English
Hujayra kulturalarikichik o'lchamdagi hujayra madaniyatida tez-tez ishlatiladigan sarf materiallari. Hujayra o'sishi sharoitlarini kuzatishni osonlashtirish uchun, odatda, ushbu sarf materiallari uchun shaffofligi yuqori bo'lgan polistirol materiallari tanlanadi. Xo'sh, ushbu materialning xususiyatlari qanday?
Polistirol radikal qo'shilish polimerizatsiyasi orqali stirol monomeridan sintez qilingan polimerga ishora qiladi. Bu rangsiz va shaffof termoplastik bo'lib, quyidagi xususiyatlarga ega:
1. Mexanik xossalari
Polistirol molekulalari va ularning yig'ilgan tuzilishi ularning qattiq va mo'rt materiallar ekanligini aniqlaydi, ular kuchlanish ostida mo'rt sinishni ko'rsatadi.
2. Issiqlik ko'rsatkichi
Mo'rtlashuv harorati taxminan -30 ° C, shisha o'tish harorati 80-105 ° C, erish harorati 140-180 ° C, parchalanish harorati 300 ° C dan yuqori. Issiqlik o'tkazuvchanligi past bo'lib, 0,04 dan 0,15 Vt/(m·K) gacha bo'ladi va u harorat bilan deyarli o'zgarmaydi, shuning uchun u yaxshi issiqlik izolyatsiyasiga ega.
3. Elektr ko'rsatkichlari
Polistirol yaxshi elektr xususiyatlariga ega, hajm qarshiligi va sirt qarshiligi mos ravishda 1016～1018ũ·sm va 1015～1018ũ gacha. Dielektrik yo'qotish tangensi juda past bo'lib, u chastota, atrof-muhit harorati va namlik o'zgarishiga ta'sir qilmaydi. Bu ajoyib izolyatsion materialdir.
4. Optik ishlash
Polistirol mukammal optik xususiyatlarga ega, yorug'lik o'tkazuvchanligi 88% dan 92% gacha va sinishi indeksi 1,59 dan 1,60 gacha. U barcha to'lqin uzunlikdagi ko'rinadigan yorug'likni o'tkazishi mumkin. Shaffof material plastiklarda plexiglass kabi akril polimerlardan keyin ikkinchi o'rinda turadi. .
5. Kimyoviy xossalari
Polistirol turli ishqorlar, tuzlar va suvli eritmalarga chidamli. U pastroq spirtlar va ba'zi kislotalarga (masalan, sulfat kislota, fosfor kislotasi, borik kislotasi, 10% dan 30% gacha bo'lgan xlorid kislotasiga va massa ulushi 1% dan 25% gacha bo'lgan sirka kislotasiga) chidamli. , Formik massa ulushi 1% dan 90% gacha bo'lgan kislota ham barqaror.
Polistirolning yuqoridagi xususiyatlari hujayra madaniyati kolbalari ehtiyojlarini qondira oladi. Bundan tashqari, agar u yopishgan hujayra madaniyati uchun ishlatilsa, hujayralarning yopishish qobiliyatini oshirish uchun shishaning sirtini maxsus o'zgartirish kerak.
The FAI climbed 5.9 percent year-on-year in the first 11 months of 2018, quickening from the 5.7-percent growth in Jan-Oct, the National Bureau of Statistics (NBS) said Friday in an online statement.
The key indicator of investment, dubbed a major growth driver, hit the bottom in August and has since started to rebound steadily.
In the face of emerging economic challenges home and abroad, China has stepped up efforts to stabilize investment, in particular rolling out measures to motivate private investors and channel funds into infrastructure.
Friday's data showed private investment, accounting for more than 60 percent of the total FAI, expanded by a brisk 8.7 percent.
NBS spokesperson Mao Shengyong said funds into weak economic links registered rapid increases as investment in environmental protection and agriculture jumped 42 percent and 12.5 percent respectively, much faster than the average.
In breakdown, investment in high-tech and equipment manufacturing remained vigorous with 16.1-percent and 11.6-percent increases respectively in the first 11 months. Infrastructure investment gained 3.7 percent, staying flat. Investment in property development rose 9.7 percent, also unchanged.