Shanghai Daoqin Plastics Co., Ltd.

crystallization plastics and non crystallization plastics has what is the difference 呢?

先看一 例子:

PET non 晶态时 room temperature lower transparent 状, 玻璃化 temperature degree is 67℃, density is 1.33克每立方 cm.
PET晶态时 is transparent, 玻璃化 temperature degree is 81℃, density is 1.45克每立方 cm.

from upper 述例子 large can 看出一 types material crystallization degree high and crystallization degree low 时, resin plastics very more material property is different. ratio 如:

1, density and resistant solvent agent property: types chemical structure material, crystallization degree different, density different, generally density crystallization degree increase large improve/increase, is crystallization polymer/macromolecule 链排列规整而紧密, generally resistant solvent agent property can improve/increase.

ratio 如: and other 规PP density large random PP density specific how much 呢?

2, tensile strength and impact tough property: generally, tensile strength high poly material crystallization degree increase increase, is what 呢? generally, crystallization polymer ratio non 晶态时 impact tough property low, crystallization make plastics 变脆, and reduce property.

3, elastic property modulus: crystallization degree improve/increase, elastic property modulus increase large （材 material hard? ）晶态 in separation in has 序, has mechanical properties.

crystallization degree 自60％至80％ polyethylene (PE) Sample 知: it elastic property modulus from 230MPa increase 至700MPa. its it surface hardness and 屈服应 force trend 也一样. PTFE, crystallization degree from 60％变至80％时, it elastic property modulus from 560MPa increase 至1120MPa.

4, light rate （ transparent degree ）: crystallization and non crystallization polymer most type difference. crystallization polymer crystallization separation toward property, tool has di phenomenon, can use light micro 镜观察 crystallization structure. its in polymer in crystallization separation and non crystallization separation rate different, interface between dispersion 射, transparent property reduce, generally white, non crystallization polymer tool has relatively high transparency property.

ratio modified separation crystallization PP粒 material, in separation is white, is crystallization separation, is non crystallization transparent.

ratio 如PC, PMMA and PS is non crystallization polymer, transparent rate relatively high.

5, shrinkage rate, warpage and cracking: crystallization degree high, shrinkage large. made parts or Sample separation crystallization degree versus and other, property can non-uniform heavy formed warpage and cracking. therefore for processing molding effect/influence relatively large.

6, surface coarse degree and adhesion property: crystallization make material more add 致密（ density more large ）, surface coarse degree reduce, products is is more light slip 呢? adhesion property is is more 差呢? （材 material surface coarse degree large separation lower 取决于 processing process, and crystallization and 否无关. ）

7, hot property 质: upper 述PET in, can 看出, crystallization degree improve/increase, Tg increase large, 极限 结果 can is Tg increase large and melting point Tm heavy 叠, formed types can is 无Tg crystallization property polymer （无 high elastic 态? ）.

lower is Common crystallization resin and non crystallization property resin （ plastics classification ）, in separation is elastomer.

about/regarding high poly material crystallization, more more color inner 容见: crystallization and polymer structure