519.13.1533.1553.1573.1593.1613.1633.1653.1663.1683.1709.23.1723.1743.1763.1783.1803.1823.1843.1863.1883.1909.33.1923.1943.1963.1983.2003.2023.2043.2063.2083.2109.43.2123.2143.2163.2183.2203.2223.2233.2253.2273.2299.53.2313.2333.2353.2373.2393.2413.2433.2453.2473.2499.63.2503.2523.2543.2563.2583.2603.2623.2643.2663.2689.73.2703.2713.2733.2753.2