高分子模口膨脹是成型加工中常見的現象，而造成模口膨脹的因素可分為兩大類：一類屬於原材料規格、種類、性能以及吐出量對模口膨脹的影響；另一類屬於加工參數對模口膨脹的影響。
　　本研究主要針對具有吸濕性以及光觸媒效能的聚丙烯纖維，經由熔融紡絲法紡嘴擠出後產生的模口膨脹行為進行探討，當剪切速率、紡絲溫度、剪切黏度、毛細管長度、�炰V比例改變，以及二氧化鈦的添加對於�炰V體膨潤比變化的影響性。
　　由研究結果可得知：聚丙烯/擬熱可塑型聚乙烯醇/二氧化鈦(PP/PTPVA/TiO2) �炰V體的膨潤比會隨著剪切速率的上升而增加，主要是在毛細管前流線收斂、速度梯度增加的影響。紡絲溫度的上升造成分子鏈的解纏結作用，膨潤比因而下降，但對於擬熱可塑型聚乙烯醇的影響性並不明顯。剪切黏度的上升使�炰V體的流動阻力增加，膨潤比隨之減少。毛細管長度與熔體鬆弛時間成正比，當管長增加，�炰V體之膨潤比下降。聚丙烯、擬熱可塑型聚乙烯醇�洃顐珣答�1：1時，因為分子鏈間作用力的影響，膨潤比會呈現最大值。添加1%二氧化鈦之後，�炰V體膨潤比因二氧化鈦的潤滑作用而下降。

Die swelling is a regular phenomenon in polymer forming process. The reasons for this phenomenon are two： One is the influence of the specification, variety, capability, and the dosage of raw materials, the other is the effect of the manufacturing parameters.
In this study, we focused on the die swelling phenomenon of polypropylene fibers with hygroscopicity and photo-catalyst ability when extracted from spinneret by melt spinning. The influence on swell ratios of different shear rate, spinning temperature, shear viscosity, length of capillary, blending ratios, and the adding of titanium dioxide were discussed.
From the experiments, the swell ratios of polypropylene/ pseudo-thermoplastic polyvinyl alcohol/ titanium dioxide blend　(PP/PTPVA/TiO2) would increase with the increase of shear rate. It’s because the molecular chains converged before entering into the capillary tube, and the velocity gradient raised. The increase of spinning temperature would lead to the disentanglement of the molecular chains, and the decrease of the swell ratios. For PTPVA, the effect of spinning temperature was not obvious. When shear viscosity increased, the flow resistance of PP/PTPVA/TiO2 blends would increase, and the swell ratios decreased. There is a direct proportion between the length of capillary tube and the relaxation. When the tube length increased, the swell ratios of blends would decrease.

摘要-----------------------------------------------------------------------------------------------------------------------Ⅰ
Abstract--------------------------------------------------------------------------------------------------------------------Ⅱ
目錄------------------------------------------------------------------------------------------------------------------------Ⅲ
圖目錄---------------------------------------------------------------------------------------------------------------------Ⅴ
表目錄---------------------------------------------------------------------------------------------------------------------Ⅵ
第一章 緒論-------------------------------------------------------------------------------------------------------------1
1-1 前言-------------------------------------------------------------------------------------------------------------------1
1-2 模口膨脹現象------------------------------------------------------------------------------------------------------3
1-2-1 模口膨脹的形成------------------------------------------------------------------------------------------------3
1-2-2 模口膨脹的研究現況------------------------------------------------------------------------------------------5
1-3 聚丙烯纖維介紹---------------------------------------------------------------------------------------------------8
1-4 �炰V改性高分子--------------------------------------------------------------------------------------------------10
1-5 二氧化鈦光觸媒簡介--------------------------------------------------------------------------------------------12
1-6 研究動機------------------------------------------------------------------------------------------------------------14
第二章 理論-------------------------------------------------------------------------------------------------------------16
2-1 擬熱可塑型聚乙烯醇--------------------------------------------------------------------------------------------16
2-2 高分子的流動行為------------------------------------------------------------------------------------------------18
2-2-1 流動機理-鏈段的躍遷-----------------------------------------------------------------------------------------18
2-2-2 高分子流動中的彈性形變-----------------------------------------------------------------------------------19
2-2-3 熔體於管道中的流動------------------------------------------------------------------------------------------20
2-3 影響模口膨脹的因素--------------------------------------------------------------------------------------------21
2-4 毛細管黏度計測定原理-----------------------------------------------------------------------------------------26
第三章 實驗-------------------------------------------------------------------------------------------------------------27
3-1 實驗流程------------------------------------------------------------------------------------------------------------27
3-1-1 聚丙烯╱擬熱可塑型聚乙烯醇�炰V纖維製備----------------------------------------------------------27
3-1-2 聚丙烯╱擬熱可塑型聚乙烯醇╱二氧化鈦�炰V纖維製備------------------------------------------28
3-2 實驗設備------------------------------------------------------------------------------------------------------------29
3-3 熔融紡絲條件------------------------------------------------------------------------------------------------------29
3-4 實驗材料------------------------------------------------------------------------------------------------------------30
3-5 紡絲原料製備------------------------------------------------------------------------------------------------------32
3-6 模口膨脹之測定---------------------------------------------------------------------------------------------------33
3-7 樣本配方------------------------------------------------------------------------------------------------------------35
第四章 結果與討論----------------------------------------------------------------------------------------------------36
4-1 聚丙烯纖維的模口膨脹分析-----------------------------------------------------------------------------------36
4-1-1 聚丙烯模口膨脹對剪切速率的依賴性-------------------------------------------------------------------36
4-1-2 聚丙烯模口膨脹對紡絲溫度的依賴性-------------------------------------------------------------------38
4-1-3 聚丙烯模口膨脹對毛細管長度的依賴性----------------------------------------------------------------40
4-1-4 聚丙烯模口膨脹對表觀剪切黏度的依賴性-------------------------------------------------------------42
4-2 紡絲溫度對擬熱可塑型聚乙烯醇模口膨脹的影響------------------------------------------------------44
4-3 聚丙烯╱擬熱可塑型聚乙烯醇�炰V體的模口膨脹探討-----------------------------------------------47
4-3-1 紡絲溫度對聚丙烯╱擬熱可塑型聚乙烯醇�炰V體膨潤比的影響--------------------------------47
4-3-2 �炰V比例對聚丙烯╱擬熱可塑型聚乙烯醇�炰V體膨潤比的影響--------------------------------52
4-4 聚丙烯╱擬熱可塑型聚乙烯醇╱二氧化鈦�炰V體膨潤比探討--------------------------------------56
4-4-1 二氧化鈦對聚丙烯╱擬熱可塑型聚乙烯醇�炰V體膨潤比之影響--------------------------------56
4-4-2 添加二氧化鈦之聚丙烯╱擬熱可塑型聚乙烯醇膨潤比對毛細管長度之依賴性-------------59
第五章 結論-------------------------------------------------------------------------------------------------------------62
建議------------------------------------------------------------------------------------------------------------------------64
參考文獻-----------------------------------------------------------------------------------------------------------------66

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