论文部分内容阅读
1.本實驗採用了Hoeppler平行板塑性計,按照定應力壓縮形變法的理論,在中温時對國產天然橡膠的本體粘性流動進行了流變學研究。 2.在30-90°與250-1500克/厘米～2的荷重範圍內,測定了貌似本體粘度η_a,內切模數G_i與貌似活化能ΔE_η。所測得的G_i=3.30×10～5達因/厘米～2與ΔE_η=12.7千卡/克分子,在一定温度範圍(50-90°)內爲不依賴於温度的常數。對所測天然橡膠估計所得的粘流鰱段長約30個碳原子。 3.從粘性流動的切變速率dγ/dt依賴於切應力σ的關係中,獲得了Eisenschitz早已衍導出的,但迄未在高聚物的本體粘性流動中獲得例證时非牛頓流動流公式。該式復以Saunder及Treloar的數據重加處理而證實之。 4.從切變速率對貌似本體粘度的影響上,檢驗了Debye-Bueche的理論式。現改用單位體積內彈性鍵段計算推遲時間,τ_1=2.84η_0·[J_e]∞,其中穩態彈性柔數[J_e]∞。係由彈性同復實驗測得。經如此處理後,該式在較低切變速率時筒能與實驗結果相符。 5.若以Eisenschitz式與Debye-Bueche式相結合,則亦可計得內切模數G_i,並藉知貌似本體粘度隨切變速率增高而降低的現象,乃係由於發生內切應變γ_i=σ/G_i之故。
1. In this experiment, Hoeppler parallel plate plastometer was used to study the rheology of bulk viscous flow of domestic natural rubber at medium temperature according to the theory of constant stress compression deformation method. The bulk viscosity η_a, the internal modulus G_i and the apparent activation energy ΔE_η were measured in the range of 30-90 ° and 250-1500 g / cm 2. The measured G_i = 3.30 × 10 ~ 5 dyne / cm ~ 2 and ΔE_η = 12.7 kcal / mol, which are temperature independent constants in a certain temperature range (50-90 °). Estimated natural rubber on the measured sticky silver carp length of about 30 carbon atoms. 3. From the relationship between shear rate dγ / dt of viscous flow and shear stress σ, the non-Newtonian flow equation obtained by Eisenschitz has been obtained but has not been illustrated in the bulk viscous flow of polymer. The complex complex with Saunder and Treloar data re-processing confirmed. 4. Debye-Bueche’s theoretical formula was tested from the effect of shear rate on the apparent bulk viscosity. Now use the elastic volume within the unit volume to calculate the delay time, τ_1 = 2.84η_0 · [J_e] ∞, where the steady elastic number [J_e] ∞. By the elastic test with the same complex. After this treatment, the formula at a lower shear rate tube can be consistent with the experimental results. 5. If we combine Eisenschitz equation with Debye-Bueche equation, we can also calculate the internal modulus G_i, and we can see that the apparent viscosity of the body decreases with increasing shear rate, but due to the occurrence of internal strain γ_i = σ / G_i Therefore.