GB/T8658—XXXX1乳液聚合型苯乙烯-丁二烯橡膠生膠結合苯乙烯含量的測定折光指數法GB/T15340天然、合成生膠取樣及其制樣方法（GB/T155.1乙醇-甲苯共沸液（ETA）：將7體積的無水乙醇與3體積的甲苯混合。也可以使用7體積GB/T8658—XXXX26.3阿貝(Abbe)折光儀：量值精確至小數第四位。為了測定固體的折光指數，可調其折射棱鏡接近水平位置。為了消除色差，必須有一個阿米西(Amici)）：可使用鈉燈作光源。對光源的要求是能夠在折光儀的目-甲苯共沸液（5.1但對礬凝聚的橡膠，須少粘連。將回流冷凝器（6.2）裝在廣口錐形瓶上，在回流條件下，緩慢煮沸1h后，棄去抽提液。重新加入100mL萃取劑，再緩慢煮沸1h，棄去注1：可以使用索氏抽提的方式代替回流抽提，但抽提時間至少要7.2待試樣充分干燥后，將其壓制成薄片。壓片時可以根據橡膠的類型和現有的設備在多種適用的方2GB/T8658—XXXX310.35MPa之間。有些聚合物所要求的壓力較低，也有些聚合物可能需要在7.3最終測量用試片的厚度不得超過O.5mm，還7.4用剪刀(6.9)將所制備的試樣剪為兩半并剝下一面的鋁箔，用剪刀剪下一片寬約6mm、長約12mm8.3將試樣置于棱鏡上原放置標準玻璃塊的位置，讓試樣的剪切面朝向光源。將薄皺紙從光路移開，壓棱鏡上的試樣，檢查試樣和棱鏡的接觸情況，在進行此項檢查時，分界線的位置不得產生變8.5對具有新剪切面的另一半試樣重復進行上述的測定，將得到的兩組讀數分別進行平均。如果兩組nas=ng+0.000378-25)................................(1)nθ——測定溫度下折光指數的數值；θ——測定溫度的數值，單位為攝氏度(℃)。9結果計算w;=23.50+1164(nss-1.53456)-3497(nss-1.53456)?..................(2)GB/T8658—XXXX4表125℃下苯乙烯-丁二烯橡膠的折光指數與結合苯乙烯含量（質量分折光指數01234567891.5150.040.170.300.430.561.5160.690.820.951.5172.112.242.372.502.622.752.883.013.141.5183.273.393.523.653.783.904.034.164.294.411.5194.544.674.804.925.055.185.305.435.565.681.5205.815.946.066.196.326.446.576.706.826.951.5217.077.207.327.457.587.707.837.958.088.201.5228.338.458.588.708.838.959.089.209.339.451.5239.589.709.839.9510.0710.2010.3210.4510.5710.691.52410.8210.9411.0711.1911.3111.4411.5611.6811.8111.931.52512.0512.1812.3012.4212.5412.6712.7912.9113.0413.161.52613.2813.4013.5213.6513.7713.8914.0114.1314.2614.381.52714.5014.6214.7414.8714.9915.1115.2315.3515.4715.591.52815.7115.8315.9616.0816.2016.3216.4416.5616.6816.801.52916.9217.0417.1617.2817.4017.5217.6417.7617.8818.001.53018.1218.2418.3618.4818.6018.7218.8418.9519.0719.191.53119.3119.4319.5519.6719.7919.9120.0220.1420.2620.381.53220.5020.6220.7320.8520.9721.0921.2121.3221.4421.561.53321.6821.7921.9122.0322.1522.2622.3822.5022.6122.731.53422.8522.9623.0823.2023.3123.4323.5523.6623.7823.901.53524.0124.1324.2424.3624.4824.5924.7124.8224.9425.051.53625.1725.2825.4025.5125.6325.7425.8625.9726.0926.201.53726.3226.4326.5526.6626.7826.8927.0127.1227.2327.351.53827.4627.5827.6927.8027.9228.0328.1528.2628.3728.491.53928.6028.7128.8328.9429.0529.1629.2829.3929.5029.621.54029.7329.8429.9530.0730.1830.2930.4030.5230.6330.741.54130.8530.9631.0731.1931.3031.4131.5231.6331.7431.861.54231.9732.0832.1932.3032.4132.5232.6332.7432.8532.961.54333.0833.1933.3033.4133.5233.6333.7433.8533.9634.071.54434.1834.2934.4034.5134.6234.7234.8334.9435.0535.161.54535.2735.3835.4935.6035.7135.8235.9236.0336.1436.251.54636.3636.4736.5836.6836.7936.9037.0137.1237.2237.331.54737.4437.5537.6537.7637.8737.9838.0838.1938.3038.411.54838.5138.6238.7338.8338.9439.0539.1539.2639.3739.471.54939.5839.6939.7939.9040.0040.1140.2240.3240.4340.531.55040.6440.7440.8540.9541.0641.1741.2741.3841.4841.591.55141.6941.8041.9042.0142.1142.2142.3242.4242.5342.631.55242.7442.8442.9443.0543.1543.2643.3643.4643.5743.671.55343.7843.8843.9844.0944.1944.2944.3944.5044.6044.70GB/T8658—XXXX51.55444.8144.9145.0145.1145.2245.3245.4245.5245.6345.731.55545.8345.9346.0446.1446.2446.3446.4446.5446.6546.751.55646.8546.9547.0547.1547.2547.3547.4647.5647.6647.761.55747.8647.9648.0648.1648.2648.3648.4648.5648.6648.761.55848.8648.9649.0649.1649.2649.3649.4649.5649.6649.761.55949.8649.9650.0650.1650.2650.3650.4550.5550.6550.751.56050.8550.9551.0551.1451.2451.3451.4451.5451.6451.731.56151.8351.9352.0352.1252.2252.3252.4252.5252.6152.711.56252.8152.9053.0053.1053.2053.2953.3953.4953.5853.681.56353.7853.8753.9754.0654.1654.2654.3554.4554.5554.641.56454.7454.8354.9355.0255.1255.2255.3155.4155.5055.60GB/T8658—XXXX61991年，ISO/TC45/SC3確2019年，按照ISO19983的規定確定了方法的精密度,精密度類型為1型。來自中國和日本的六家實參與精密度試驗。采用的樣品是5℃聚合的乳聚丁苯橡膠，包括非充油橡膠SBR1502和充油橡膠SBRA.2.2再現性：50℃聚合的SBR的再現性與重復性處于同一數量級。對于5℃聚合的SBR的再現性尚