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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical properties developing at the interface of amorphous miscible polymers, below the glass transition temperature: Time-temperature superposition
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Mechanical properties developing at the interface of amorphous miscible polymers, below the glass transition temperature: Time-temperature superposition

机译：在玻璃化转变温度以下，在非晶态可混溶聚合物的界面处形成的机械性能：时间-温度叠加

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摘要

The bonding of amorphous polystyrene (PS) and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) was conducted over a broad range of time and temperatures, but always below the (bulk) glass transition temperature (Tg). Stress-strain properties developing at the symmetric (PS/PS and PPO/PPO) and asymmetric interfaces (PS/PPO), in a lap-shear joint geometry, were measured at room temperature as a function of contact time and bonding temperature. Master curves of shear strength and modulus, obtained by time-temperature superposition, were constructed over several decades of time. Arrhenius apparent activation energies calculated for shear strength are 99, 81, and 144 kcal/mol for, respectively, PS/PS, PPO/PPO, and PS/PPO interfaces. A higher value of 191 kcal/mol was calculated for the shear modulus at the PS/PS interface, suggesting that the development of the strength and modulus is controlled by different molecular factors, that is, the modulus is controlled by the number of chains across the interface and the strength by the depth of penetration.
机译：无定形聚苯乙烯（PS）和聚（2,6-二甲基-1,4-苯撑氧）（PPO）的键合反应在很宽的时间和温度范围内进行，但始终低于（本体）玻璃化转变温度（Tg） ）。在室温下，测量搭接剪切几何形状中对称（PS / PS和PPO / PPO）和不对称界面（PS / PPO）处产生的应力应变特性，作为接触时间和粘结温度的函数。通过时间-温度叠加获得的抗剪强度和模量主曲线是在几十年的时间内绘制的。对于PS / PS，PPO / PPO和PS / PPO界面，针对剪切强度计算出的Arrhenius表观活化能分别为99、81和144 kcal / mol。对于PS / PS界面处的剪切模量，计算得出的值更高，为191 kcal / mol，这表明强度和模量的发展受不同分子因素控制，即模量受跨链的数量控制。界面和强度取决于渗透深度。

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