Shanghai Daoqin Plastics Co., Ltd.

  polymer/macromolecule material in 我们 生 active in use 越 越广泛, can use polymer/macromolecule material basic Knowledge understanding active in to polymer/macromolecule material has phenomenon.

   is what use plastics 绳绑东西会越绑越松

   day active in, 我们经 commonly used plastics 绳绑东西, can 你会发现, use plastics 绳绑东西, 我们越想绑紧, can 不久会发现, plastics very fast good long 似, very 松垮, is again make 劲绑起, can 依然会发现, also 变松, this is is what 呢?

   this need to basic concept --应 force 松弛, force 松弛, is polymer/macromolecule material in 总应变不变 conditions lower, due to Sample internal viscous property 应变随 time growth, make elastic separation amount time reduce, from 而导致回 elastic force time reduce phenomenon.

  我们生 active in use plastics 绳(has chemical 绳) is property polyethylene (PE) or polypropylene (PP) made formed, this category of polymer/macromolecule material is type non crosslinked property polymer/macromolecule, in process in, property polymer/macromolecule by long, surface very 紧, time long, property polymer/macromolecule 链发生 slip 移, this type of slip is can 恢复, 链发生 slip rear, plastics by tensile long, 开始变 不 can 绑紧, false 如此时 again make 劲绑紧, property 链继续发生 slip 移. therefore use plastics 绳绑东西, 绑 越紧 most rear 就会变 越松, 松弛发生 厉害. therefore, has experience use plastics 绳绑东西时, need 绑 太紧, anti property polymer/macromolecule 链发生严 heavy force 松弛.

   that how can this type of phenomenon 呢?

   need use crosslinked polymer/macromolecule material, crosslinked polymer/macromolecule material through crosslinked agent make property polymer/macromolecule formed structure, polymer/macromolecule 网络链 by tensile deformation rear, still can has force 回复. use 橡胶绳绑 话会 large large improvement this type of phenomenon, 如橡皮筋绑就会 good very more, use crosslinked very 完善 东西绑, use 自行车 inner that type of 橡胶绑, basic 不会发生松弛 phenomenon, very 紧, 不信你试试?

  早 upper 起床刷牙挤牙膏- extrusion large

    我们早 upper 起 刷牙挤牙膏时, 发现牙膏 from tube/pipe 口寄出时, good 像突然变 large good more? this is is what causes 呢?

 

   this 里就涉 and to polymer/macromolecule important features --- creep property . polymer/macromolecule creep, creep is material in 恒定载荷 function lower, deformation time increase large process. creep is material separation and structure heavy new adjustment 引起, this process can use time table/sheet 征. outer force 时, material deformation separation or full to 起始状态, this is structure heavy new adjustment phenomenon.

  牙膏 in has a large amount of polymer/macromolecule combined material, wet lubricating agent, material, agent and other and other, this polymer/macromolecule in tube/pipe in is is 呈自然卷曲, in by extrusion tube/pipe that small 位置时, polymer/macromolecule in tube/pipe function lower by 迫发生链 舒展 formed property 状态, in extrusion tube/pipe rear, outer force small 时, polymer/macromolecule in outer force function lower 回自然呈卷曲状态, from make 体积变 large.

   good more 人都喜欢吹泡泡糖, rigid 入嘴 时候, comparison hard, rear 不断 咀嚼 rear 泡泡糖就变 very soft, can 吹出泡泡? this also is is what 呢? this 里我们 also need to polymer/macromolecule material has features ---玻璃化转变.

   generally 说, polymer/macromolecule material in different temperature degree lower has types force 学状态, it is 玻璃态, high elastic and viscous 流态. in temperature degree relatively low 时, material is rigid property solid 体状, and versus 似, in outer force function lower 会发生 non small 形变, 此状态即 is 玻璃态: temperature degree rise high to scope/range rear, material obvious increase, in rear temperature degree 区间形变 versus for stability, 此状态即 is high elastic 态, temperature degree rise high amount also increase large, material 逐渐变 formed viscous property 流体, 此时形变不 can can 恢复, 此状态即 is viscous 流态.

  我们 usually 玻璃态 and high elastic between 转变, is 玻璃化转变, it for 应 转变 temperature degree is 玻璃化转变 temperature degree, or is 玻璃化 temperature degree.

 

  泡泡糖 main/primary formed separation is poly acid ethylene ester, it 玻璃化 temperature degree in 28 degree left right, generally lower low its 玻璃化 temperature degree, its 几乎没 has flow property maintain very good 形态, in 嘴里咀嚼 rear, high its 玻璃化 temperature degree, 泡泡糖发生玻璃化转变, has 玻璃态 toward high elastic 态转变, 呈现出 high elastic 态, therefore 嚼泡泡糖 时候 rigid 开始嚼两 lower is 吹不出泡泡, and other temperature degree rise high rear, soft rear 才行.

  矿泉 water bottle hot water rear, formed white

  生 active in commonly used to water bottle, has 时候, in water bottle hot water, is 会发生一 奇特 phenomenon, transparent water bottle very fast formed white, this also is is what 呢?

 

  判断一 types material is transparent, need in is has for light generate 衍射, and absorption is material 质, structure property comparison good, easy has and dispersion 射, this structure make light can 透, crystallization degree low transparent, 无定形区譬如玻璃 is type property material 质, light can very good 透, transparent property very good.

  矿泉 water bottle is terephthalic acid ester formed, terephthalic acid ester belongs to easy crystallization polymer/macromolecule material, made as water bottle 时, is in high temperature lower as method made 备, rear 经 退火处理, remove crystallization 区域才 tool has optical transparent property. in water bottle in add hot water rear, terephthalic acid ester in high temperature lower separation 子链发生 heavy new orientation 运动, heavy new production crystallization from 而丧失 transparent property.