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35px="" 0px="" 15px="" background:="" position:="" color:="" white-space:=""><h2 class="title-text" style="margin: 0px; padding: 0px 8px 0px 18px; font-size: 22px; color: rgb(0, 0, 0); float: left; line-height: 24px; font-weight: 400; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">概念</h2><a class="edit-icon j-edit-link" data-edit-dl="1" style="color: rgb(136, 136, 136); display: block; float: right; height: 24px; line-height: 24px; padding-left: 24px; font-size: 12px; font-family: SimSun; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span id="vk9raghf" class="cmn-icon wiki-lemma-icons wiki-lemma-icons_edit-lemma" style="font-family: baikeFont_layout; -webkit-font-smoothing: antialiased; speak: none; font-variant-numeric: normal; font-variant-east-asian: normal; line-height: 1; outline: 0px; margin: 0px 3px 0px 0px; vertical-align: -2px; color: rgb(170, 170, 170); font-size: 14px;"></span>編輯</a><a class="audio-play part-audio-play J-part-audio-play" style="color: rgb(136, 136, 136); display: block; float: right; height: 24px; line-height: 24px; padding-left: 24px; font-size: 12px; font-family: SimSun; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; outline: 0px;"><span id="vk9raghf" class="cmn-icon wiki-lemma-icons wiki-lemma-icons_voice-play" style="font-family: baikeFont_layout; -webkit-font-smoothing: antialiased; speak: none; font-variant-numeric: normal; font-variant-east-asian: normal; line-height: 1; outline: 0px; font-size: 16px; margin: 0px 3px 0px 0px; vertical-align: text-bottom; color: rgb(170, 170, 170);"></span> <span id="vk9raghf" class="J-part-audio-text">播報</span></a></div><p style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><br/></p><p style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">表觀粘度，是指在一定速度梯度下，用相應(yīng)的剪切應(yīng)力除以剪切速率所得的商。表觀粘度有可能大于真實粘度也有可能小于真實粘度。</p><div id="vk9raghf" class="para" label-module="para" data-pid="6" style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">它只是對流動性好壞作一個相對的大致比較。真正的粘度應(yīng)當(dāng)是不可逆的粘性流動的一部分，而表觀粘度還包括了可逆的高彈性變形那一部分，所以表觀粘度一般小于真正粘度。表觀粘度又可以分為剪切粘度和拉伸粘度。</div><div id="vk9raghf" class="anchor-list " style="position: relative; color: rgb(51, 51, 51); font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" font-size:="" white-space:="" background-color:=""><a style="color: rgb(19, 110, 194); position: absolute; top: -50px;" name="2"></a><a style="color: rgb(19, 110, 194); position: absolute; top: -50px;" name="sub531416_2"></a><br/></div><div id="vk9raghf" class="para-title level-2 J-chapter" data-index="2" label-module="para-title" data-pid="7" style="clear: both; border-left: 12px solid rgb(79, 156, 238); line-height: 24px; font-size: 22px; font-family: " microsoft="" margin:="" 35px="" 0px="" 15px="" background:="" position:="" color:="" white-space:=""><h2 class="title-text" style="margin: 0px; padding: 0px 8px 0px 18px; font-size: 22px; color: rgb(0, 0, 0); float: left; line-height: 24px; font-weight: 400; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">基本原理</h2><a class="edit-icon j-edit-link" data-edit-dl="2" style="color: rgb(136, 136, 136); display: block; float: right; height: 24px; line-height: 24px; padding-left: 24px; font-size: 12px; font-family: SimSun; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span id="vk9raghf" class="cmn-icon wiki-lemma-icons wiki-lemma-icons_edit-lemma" style="font-family: baikeFont_layout; -webkit-font-smoothing: antialiased; speak: none; font-variant-numeric: normal; font-variant-east-asian: normal; line-height: 1; outline: 0px; margin: 0px 3px 0px 0px; vertical-align: -2px; color: rgb(170, 170, 170); font-size: 14px;"></span>編輯</a><a class="audio-play part-audio-play J-part-audio-play" style="color: rgb(136, 136, 136); display: block; float: right; height: 24px; line-height: 24px; padding-left: 24px; font-size: 12px; font-family: SimSun; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; outline: 0px;"><span id="vk9raghf" class="cmn-icon wiki-lemma-icons wiki-lemma-icons_voice-play" style="font-family: baikeFont_layout; -webkit-font-smoothing: antialiased; speak: none; font-variant-numeric: normal; font-variant-east-asian: normal; line-height: 1; outline: 0px; font-size: 16px; margin: 0px 3px 0px 0px; vertical-align: text-bottom; color: rgb(170, 170, 170);"></span> <span id="vk9raghf" class="J-part-audio-text">播報</span></a></div><p style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><br/></p><p style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">由于非牛頓流體的粘度隨γ′和σ而變化，所以人們用流動曲線上某一點的σ與γ′的比值，來表示在某一值時的粘度，這種粘度稱為表觀粘度，用ηa表示。</p><div id="vk9raghf" class="para" label-module="para" data-pid="9" style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">當(dāng)γ′很小時，粘度較大，而且是一個定值，我們稱這個粘度為零切粘度，用ηo表示，常作為聚合物粘度的標(biāo)準。</div><p style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">當(dāng)γ′很高時，粘度較小，而且趨向于極限值，該值稱為無限大切應(yīng)力下的粘度，用η∞表示。<span id="vk9raghf" class="sup--normal" data-sup="1" data-ctrmap=":1," style="font-size: 12px; line-height: 0; position: relative; vertical-align: baseline; top: -0.5em; margin-left: 2px; color: rgb(51, 102, 204); cursor: pointer; padding: 0px 2px;"> [1]</span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img61.chem17.com/2/20220904/637979012561586005762.jpg" alt="637979012561586005762.jpg"/></p><p style="overflow-wrap: break-word; color: rgb(51, 51, 51); margin-bottom: 15px; text-indent: 2em; line-height: 24px; zoom: 1; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><a data-log="text" style="color: rgb(19, 110, 194); position: relative; top: -100px; font-size: 0px; 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